CN117249242A - Intelligent control method for gear self-adaptive recognition function under D gear mode of automatic transmission - Google Patents

Abstract

The invention discloses an intelligent control method for the gear adaptive recognition function in the D gear mode of the automatic transmission. The method is as follows: vehicle status, engine accelerator pedal status, engine speed value, and driver intention are recorded into the automatic transmission controller; The automatic transmission controller determines the driver's intention to accelerate and decelerate. When the driver deeply depresses the accelerator and releases it, it determines to activate the lift foot intelligent shift control; it finds the gear that best meets the driver's needs in the current state from the lift foot intelligent shift control. position; if the lift foot intelligent gear shift control has reached the highest gear determined by the decision, or there is an intention to apply the brakes to slow down, exit or terminate the intelligent gear shift control in advance; output the gear required by the driver after judgment, if the driver Depress the accelerator again and the lift foot judgment will be entered again. The invention can assist the driver in selecting the target gear and selecting the optimal target gear.

Description

Intelligent control method of gear adaptive recognition function in automatic transmission D gear mode

Technical field

The invention relates to an intelligent control method for downshifting in D gear of an automatic transmission.

Background technique

Automatic transmission vehicles have become the mainstream of the market today, and automatic transmission gear decision-making is also an important part of automatic transmission control. In the current form, most of the D-gear recognition of mainstream automatic transmissions simply executes the shift according to the predetermined shift line designed in the transmission control unit, and the shift type is relatively single. After adding the lift foot (gear adaptive recognition) function intelligent control method, the frequency and timing of gear shifts will be adaptively adjusted based on the driver's needs.

Contents of the invention

In order to further improve the driving comfort and responsiveness of the vehicle and meet the diverse needs of the driver, the present invention takes comprehensive consideration based on the existing adaptive control technology and provides an automatic transmission gear automatic transmission in the D gear mode. Adapt to the intelligent control method of recognition function.

The purpose of the present invention is achieved through the following technical solutions:

An intelligent control method for gear adaptive recognition function in automatic transmission D gear mode, including the following steps:

Step 1. The driver drives the vehicle, and the vehicle status, engine accelerator pedal status, engine speed value, and driver intention are recorded into the automatic transmission controller;

Step 2: The automatic transmission controller determines the driver's intention to accelerate or decelerate based on the previous engine accelerator pedal position. When the driver deeply depresses the accelerator and releases the pedal, it determines to activate the lift foot intelligent shift control. At this time, according to the vehicle's current speed and gear Information such as gear position determines the highest gear that can be reached, and then determines the gear that is allowed to be shifted to based on conditions such as speed and executes the shift;

Step 3. Find the gear that best meets the driver's needs in the current state from the lift foot intelligent shifting control;

Step 4. If the lift foot intelligent shift control has reached the highest gear determined by the decision, or the driver has the intention of applying the brakes to slow down, exit or terminate the intelligent shift control in advance;

Step 5: Output the gear required by the driver after judgment. If the driver steps on the accelerator again, the liftfoot judgment will be re-entered.

Compared with the existing technology, the present invention has the following advantages:

1. The intelligent control method of the lift foot function of the present invention can assist the driver in selecting the target gear and selecting the optimal target gear.

2. The lift foot function intelligent control method of the present invention can enter or exit at any time according to the driver's driving intention when the driver starts to judge whether to execute control after depressing the accelerator pedal.

3. During the execution process, the intelligent control method of the lift foot function of the present invention will continue to judge whether the driver still needs greater acceleration, and at the same time, a special lift foot control method will be executed according to the driver's operation.

Description of drawings

Figure 1 shows the input and output relationship of the intelligent shifting of the lift foot function;

Figure 2 is the logic diagram for realizing the lift foot function of the automatic transmission.

Detailed ways

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the present invention. within the scope of protection.

The invention provides an intelligent control method for the gear adaptive recognition function in the D gear mode of an automatic transmission, which includes three components: 1. Entering the lift foot intelligent shift control; 2. Changing the intention during the lift foot intelligent shift control. ;3. If foot intelligent shift control exits. As shown in Figure 1 and Figure 2, the specific steps are as follows:

1. Lift foot function intelligent control opening conditions:

Its essence is a state machine, and the TCU (automatic transmission controller) decides how to perform adaptive control based on the current driving condition signal input.

(1) Input: vehicle status, engine accelerator pedal status, engine speed value, driver intention.

(2) Function:

1) Based on the previous engine accelerator pedal position, determine the driver's intention to accelerate or decelerate, that is, whether the driver has the intention to change the current vehicle speed. When the driver depresses the accelerator deeply and releases it, the lift foot intelligent shift control is judged to be activated. At this time, the highest gear that can be reached is determined based on the vehicle's current speed, gear position and engine speed information, and then based on the engine speed, current vehicle gear position The condition determines the gear that is allowed to be shifted to and performs the shift without directly shifting to the highest gear, so as to prepare in advance for the driver's next step on the accelerator to shift gears and maintain sufficient power output.

2) Find the gear that best meets the driver's needs in the current state from the lift foot intelligent shift control.

3) If the lift foot intelligent shift control has reached the highest gear determined by the decision, or the driver has the intention of applying the brakes to slow down, exit or terminate the intelligent shift control in advance.

(3) Output: Determine the gear required by the rear driver.

