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

Abstract

The present invention discloses an intelligent control method for a gear position adaptive recognition function in an automatic transmission D gear mode, the method being as follows: the vehicle state, the engine accelerator pedal state, the engine speed value, and the driver's intention are recorded in an automatic transmission controller; the automatic transmission controller determines the driver's acceleration and deceleration intention, and when the driver steps on the accelerator deeply and releases it, determines to activate the lift foot intelligent shift control; finds the gear position that best meets the driver's needs in the current state from the lift foot intelligent shift control; if the lift foot intelligent shift control has reached the highest gear position decided, or there is an intention to step on the brake to slow down, exits or terminates the intelligent shift control in advance; outputs the gear position required by the driver after the judgment, and if the driver steps on the accelerator again, re-enters the lift foot judgment. The present invention can assist the driver in making a target gear selection and selecting the optimal target gear position.

Description

Technical Field

[0001] The invention relates to an intelligent control method for shifting in the D gear of an automatic transmission. Background Art

[0002] Automatic transmission vehicles have become the mainstream in the market today, and the gear decision of automatic transmission is also an important part of automatic transmission control. In the current form, the D-gear position recognition of mainstream automatic transmissions is mostly performed simply according to the predetermined shift line designed in the transmission control unit, and the shift type is relatively simple. After adding the intelligent control method of the lift foot (gear adaptive recognition) function, the frequency and timing of gear shifts will be adaptively adjusted based on the driver's needs. Summary of the invention

[0003] In order to further improve the driving comfort and responsiveness of the vehicle and meet the diverse needs of the driver, the present invention, based on the existing adaptive control technology, comprehensively considers and provides an intelligent control method for the adaptive gear recognition function in the D gear mode of an automatic transmission.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] An intelligent control method for a gear position adaptive recognition function in an automatic transmission D gear mode comprises the following steps:

[0006] Step 1: The driver drives the vehicle, and the vehicle state, engine accelerator pedal state, engine speed value, and driver intention are recorded in the automatic transmission controller;

[0007] Step 2: The automatic transmission controller determines the driver's acceleration / deceleration intention based on the previous engine accelerator pedal position. When the driver steps on the accelerator pedal deeply and releases it, the lift foot intelligent shift control is activated. At this time, the highest achievable gear is determined based on the vehicle's current speed, gear position and other information, and then the gear position allowed is determined based on the speed and other conditions to execute the shift;

[0008] Step 3: Find the gear that best meets the driver's needs in the current state from the lift foot intelligent shift control;

[0009] Step 4: If the lift foot intelligent shift control has reached the highest gear determined by the decision, or the driver intends to step on the brake to slow down, exit or terminate the intelligent shift control in advance;

[0010] Step 5: Output the gear position required by the driver after the judgment. If the driver steps on the accelerator again, the liftfoot judgment is re-entered.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. The lift foot function intelligent control method of the present invention can assist the driver in selecting a target gear and choosing the optimal target gear.

[0013] 2. The lift foot function intelligent control method of the present invention can be entered or exited at any time according to the driver's driving intention when the driver starts to judge whether to execute the control after stepping on the accelerator pedal.

[0014] 3. During the execution of the lift foot function intelligent control method of the present invention, the driver will continue to determine whether he still has a greater acceleration demand, and will execute a special lift foot control method according to the driver's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The input and output relationship of the intelligent shifting of the lift foot function;

[0016] Figure 2 This is the implementation logic diagram of the automatic transmission lift foot function. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but 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 should be included in the protection scope of the present invention.

[0018] The present invention provides an intelligent control method for the gear position 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 in the lift foot intelligent shift control; 3. Exiting the lift foot intelligent shift control. Figure 1 and Figure 2 As shown, the specific steps are as follows:

[0019] 1. Lift foot function intelligent control activation conditions:

[0020] Its essence is a state machine. The TCU (automatic transmission controller) decides how to perform adaptive control based on the current driving condition signal input.

[0021] (1) Input: vehicle status, engine accelerator pedal status, engine speed value, and driver intention.

[0022] (2) Function:

[0023] 1) Based on the previous engine accelerator pedal position, the driver's acceleration and deceleration intention is judged, that is, whether the driver intends to change the current vehicle speed. When the driver steps on the accelerator and releases it, the lift foot intelligent shift control is judged to be activated. At this time, the highest gear that can be achieved is determined based on the vehicle's current speed, gear position and engine speed information. Then, the gear that can be shifted to is determined based on the engine speed and the current vehicle gear conditions, and the gear shift is performed instead of directly shifting to the highest gear. Preparation is made in advance for the driver's next accelerator shift to maintain sufficient power output.

[0024] 2) Find the gear that best meets the driver's needs in the current state from the lift foot intelligent shift control.

[0025] 3) If the lift foot intelligent shift control has reached the highest gear determined, or the driver intends to brake to slow down, exit or terminate the intelligent shift control in advance.

[0026] (3) Output: Determine the gear position required by the driver.

