A significant number of modern cars are equipped with a box. Its use is characterized by distinctive features compared with mechanical gearbox. One of these nuances is a trip with an overdrive mode.
What do you need Overdrive
In terms of functionality vehicleOverdrive performs the same function of increased transmission as on the MCPP. Photo: media.ed.edmunds-media.com.
In order to find out the features of this mode, you must first understand its purpose. The main reason for its use is to create gentle working conditions for the operation of the transmission and the engine as a whole, which will help extend the resource such important nodes of the machine. In English transcription, the name indicates a "engine trip".
The main task that designers on it laid is the choice of the optimal style of movement based on torque and vehicle speed. Its use allows you to significantly reduce the load on the mechanical parts of the gearbox and engine. This leads to a significant savings in fuel.
The inclusion of the Overdrive mode allows you to achieve a gear ratio between the transmission shafts in the one to one ratio.
When to use
Inclusion.In order to enable it, you must use the button on the selection lever. It can be located on the top of the handle either on one of the sides, depending on the car model. At the same time, its inclusion is noting the light signal located on the dashboard between the tachometer and the speedometer (odometer). Fit following the following readings:
- the "O / D" icon is on yellow (bright orange) color with the "OFF" prefix - Overdrive is turned off;
- the "O / D" symbol changes the color to green and the "ON" pointer appears - mode is on.
The inclusion of Overdrive can occur on idling Engine. At the same time, the indicator will notify the operation of this mode, but Overdrive itself does not turn on, since the engine is not warm yet.
This paradox is explained constructive features Vehicle, which are equipped with O / D mode. On them, a solenoid is added to the inclusion chain, performing an overdrive control using a thermal controller. At startup, respectively, the motor has not scored the desired temperature. This lies the reason for the disagreement of pointers on dashboard and the actual performance of O / D function.
Situations when using the optionO / D. expedient
The inclusion of Overdrive must be used in areas where movement is assumed at a constant speed during a more or less prolonged period. As a rule, the full potential it shows on country highways.
Although unambiguities in the feasibility of using O / D function, but most of the opinions of motorists suggests that it should always be applied, except when it is better to turn off.
When turned on, a push of a machine that is associated with a torque converter locking is observed.
Prerequisites requiring Overdrive Disable
The main situations where O / D must be disconnected:
- when performing sharp overtaking at a speed of 100 km / h;
- moving around rough terrain;
- by lifting or descent when the engine is needed for braking;
- with a removable ride style.
The last item is devoted to urban conditions. When it was not particularly time to accelerate, and it is already necessary to slow down. Such a traffic situation is the usual situation for urban traffic, where a large number of other participants road, the presence of a significant number of intersections (intersection, overpass, pedestrian crossings). And also high likelihood of traffic jams.
In such conditions, Overdrive is extra and will lead to a rapid failure of the automatic transmission.
Analog Overdrive
For newcomer drivers or having a little driving experience, use Overdrive problematic. Since it is not always possible to understand when it is turned on, and when it is better to refuse this function. Therefore, in the road atmosphere, where solutions should be taken in as soon as possible, such a delay is invalid. At the same time, to regulate the mode, you should partially rely on the automation of the machine and the computer.
Some cars with automatic transmission provides another electronic mode "Kickdown", which means "heel to the floor". Photo: ytimg.com.
It allows an inexplicable driver to adapt faster to the driving features on the automatic box.
Pros and Cons Overdrive
An objective assessment of O / D allows you to distinguish its positive moments and negative sides. As advantages are:
- the ability to save fuel when driving on the highway;
- a small number of revolutions, which reduces the friction force between mechanical parts engine that straightly affects their wear;
- the presence of a separate light bulb, which is exactly able to determine the current status of the motion mode.
The number of minuses that specialists allocate are the same as the advantages. They are determined by the following moments:
- Instructions from the manufacturer, imposes a limit on using this option. It is not categorically recommended when driving in severe and especially difficult conditions.
- The number of gear shifts is more, which is not good for the machine.
- Practically leveled the ability to use the engine to slow down the machine.
The balance of positive and negative when the Overdrive characteristics does not give a unambiguous answer to how often it is necessary to use it. Therefore, the prerogative of choice in this aspect is an individual driver.
Common faults and elimination options
A sign of the emergence of problem situations with the Overdrive mode is a flickering signal of the indicator on the console. It may indicate the presence of the following troubles:
- Defective switching one of the gears;
- Wiring problems;
- Solenoid failure;
- Failures in the onboard computer.
