阅读说明：本技术 一种自动挡车型的发动机转速控制方法及系统 (Engine rotating speed control method and system of automatic transmission type ) 是由 何勇 胡显力 王承钻 刘登峰 于 2021-08-31 设计创作，主要内容包括：本发明提供一种自动挡车型的发动机转速控制方法及系统,其技术方案是先根据输入的相关信号进行逻辑条件判断,判断是否满足转速控制的边界输入条件,并对边界输入条件进行合理设定,精确的判断出车辆运行在滑行解锁的工况,并在满足和不满足条件的情况下进行分别控制,满足条件后是以怠速控制策略进行控制,使实际转速能够很好的跟随目标转速,达到转速精确控制的目的,这样就可以有效解滑行过程中再次踩油门的冲击及提升加速响应。(The invention provides an engine rotating speed control method and system of an automatic transmission vehicle type, which adopts the technical scheme that logic condition judgment is carried out according to input related signals, whether boundary input conditions of rotating speed control are met or not is judged, the boundary input conditions are reasonably set, the working condition that the vehicle runs in a sliding unlocking mode is accurately judged, the vehicle is respectively controlled under the conditions that the boundary input conditions are met and the boundary input conditions are not met, and then an idling control strategy is used for controlling after the conditions are met, so that the actual rotating speed can well follow the target rotating speed, the aim of accurately controlling the rotating speed is fulfilled, and the impact of stepping on an accelerator again in the sliding process and the acceleration response are effectively solved.)

1. An engine speed control method of an automatic transmission type is used for controlling a transmission after unlocking when a vehicle slides, and is characterized by comprising the following steps:

s10, acquiring control related signals;

s20, performing logic condition judgment based on the signal input, and judging whether the boundary input condition for entering the rotational speed control is satisfied, includes:

judging whether the current engine rotating speed is less than the preset engine rotating speed or not, and determining the state of a rotating speed control working condition zone bit according to the judgment result;

judging whether the signal of the transmission clutch is in a preset state or not, and determining the state of a shift condition flag bit according to the judgment result;

judging whether the accelerator pedal signal is smaller than a preset opening degree or not, and determining the state of an accelerator flag bit according to a judgment result;

judging whether the gear signal is greater than a preset gear, and determining the state of a gear zone bit according to a judgment result;

judging whether the gear lever signal is a preset gear lever signal or not, and determining whether the gear lever signal is in a D zone bit state or not according to a judgment result;

judging whether the pressure of the brake master cylinder is smaller than a calibration threshold value or not, and determining the state of a pressure zone bit of the brake master cylinder according to a judgment result;

when the boundary conditions are judged to be met, the step enters S30, and if any condition is not met, the step enters S50;

s30, the engine control unit receives the turbine speed + delta of the transmission as the target speed to control the speed, wherein delta is obtained by calibrating according to different gears, different speeds and working conditions, and has good performance when meeting TIP IN;

s40, entering an idle speed control strategy, and accurately controlling according to different working conditions and rotating speed deviations to enable the actual rotating speed to follow the target rotating speed so as to achieve accurate rotating speed control;

and S50, the rotating speed following control module does not carry out assignment, and the engine rotating speed control enters a normal rotating speed control mode.

2. The engine speed control method of an automatic transmission type according to claim 1, wherein the control signal includes: the control system comprises an accelerator pedal signal, a brake master cylinder pressure, an engine rotating speed, a clutch state signal, a gear shifting state signal locking and unlocking device, a gear shifting lever actual position signal and a transmission turbine signal.