[0027] 2. Change intention in lift foot intelligent shift control:

[0028] It includes the change intention in intelligent shift control under various working conditions, which can be divided into two categories:

[0029] (1) Stepping on the accelerator changes the gear shift intention

[0030] 1) Driver's accelerator pedal position - the driver's action of pressing the accelerator and the amount of accelerator

[0031] Based on the timing and amount of accelerator pedal pressed by the driver, the system determines the driver's need for acceleration and quickly completes the gear shift.

[0032] 2) Shift delay time - the time difference between the time the driver releases the accelerator to enter the next gear and the time the shift line detects the gear.

[0033] The delay time that meets the driver's expectations is found by looking up the table based on the turbine speed during gear shifting and the current gear position.

[0034] 3) Intelligent control of target gear position - various upshifts (sequential upshifts or skip upshifts) according to the driver's intention

[0035] The target gear required by the driver is determined based on the vehicle's current actual gear and speed.

[0036] (2) Pressing the brakes to change the gear shift intention

[0037] 1) Actual target gear position - the target gear position found based on the accelerator pedal position and current vehicle speed

[0038] The actual target gear position will change after the driver steps on the brake pedal signal.

[0039] 2) Intelligent control of current gear position - the current gear position actually used by the driver under lift foot intelligent control shifting

[0040] The lift foot intelligent shift control will compare the actual target gear with the current gear of the intelligent control. If the actual target gear has been reached, the lift foot control will be exited.

[0041] 3. Lift foot intelligent shift control judgment method:

[0042] (1) Meeting entry requirements

[0043] When the driver steps deeply on the accelerator pedal while driving, the automatic transmission controller will determine that the driver intends to accelerate and overtake. Then, after the driver releases the accelerator pedal, it will identify the rate of change of the front and rear accelerator pedals and control the current gear to prepare for lift foot intelligent shifting.

[0044] (2) Shift delay after entering control

[0045] When the lift foot intelligent shift function is triggered, in order to meet the acceleration when the driver steps on the accelerator pedal again and avoid frequent gear shifting, the lift foot intelligent shift function will control the release of the D gear of the vehicle, and after a certain delay time, the next target gear will be released. The delay time will be slightly different at different gears and different speeds. Generally, the higher the engine speed and the lower the gear, the longer the delay time.

[0046] (3) Press the accelerator again to trigger special control

[0047] After entering the lift foot intelligent shifting function, if the driver presses the accelerator pedal again, it means that the driver needs more power, which means a lower gear for the automatic transmission. At this time, when the transmission controller recognizes that the driver has pressed the accelerator pedal again, the lift foot function will enter a special intelligent control mode, that is, it will determine that the current gear shifting delay time still cannot meet the driver's needs. At this time, the special intelligent control will continue to extend the gear shifting delay time to provide the driver with a longer low gear time, avoiding the problem of insufficient power caused by frequent gear shifting and high gear.

Claims

1. An intelligent control method for the gear adaptive recognition function in the D gear mode of an automatic transmission, characterized in that The method comprises the following steps: Step 1: The driver drives the vehicle, and the vehicle state, engine accelerator pedal state, engine speed value, and driver intention are recorded in the automatic transmission controller; Step 2: The automatic transmission controller determines the driver's acceleration / deceleration intention based on the previous engine accelerator pedal position. When the driver steps on the accelerator pedal deeply and releases it, the lift foot intelligent shift control is activated. At this time, the highest achievable gear is determined based on the vehicle's current speed and gear information, and then the gear that can be shifted is determined based on the speed conditions to execute the shift; Step 3: Find the gear that best meets the driver's needs in the current state from the lift foot intelligent shift control; Step 4: If the lift foot intelligent shift control has reached the highest gear determined, or the driver intends to decelerate by braking, exit or terminate the intelligent shift control in advance; Step 5: Output the gear position required by the driver after the judgment. If the driver steps on the accelerator again, the lift foot judgment is entered again. The judgment method of the lift foot intelligent shift control is as follows: (1) Meeting entry requirements When the driver steps on the accelerator pedal deeply during driving, the automatic transmission controller will determine that the driver intends to accelerate and overtake. After the driver releases the accelerator pedal, it will recognize the change rate of the front and rear accelerator pedals and control the current gear to prepare for lift foot intelligent shifting. (2) Shift delay after entering control When the lift foot smart shift function is triggered, in order to meet the acceleration when the driver steps on the accelerator pedal again and avoid frequent gear shifting, the lift foot smart shift function will control the release of the D gear of the vehicle, and after a certain delay time, the next target gear will be released; (3) Press the accelerator again to trigger special control After entering the lift foot intelligent shifting function, if the driver presses the accelerator pedal again, it means that the driver needs more power, which means a lower gear for the automatic transmission. At this time, when the transmission controller recognizes that the driver has pressed the accelerator pedal again, the lift foot function will enter a special intelligent control mode, that is, it will determine 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 delay time to provide the driver with a longer low gear, avoiding the problem of insufficient power caused by frequent shifting and high gear.

Images