The most common problem is a break in the inclusion circuit. Therefore, it should be visual inspection and try to find the place of breaking the wires. Also check the voltages on the connecting terminals.
In the event of failures in the computer, you should roll back software Or order a flashing from specialists. Photo: a.d-cd.net
Sometimes the problem is eliminated by replacing the Overdrive switch. In rare cases it is possible to find an error yourself and simply delete it from the computer.
The best way out is to appeal to the car service for conducting comprehensive diagnostics Electrical equipment machine.
About other features of the use of Overdrive and its analogues - in this video:
Conclusion
So, inherently O / D - one of the electronic modes of the car aimed at helping the driver in choosing the optimal ride style and increase the timing of the machine service. However, there are a number of specific points that may affect the wear of component engine and transmission. Therefore, the driver needs to develop individual driving tactics with an overdrive, which will extend the resource of the machine as much as possible.
Everyone without exception the car enthusiast is undoubtedly striving to ride, anywhere, was easier, pleasant, as well as the driver's pleasure. It is for this purpose that in modern cars and there are many devices, functions and opportunities.
One of the similar devices known to almost all owners of the car with automatic transmission is the Overdrive function, which provides greater comfort for any trip. The correct understanding and sufficient use of Overdrive can noticeably improve the driving process of the car and facilitate the driver's task. In particular, it concerns long journeys.
1. How Overdrive works
What is an option called unusual for our hearing the word from of English language - "Overdrive"? For all car owners with automatic transmission, Overdrive is a button located on the ACP selector lever. Moreover, the standard state is just inclusion of an overdrive - when the function is turned off on the dashboard, a yellow signal light is ignited with an appropriate inscription (O / D OFF). Overdrive can also disable the operation of the so-called kykdown, that is, a sharp and strong pressing until it stops.
Overdrive is an increase in transmission in vehicles equipped with a box automatic, ratio which is less than a unit - when you turn on this transfer, the slave shaft has more revolutions than the presenter. This is a peculiar analogue of the fifth transmission in machines with a mechanical CP, which is, however, some significant differences.
2. Why turn on and off Overdrive
With Overdrive mode, the car goes to a more economical and convenient gear shift mode. In the process of overclocking the car after switching to the fourth transmission with Overdrive, increased transmission automatically turns on. But, together with this, with the slightest sign of braking, the machine immediately switches to a lower transmission and again to optimal with further acceleration.
In the case when the Overdrive function is turned off, the gear shift occurs a little more difficult - on more high revolutions Engine. At the same time, in the case of clicking on the brake pedal, the automatic transmission operates on the same transmission, and the decrease is in exceptionally upon reaching certain speed and revolutions. When driving with a disconnected overdrive, the possibility of switching to the transmission above the third will be blocked.
That is, based on the whole written above, it can be concluded that Overdrive is necessary, first of all, to improve the characteristics of the movement. Also, when skillful and correctly use this function, more rational use of energy occurs, the gearbox is much less wears and works in a more gentle mode. In addition, a slight decrease in the amount can be attributed to the pluses of using an overdrive exhaust gases During movement, making riding on the car more environmentally and, accordingly, safe for the environment.
3. Overdrive and fuel consumption
There is no significant effect on the total fuel consumption, the use of the Overdrive mode does not provide. Of course, a slightly save on a stuff with competent, timely and appropriate use (or, on the contrary, disabling if necessary) an overdrive is quite possible, but it is not necessary to especially count on it. From this we can conclude that when turned on or when the Overdrive is turned off, there will be no large difference in the amount of fuel spent.
4. Effective use of Overdrive
The efficiency and relevance of the use of Overdrive is for the most part depends on the specific driving conditions - the relief of this section of the road, the workload of the track, the intensity of the road in the conditions of urban ride and other things.
Moreover, any specific instructions or tips on this occasion can not be given, and the operating options for the auto with the included or turned off Overdrive must be developed in a purely personal manner. That is, each driver of the car with and the Overdrive function decides itself for himself when and under what conditions to use them.
But still you can select several cases, when it is wiser to turn off the Overdrive mode, as well as a number of conditions under which it is recommended to be turned on. Overdrive is needed in cases of movement on any roads at a speed below 50 km / h, on protracted long lifts or descents, as well as at a periodically or frequently changing movement pace (for example, on a fairly loaded road by car during travel within the city).