3. An engine speed control system of an automatic transmission type for controlling a transmission after unlocking when a vehicle is coasting, comprising:

a signal acquisition unit for acquiring a control-related signal;

the judging unit is used for judging logic conditions according to signal input and judging whether boundary input conditions of rotating speed control are met, and comprises:

judging whether the current engine rotating speed is less than the preset engine rotating speed or not, and determining the state of a rotating speed control working condition zone bit according to the judgment result;

judging whether the signal of the transmission clutch is in a preset state or not, and determining the state of a shift condition flag bit according to the judgment result;

judging whether the accelerator pedal signal is smaller than a preset opening degree or not, and determining the state of an accelerator flag bit according to a judgment result;

judging whether the gear signal is greater than a preset gear, and determining the state of a gear zone bit according to a judgment result;

judging whether the gear lever signal is a preset gear lever signal or not, and determining whether the gear lever signal is in a D zone bit state or not according to a judgment result;

judging whether the pressure of the brake master cylinder is smaller than a calibration threshold value or not, and determining the state of a pressure zone bit of the brake master cylinder according to a judgment result;

the engine control unit is used for receiving the turbine rotating speed + delta of the transmission as a target rotating speed to control the rotating speed after judging that the boundary conditions are met, wherein the delta is obtained by calibrating according to different gears, different rotating speeds and working conditions and has good performance when meeting TIP IN;

the first speed control unit is used for entering an idle speed control strategy, and the idle speed control module adjusts according to different working conditions and requirements PID so that the actual speed follows the target speed to achieve accurate control of the speed;

and the second rotating speed control unit is used for enabling the rotating speed following control module not to be assigned, and controlling the rotating speed of the engine to enter a normal rotating speed control mode.

Technical Field

The invention relates to the technical field of vehicle engine control, in particular to an engine rotating speed control technology of an automatic transmission type.

Background

Patent document CN201610576654.8 discloses a shift control method for a DCT vehicle that adjusts the time required to change gears by clutch control in the DCT. The shift control method includes: controlling the release-side clutch so that the release-side clutch is partially disengaged by the controller when a gear shift is started in a state where the accelerator pedal is not depressed; performing a synchronous control by partially applying the apply-side clutch torque in an initial stage of synchronization such that the engine speed follows and is synchronized with the apply-side input shaft speed, and partially applying the release-side clutch torque in a final stage of synchronization; and after executing the synchronization control, executing a torque transfer control such that the apply-side clutch is engaged when the release-side clutch is disengaged.

Patent document CN201710374294.8 discloses a manual transmission type gear shift control method, device and control system, wherein the method comprises the following steps: acquiring a clutch bottom dead center signal; judging whether the clutch is in a bottom dead center or not according to the clutch bottom dead center signal; and if so, controlling the rotation speed of the engine to be synchronous with the rotation speed of the input shaft of the transmission. This technical scheme can eliminate the impact of the process of shifting, can alleviate driver's burden, promotes and drives experience.

Patent document CN201911210559.6 discloses a method, a device, a storage medium and a device for controlling the shift speed of an automobile, wherein the method comprises the following steps: the method comprises the steps of obtaining vehicle running state information of a target vehicle, filtering the vehicle running state information to obtain the target vehicle running state information, determining a gear shifting rotating speed control identification bit state according to the target vehicle running state information, determining a rotating speed control strategy according to the gear shifting rotating speed control identification bit state, and controlling the automobile gear shifting rotating speed according to the rotating speed control strategy. The gear shifting speed identification position state is determined by analyzing the vehicle operation information of the target vehicle, and the gear shifting speed of the vehicle is controlled according to the gear shifting identification position state, so that the engine speed can be controlled during gear shifting, and the engine noise is reduced.

In summary, none of the conventional vehicle engine control systems relates to engine speed control after a transmission is unlocked during coasting of an AT (automatic transmission) vehicle. When an AT vehicle enters a sliding state when an accelerator-released vehicle enters a specific working condition, the transmission is unlocked AT the moment, the transmission and the engine are in a disengaged state, the rotating speed of the engine rapidly drops AT the moment, a large rotating speed difference exists between the rotating speed of the engine and the rotating speed of the turbine, the accelerator is stepped on again AT the moment, impact and sound can be caused due to gaps between hardware, and meanwhile, certain response delay exists due to the fact that the rotating speed is low, the torque rises slowly under the working condition, as shown in figure 1.