2. Change intention in lift foot intelligent shift control:

It includes the intention to change in intelligent shift control under various working conditions, and is mainly divided into two categories:

(1) Step on the accelerator to change the intention of shifting gears

1) Driver's accelerator pedal position - the driver's action of depressing the accelerator and the size of the accelerator

Based on the timing and magnitude of the driver's depression of the accelerator, the driver's demand for acceleration is determined and the gear shift is completed quickly.

2) Shift delay time - the difference between the time the driver releases the accelerator to enter the next gear and the time the gear shift line detects the gear.

According to the turbine speed during gear shifting and the current gear lookup table, the delay time that meets the driver's expectations is found.

3) Intelligent control of the target gear - realize various upshifts according to the driver's intention (sequential upshift or jump upshift)

The target gear required by the driver is determined based on the current actual gear and speed of the vehicle.

(2) Apply the brakes to change the intention of shifting gears

1) Actual target gear - the target gear found based on the accelerator pedal position and current vehicle speed

The actual target gear detected after the driver depresses the brake pedal signal will change accordingly.

2) Intelligent control of the current gear - the current gear actually used by the driver under lift foot intelligent control shifting

The lift foot intelligent shift control will compare the actual target gear with the current gear under intelligent control. If the actual target gear has been reached, the lift foot control will exit.

3. Lift foot intelligent shift control judgment method:

(1) Meet the entry conditions

When the driver presses the accelerator pedal deeply while driving, the automatic transmission controller will determine that the driver has the intention of accelerating to overtake, etc., and then after the driver releases the accelerator pedal, it will recognize the changes in the front and rear accelerator pedals. rate, the automatic transmission controller will control the current gear and prepare to enter lift foot intelligent shifting.

(2) Shift delay after entering control

When the lift foot smart shift is triggered, in order to meet the acceleration when the driver presses the accelerator pedal again and avoid frequent gear shifts, the lift foot smart shift function will control the release of the D gear. After a certain period of time, the lift foot smart shift function will control the release of the D gear. After the delay time, the next target gear is released. The delay time will be slightly different in different gears and different speeds. Generally speaking, the higher the engine speed, the longer the delay time when the gear is lower.

(3) Press the accelerator again to trigger the special control

After entering the lift foot intelligent shifting function, if the driver presses the accelerator pedal again at this time, it means that the driver needs more power, which is a lower gear for the automatic transmission. At this time, when After the transmission controller recognizes that the driver presses the accelerator pedal again, the lift foot function will enter a special intelligent control mode, that is, it determines that the current shift delay time still cannot meet the driver's needs. At this time, the special intelligent control will continue to extend the shift. The delay time provides the driver with a longer low gear to avoid the problem of insufficient power caused by frequent gear changes and high gears.

Claims (2)

1. The intelligent control method for the gear self-adaptive recognition function in the D gear mode of the automatic transmission is characterized by comprising the following steps of:

step 1, a driver drives a vehicle, and the vehicle state, the state of an engine accelerator pedal, the engine rotation speed value and the driver intention are recorded into an automatic transmission controller;

step 2: the automatic transmission controller judges the acceleration and deceleration intention of a driver according to the position of a previous engine accelerator pedal, when the driver deeply steps on the accelerator and releases the accelerator, the automatic transmission controller judges to activate lift foot intelligent gear shifting control, at the moment, the highest gear which can be reached is decided according to the current speed and gear information of the vehicle, and then the gear which is allowed to be shifted is decided according to the rotating speed condition to execute gear shifting;

step 3, finding out the gear which most meets the requirement of a driver in the current state from the lift foot intelligent gear shifting control;

step 4, if the lift foot intelligent gear shifting control reaches the highest gear determined, or the driver has the intention of stepping on the brake to reduce the speed, the intelligent gear shifting control is exited or terminated in advance;

and 5, outputting the gear required by the driver after the judgment, and if the driver steps on the accelerator again, re-entering the lift foot judgment.

2. The intelligent control method for the gear self-adaptive recognition function in the D-range mode of the automatic transmission according to claim 1, wherein the judgment mode of the lift foot intelligent gear shift control is as follows:

(1) Meeting the entry condition

When a driver deeply steps on an accelerator pedal in the driving process, the automatic gearbox controller judges that the driver has an acceleration overtaking intention, and then recognizes the change rate of the front accelerator pedal and the rear accelerator pedal after the driver releases the accelerator pedal, and the automatic gearbox controller controls the current gear to prepare for entering a lift foot intelligent gear shift;

(2) Shift delay after access control

After the lift foot intelligent gear shifting is triggered, in order to meet the acceleration when the driver presses the accelerator pedal again and avoid frequent gear shifting, the lift foot intelligent gear shifting function can control the release of the gear of the D-gear vehicle, and after a certain delay time, the next target gear is released;

(3) Triggering special control by stepping on accelerator again

After entering the lift foot intelligent gear shifting function, if the driver again appears the operation of stepping on the accelerator pedal, this time indicates that the driver needs bigger power, be lower gear to automatic transmission, after the transmission controller discerns that the driver steps on the accelerator pedal again this time, lift foot function can enter special intelligent control mode, judge that current gear shifting delay time still can not satisfy driver's demand, special intelligent control can continue to prolong gear shifting delay time this time, provide longer low gear for the driver, avoid frequent gear shifting and the power shortage problem that high gear brought.