In addition, you can often meet the Council to turn off Overdrive on the track during overtaking at speeds more than 110 km / h. But here it is not so unequivocal, and opinions about the feasibility of refusing to use Overdrive in this case are divided.
Be sure to include Overdrive to improve the comfort of movement and controlling the car, it is recommended for continuous driving on the tracks in cases where the speed is more or less permanent. And also ride with Overdrive advised at high speeds (120 km / h and higher).
Overdrive is the desired and very useful feature, well, for many drivers, even just an indispensable thing. Of course, the motorist should get used to ride with Overdrive, learn all the features provided by this function and find out its advantages. And in order to achieve all this, the experience of driving auto using Overdrive in various conditions.
To understand what is OverDrive mode, consider. It has several modes of operation that you can directly control the "handle", or some modes are controlled using the switches, so to speak "electrically". Based on this, it can be seen that it is possible to sort out the speeds in the automatic box, you can select the selector in manual mode, or the box itself will determine the switching order.
Selector can be controlled by several modes:
- P - (Parking). When transferring the selector to this position, the input shaft is blocked automatic box, that is, the rotation of leading wheels will be in different directions due to the use of differential. It follows that in this mode is contraindicated.
- R - Reverse gear (REAR). Here is no explanation. When translating the lever in this position, a sound buzzer is usually distributed.
- N - Neutral (Neutral). As soon as the selector turns out to be in this position, the blocking of the output shaft "automat" is turned off. With this mode, you need to tow a car or move "rolling", but provided that the speed is further repayment until a complete stop. Switch from N mode D to the move is prohibited due to excessive drives of automatic transmission.
- D - the so-called DRIVE mode. It is used to move forward with the subsequent gear shift in sequential order (1-2-3-4).
There are still 2 or 3 modes, under which it is possible to move forward on respectively two or three transmissions. Typically, these modes include when overcoming complex road sections, as well as for more efficient engine braking.
System of gearbox
- L - It is possible to move only on the lowest (first) transmission. Used when overcoming complex areas of roads, with long descents. On the go to translate the selector from the position D to L it is impossible, that is, it is necessary to start moving from it.
But now the most interesting is electronic modes. One of them and consider in more detail.
Why do you need Overdrive?
On some automatic gearboxes on the selector lever there is a Overdrive mode button. Question - Why do I need OverDrive technology? In the literal translation from English Overdrive means the movement "by engine", speaking by simple language - the increase is used, used optimal option Movement of the car based on the speed of the engine and the speed of movement. For a simple motorist, it will be clearer to sound like this: this mode is similar to direct transmission to when the torque is transmitted from the primary shaft to the secondary directly, bypassing the intermediate shaft (the transfer ratio is 1: 1), usually this is the fifth gear. How to use Overdrive, let's explain from the moment it is turned on with the button:
activation of this feature is the Overdrive button on the automatic transmission. Enabling OverDrive Mode Allows the use of a fourth transmission in the "soft lock" mode of the torque converter, and before that the box during acceleration sequentially moves from the first transfer to the fourth, up to blocking.
Note when the Overdrive button on the automatic transmission is pressed, the indicator does not burn, and the function works.
When this button is disconnected, the indicator lights up on the instrument panel "O / D OFF" yellow or orange.
Moving in mode 1-2-3 gear, the O / D does not show its presence. This mode is used when driving at speed areas, as a result of which the engine noise decreases and, most importantly, the fuel consumption is reduced. Moving along areas with complex road conditions or under load, Overdrive is better disabled.
Video: Overdrive automatic transmission. How to use Overdrive and kick-down
The automatic box having in its asset mode O / D is equipped with a control solenoid, in the circuit of which the thermal sensor is turned on, the mode button and the indicator. That is, on a cold engine, you can enable the mode of O / D, the indicator will show this, but the mode will not turn on.
A little more about riding in this mode. If when Overdrive mode is on, simply release the gas pedal, the box will switch to increased gear, and riding will occur on the average engine speed. Holding the pedal at least a slightly pressed, the transition to increased transmission occurs later, the turnover will be respectively higher. It is clear that when overclocked, you will not understand the difference. This difference will appear when driving in the city in time and traffic jams. For example, when it is necessary to slow down the engine, this mode only interferes - the box goes to the increased and the machine rolls. Therefore, how to use Overdrive? - The question is pure rhetorical.