Disclosure of Invention

The invention aims to provide a method and a system for controlling the rotating speed of an engine after a transmission is unlocked IN the process of sliding of an automatic transmission vehicle, so as to improve the response of TIP IN (sudden accelerator stepping) IN the process of sliding, eliminate or weaken impact and improve the satisfaction degree of customers.

The technical scheme of the invention is as follows:

an engine speed control method of an automatic transmission type is used for controlling a transmission after unlocking when a vehicle coasts, and comprises the following steps:

and S10, obtaining signals related to the rotation speed control, wherein the control signals comprise: the control system comprises an accelerator pedal signal, a brake master cylinder pressure, an engine rotating speed, a clutch state signal, a gear shifting state signal locking and unlocking device, a gear shifting lever actual position signal, a transmission turbine signal and the like.

S20, according to the signal input, logic condition judgment is carried out, whether the boundary input condition of the rotating speed control is met is judged, and the method comprises the following steps:

and judging whether the current engine rotating speed is less than the preset engine rotating speed or not, and determining the state of the rotating speed control working condition zone bit according to the judgment result.

And judging whether the transmission clutch signal is in a preset state or not, and determining the state of the shift condition zone bit according to the judgment result.

And judging whether the accelerator pedal signal is smaller than a preset opening degree or not, and determining the state of an accelerator flag bit according to a judgment result.

And judging whether the gear signal is larger than a preset gear, and determining the state of a gear zone bit according to a judgment result.

And judging whether the gear lever signal is a preset gear lever signal or not, and determining whether the gear lever signal is in a D zone bit state or not according to a judgment result.

And judging whether the pressure of the brake master cylinder is smaller than a calibration threshold value or not, and determining the state of a pressure zone bit of the brake master cylinder according to a judgment result.

When the boundary condition is judged to be satisfied, the step enters S30, and if the boundary condition is not satisfied, the step enters S50;

s30, the engine control unit receives the turbine speed + delta of the transmission as the target speed to control the speed, wherein delta is obtained by calibrating according to different gears, different speeds and working conditions, and has good performance when meeting TIP IN;

and S40, entering an idle speed control strategy, and calibrating PID regulation by an idle speed control module according to different working conditions and requirements, so that the actual rotating speed can well follow the target rotating speed, and the rotating speed is accurately controlled.

And S50, the rotating speed following control module does not carry out assignment, and the engine rotating speed control enters a normal rotating speed control mode.

The invention adopts the technical proposal, because the logic condition judgment is firstly carried out according to the signals of the accelerator pedal, the pressure of the brake master cylinder, the rotating speed of the engine, the state signals of the clutch, the locking and unlocking of the gear shifting state signal, the actual position signals of the gear shifting lever, the turbine signals of the transmission and the like, whether the boundary input condition of the rotating speed control is met is judged, and the boundary input conditions are reasonably set, so that the working condition that the vehicle runs in sliding unlocking can be accurately judged, and respectively controlling the conditions which are met and not met, and controlling the idling control strategy after the conditions are met, so that the actual rotating speed (the rotating speed of the engine) can well follow the target rotating speed (the rotating speed of the turbine) to achieve the aim of accurately controlling the rotating speed, when the condition is not met, the control is carried out according to the normal rotating speed control mode of the engine, so that the impact of stepping on the accelerator again in the sliding process can be effectively relieved, and the acceleration response is improved.

Drawings

FIG. 1 is a schematic illustration of the engine speed and turbine speed differential after coast unlock;

FIG. 2 is a schematic illustration of signal transmission;

FIG. 3 is a flow chart of a method of speed control;

fig. 4 is a schematic diagram of the rotational speed control after the scheme of the invention is used.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

The present embodiment describes in detail the engine speed control method after the transmission is unlocked during coasting for automatic transmission, and referring to fig. 3, the logic steps are as follows:

and S10, acquiring signals, namely acquiring signals related to the sliding rotation speed control through a sensor and other controllers in a CAN (controller area network) communication mode and the like for boundary input conditions of the rotation speed control, wherein the transmission relationship of the signals is shown in the figure 2:

s1, acquiring the actual opening degree of the accelerator according to the accelerator pedal signal;

s2-obtaining a brake master cylinder pressure signal through CAN communication;

s4, acquiring an engine speed signal through an engine speed sensor;

s5, acquiring state signals of a transmission control clutch state, gear shifting and the like through CAN communication, and the actual position of a gear shifting lever;

s6 obtains the transmission turbine signal via CAN.