Answer to a question - Does the OverDrive mode need? - Lies like on the surface. Yes! - Motorists will definitely say, who move the powerively, not fussing, taking care of fuel economy and ecology. Not! - So affirm lovers of a dynamic ride, with frequent use of the Kikdaun regime (gas pedal to the floor). But I would like to travel professionals on the roads, even even with amateur rights. Using this mode on the highways and turning it off in the city and when driving on difficult roads, you will also extend the resource of your automatic gearbox. The controversial questions about Overdrive properly described one of the constructors of the gearboxes: Lying will move long to move, it is thanks to human laziness mechanisms that are still facilitating life.
Many drivers, recreated from mechanics to Avtomat, can not immediately figure out what needs overdrive button on automatic transmission And whether it is necessary to press it at all.
This article will help you to deal with the principle of work of this mode, will prompt, in what cases and how the button can be useful to the driver, and in which overdrive will only lead to the rapid wear of the automatic transdu. So, about everything in order.
In the classic automatic transmission switching boxes, in most cases, a 3-4-speed gear ratio system is used.
At the same time, the second or third stage is straight, i.e. Its gear ratio is equal to one. The third-fourth transmission of the classic "machine" has a gear ratio less than a unit and is called Overdrive (Overdrive, O / D).
Recall the ACAP modes:
- "P" (Parking) Parking mode;
- NEUTRAL. Neutral
- "R" (Reverse). Reverse gear;
- "D" (DRIVE). Progress;
- "D3" or "O / D OFF" - only I, II and III of transmission;
- "2" or "s" - I, II of transmission, or only II-I p. "Winter Mode";
- "1" or "l" only i transmission "SPORT" or "POWER" switching only on high revs;
- "Kickdown" before the stop of the gas pedal;
- "NORM" - economy. Perekl. on medium turnover;
- "PWR" at Maxim. revolutions;
- "SNOW" - to touch with the second transmission;
- "Manual mode" "+" "-".
Overdrive is an increase in the step, that is, when the O / D mode is on, the secondary shaft rotates faster than primary.
Usually the automatic box goes to Overdrive at a speed of more than 50 kilometers per hour, as soon as the driver will weaken pressing the gas pedal. It is believed that the 4-5th speed saves fuel and protects the engine from premature wear.
When the O / D mode is turned off, the box will not switch to the boost level under no circumstances. Include or deactivate the "overdrive" mode The driver can be forcibly forcibly, for this, on the selector lever, the automatic transmission or next to it has the appropriate button with the designation "O / D ON / OFF".
To learn that the OverDrive mode is currently deactivated, the light indication is deactivated - the yellow inscription O / D OFF lights up on the dashboard (the OverDrive Overdrive Light Indication Enabled). According to the logic of things, this means that the default Overdrive must be enabled.
Translate the Overdrive button to the O / D OFF position is recommended for the following maneuvers and circumstances:
- During overtaking on high speed when large and sharp acceleration is required. Immediately after maneuver the overtaking, the automatic transmission manufacturers are recommended to return to the Overdrive mode again;
- When driving off road / snow at low speed;
- During the towing of another car or while driving with a heavy trailer;
- On a protracted lift;
- When driving at a speed of up to 60 kilometers per hour;
- When driving in a complex road atmosphere, requiring a constant reduction / speed set.
Is it worth deactivating overdrive mode in the city?
There are two diametrically opposing convictions on this controversial question, and each of their supporters have their own arguments.
The first believe that Overdrive is not needed in the city, since it is impossible to move long time with a constant speed, in contrast to driving on the highway. So that the machine does not perform a large number of switches, the rapid transmission mode is disconnected, believing that it will also reduce wear of the components and automatic automatic aggregates and save gasoline.
Another part of the machine owners on the machine believes that turn off the mode that boosts the gear ratio of the box is not needed.
Their logic is as follows: in the urban cycle, the automatic transmission is switched more often than on the highway in any case - Overdrive is on or not.
As for the fuel consumption, then the opinion is: once with the same way of driving in the city, the consumption is higher than on the track, then the driving movement is at least just slightly, but will reduce the fuel consumption.
On the question of the feasibility of the Overdrive function in the city of a unambiguous answer.
It all depends on a number of circumstances:
- engine pickup;
- experience and driver travel manners;
- specific conditions of movement, etc.
Disable Overdrive for convenience and saving fuel unambiguously follows when descent on the protracted ridge or serpentine.
In this case, at all it will not be necessary to slow down the car by pressing the brake pedal, because it will trigger the engine braking. At such moments, fuel supply to cylinders is minimal.
Why doesn't the Overdrive button work?
Do not work Overdrive button Maybe for a number of reasons. Like any other mechanism in the car, the OverDrive button on the automatic transmission has its own resource, and may fail in the process of intensive exploitation, simply due to physical wear (which is extremely rare in practice).
The most common cause of the failure of the O / D button is a wiring break or bad contact on the connector running on the button. In this case, it is possible to troubleshoot the problem, disassemble the switching knob and restoring the integrity of the wiring.
If the button itself is all in order, wires and connectors are integers, then the problem may be much more serious. In particular, the OverDrive sensor should be checked and diagnose the automatic transmission itself.
Many modern carsEquipped automatic transmissions, have a mode of the so-called "Overdrive", that is, increased transmission. This mode can be considered a certain 5th transmission analogue in mechanical gearbox.
Usually, the "worker" or nominal mode is the fourth gear. But, when the Overdrive is turned on, more economical gear shift mode is carried out.
That is, when the gas pedal is released during overclocking, the automatic transmission switches to increased transmission, and when pressed, switching to the fourth gear occurs. Further, with the next press of the gas pedal, the automatic transmission switches to the optimal transmission.
When the Overdrive function is disconnected, the switching of the automatic transmission to another transmission occurs on higher motor turnover than in the usual mode. During the braking process, "AUTOMATI" does not switch to lower gear until certain engine speeds are installed.
When it is necessary to turn off Overdrive
Overdrive is recommended to disconnect, performing overtaking on the track, when driving at a speed of 110-130 km / h. After completing the overtaking maneuver, you need to turn on the Overdrive mode again. Overdrive can be turned off itself, when the gas pedal is pressed to the stop (so-called kikdown). Sometimes, when braking, there is a situation where you need to change the engine speed, and then Overdrive may be needed for better engine braking.
- if necessary, sharp acceleration, for example, when performing overtaking at speeds of more than 100 km / h;
- when moving at slow speed, for example, by off-road;
- when moving with a trailer;
When moving in the city, despite the widespread opinion, Overdrive must be included.
Overdrive - how it works
The OverDrive mode is controlled by using the O / D button (ON | OFF), which makes it possible to turn on or off the fourth gear on automatic transmission. On the inclusion of Overdrive mode, signals the light of a yellow signal light located on the instrument panel.
When the Overdrive mode is enabled, during overclocking the automatic transmission, the automatic transmission is sequentially switched from the first to fourth transmission, and then the torque converter is turned on. This moment is accompanied by a random impetus, which some drivers perceive as the inclusion of the fifth transmission, which is incorrect.
When braking, shifting gear down, in reverse sequence occurs.
When the Overdrive mode is turned off, the automatic transmission is blocked on the automatic transmission.
How to use Overdrive in the city
You can consider such a situation as an example of using Overdrive Mode in the city. The machine moves on a continuous closer in the conditions of intensive movement, while the vehicle flow rate is often changing within 40 - 60 km / h.
At the same time, if turned on overdrive, then during accelerations will be sequentially switching transmission 1-2-3-4, also, in some cases, the hydrotransformer will be blocked. In general, frequent periodic gear shifting will quickly get bored, the comfort of the trip will deteriorate, the automatic transfers will quickly wear out.
If now turn off Overdrive, then the operation of the automatic transmission will be completely different. In this interval of switching rates will not be. The movement will become more comfortable, the automatic transmission will be more adequately responding to a gas pedal.
Overdrive and fuel consumption
As for Overdrive, then, according to experts, when driving at high speed, fuel consumption may increase. But, we can say that if you use this regime "with your head", then the difference is if it is, then very insignificant.
How to use Overdrive correctly
One more like a calm, measured, without frequent shift shifts and riding jerks, and others pay more attention to efficiency.
You can advise to include Overdrive in such situations:
- when driving on the highway;
- with a long ride with a constant speed;
- when moving at speeds, above 120 km / h.
Of course, Overdrive is the thing you need, but it is necessary to use it reasonably. Usually, with experience comes the ability to predict various situations on the road, and the ability to enable the necessary automatic transmission mode at the right time.
If someone does not want to "bother" with the use of Overdrive, then you can not do this. This mode can be called the service rather, and not a regular mode of operation of the automatic transmission.
If even the "O / D ON | OFF" button will be so never involved, then the car and the driver will not lose anything, perhaps only that all the possibilities of the machine will not be used.