These signals are transmitted to a rotational speed control device, here in particular an engine control unit, S3.

S20, logic condition judgment is made based on the signal input, namely, whether the entering condition of the rotation speed control is satisfied, and these judgments include:

and judging whether the current engine rotating speed is less than a preset engine rotating speed or not, and determining the state of a rotating speed control working condition zone bit according to a judgment result.

And judging whether the transmission clutch signal is in a preset state or not, and determining the state of a shift working condition zone bit according to a judgment result.

And judging whether the accelerator pedal signal is smaller than a preset opening degree or not, and determining the state of an accelerator flag bit according to a judgment result.

And judging whether the gear signal is larger than a preset gear, and determining the state of a gear zone bit according to a judgment result.

And judging whether the gear lever signal is a preset gear lever signal or not, and determining whether the gear lever signal is in a D zone bit state or not according to a judgment result.

And judging whether the pressure of the brake master cylinder is smaller than a calibration threshold value or not, and determining the state of a pressure zone bit of the brake master cylinder according to a judgment result.

If the above determination condition is satisfied, the process proceeds to S30, and if not, the process proceeds to S50.

In this embodiment, in step S20, the vehicle operation state information of the target vehicle is obtained, the vehicle operation state information is filtered to obtain the target vehicle operation state information, and the shift condition flag state is determined according to the current engine speed, the accelerator pedal signal, the clutch signal and/or the shift lever signal. Therefore, the working condition that the vehicle runs IN the sliding unlocking mode can be accurately judged, so that the rotating speed can be controlled IN the TIP IN working condition, and the user experience is improved.

And S30, after the boundary condition is judged to be satisfied, the engine control unit receives the turbine speed + delta of the transmission as a target speed to control the speed, wherein the delta is obtained by carrying out detailed calibration according to different gears, different speeds and working conditions, so that the performance is good when the TIP IN is satisfied.

And S40, entering an idle speed control strategy, referring to FIG. 4, calibrating PID regulation according to different working conditions and requirements through an idle speed control module, so that the actual rotating speed (engine rotating speed) can well follow the target rotating speed (turbine rotating speed), and the aim of accurately controlling the rotating speed is fulfilled.

And S50, when the boundary judgment condition is not met, the rotating speed following control module does not carry out assignment, and the engine control unit controls the rotating speed of the engine to enter a normal rotating speed control mode.

In a further embodiment, a control system for controlling the engine speed of an automatic transmission of the type after unlocking the transmission during coasting implements the method described in the previous embodiment, comprising the following units:

and a signal acquisition unit for acquiring the control-related signal.

And a judging unit, configured to perform logic condition judgment according to the signal input, and judge whether a boundary input condition for speed control is satisfied, where the condition is as described in the previous embodiment.

And the engine control unit is used for receiving the turbine rotating speed + delta of the transmission as a target rotating speed to control the rotating speed after judging that the boundary conditions are met, wherein the delta is obtained by calibrating according to different gears, different rotating speeds and working conditions, and has good performance when meeting TIP IN.

The first speed control unit is used for entering an idle speed control strategy, and the idle speed control module adjusts according to different working conditions and requirements PID so that the actual speed follows the target speed to achieve accurate control of the speed;

and the second rotating speed control unit is used for enabling the rotating speed following control module not to be assigned when the boundary judgment condition is not met, and controlling the rotating speed of the engine to enter a normal rotating speed control mode.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.