WO2023072293A1

WO2023072293A1 - Adaptive control method and apparatus for main oil pressure, device, and storage medium

Info

Publication number: WO2023072293A1
Application number: PCT/CN2022/128846
Authority: WO
Inventors: 张振威; 宁甲奎; 王明玉; 李长洲; 曹龙
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-11-01
Filing date: 2022-11-01
Publication date: 2023-05-04
Also published as: CN114110043A

Abstract

An adaptive control method and apparatus for a main oil pressure, a device, and a storage medium. The control method comprises: determining whether a vehicle enters a steady-state driving state; in response to the fact that the vehicle enters the steady-state driving state, setting a pressure value demanded by a clutch as the actual pressure control value of a main oil path; determining whether an adaptive growth control condition is satisfied; rapidly adjusting, according to a first adaptive pressure safety coefficient and a rapid compensation pressure safety coefficient, the pressure value demanded by the clutch; determining whether a clutch is recovered to a normal state; in response to the fact that the clutch is recovered to the normal state, canceling the rapid compensation pressure safety coefficient, and performing dynamic growth adjustment on the first adaptive pressure safety coefficient; and completing adaptive control.

Description

Main oil pressure adaptive control method, device, equipment and storage medium

This application claims priority to a Chinese patent application with application number 202111281708.5 filed with the China Patent Office on November 1, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of automobile oil pressure control, for example, to a main oil pressure adaptive control method, device, equipment and storage medium.

Background technique

Automatic transmissions generally use the hydraulic system as the transmission actuator. The transmission actuator is a scheme for driving the clutch and synchronizer. The engine drives the mechanical oil pump to provide the oil circuit pressure in the hydraulic system. The pressure of the main oil circuit (that is, the pressure of the oil circuit in the hydraulic system) provides the pressing force for the clutch, and the clutch plate can transmit the engine torque under the action of the pressing force. To realize the transmission of the engine torque, the pressure of the main oil circuit is required to be greater than the torque transmitted by the clutch. A certain safety margin factor is required for the pressure, so as to ensure that the clutch disc is under sufficient pressure for torque transmission when the oil circuit leaks or the pressure changes rapidly. When the synchronizer removes and engages gears, it also needs the pressure of the main oil circuit to provide the execution pressure, so as to ensure the normal execution of removing and engaging gears. The mechanical oil pump is driven by the engine, and the engine speed is constantly changing with different vehicle speeds and gears. The higher the engine speed, the higher the pressure building capacity of the mechanical oil pump, and the less affected by the flow demand of the hydraulic system. The transmission actuator needs stable and continuous main oil circuit pressure. The stable and continuous main oil circuit pressure is achieved by hydraulic pressure. There is an automatic adjustment of the flow regulating valve inside the valve body of the system, so that the pressure of the main oil circuit is only regulated by the pressure solenoid valve of the main oil circuit, so as to avoid being affected by the fluctuation of the engine speed. The critical pressure of the main oil circuit pressure is defined as the pressure value that enables the clutch to be locked and just pressed tightly to avoid slipping. Since most automatic transmissions of hydraulic systems do not install main oil circuit pressure sensors in order to reduce costs, the actual and accurate value of the main oil circuit pressure cannot be obtained. Therefore, in the control method of the main oil circuit pressure, it is usually realized by adding a safety margin coefficient on the basis of the critical pressure, so as to compensate for the inconsistency of the pressure response caused by the mechanical differences of the multiple boxes of the automatic transmission. At the same time, ensure that there is sufficient main oil circuit pressure to meet the pressure requirements of clutch transmission torque pressure and synchronizer de-engagement. The pressure of the main oil circuit is one of the important factors affecting the transmission efficiency of the automatic transmission of the hydraulic system. The increase of the pressure of the main oil circuit will increase the load of the mechanical oil pump and increase the load of the automatic transmission at the same time, resulting in the transmission of the automatic transmission Reduced efficiency. Therefore, the increased safety margin factor is realized on the basis of sacrificing the transmission efficiency of the automatic transmission.

In order to reduce the cost and ensure sufficient main oil circuit pressure demand, it is usually adopted to not install the main oil circuit pressure sensor and increase the fixed safety margin coefficient on the basis of the actual required pressure, so as to ensure the main oil circuit pressure It can work normally in the open-loop control without main oil circuit pressure sensor to ensure that the hydraulic system has sufficient pressure source.

However, the above method involves increasing the pressure safety margin factor. If the increased pressure is too high, the transmission efficiency of the automatic transmission will decrease. If the increased pressure is too low, the pressure in the main oil circuit will be insufficient, which will affect the normal operation of the hydraulic system.

Contents of the invention

The present application provides a main oil pressure self-adaptive control method, device, equipment and storage medium to solve the problem of increasing the value of the pressure safety factor in the related art. If the increased pressure is too high, the transmission efficiency of the automatic transmission will decrease. If it is too low, the pressure of the main oil circuit will be insufficient, which will affect the normal operation of the hydraulic system.

This application adopts the following technical solutions:

In the first aspect, a main oil pressure adaptive control method includes:

Determine whether the vehicle has entered a steady-state driving state;

In response to the vehicle entering a steady-state driving state, setting the value of the clutch demand pressure as the actual pressure control value of the main oil circuit;

Judging whether the adaptive growth control condition is satisfied;

In response to satisfying the adaptive growth control condition, quickly adjusting the value of the clutch demand pressure according to the first adaptive pressure safety factor and the fast compensation pressure safety factor;

Judging whether the clutch returns to normal state;

In response to the clutch returning to a normal state, canceling the rapid compensation pressure safety factor, and performing a dynamic growth adjustment on the first adaptive pressure safety factor;

Complete adaptive control.

In the second aspect, a main oil pressure adaptive control device includes:

The vehicle state judging module is configured to judge whether the vehicle enters a steady-state driving state;

The demand pressure value setting module is configured to set the value of the clutch demand pressure as the actual pressure control value of the main oil circuit in response to the vehicle entering a steady-state driving state;

An adaptive growth control condition judging module is configured to judge whether the adaptive growth control condition is satisfied;

A quick adjustment module, configured to quickly adjust the value of the clutch demand pressure according to the first adaptive pressure safety factor and the quick compensation pressure safety factor in response to satisfying the adaptive growth control condition;

The clutch state judging module is configured to judge whether the clutch returns to a normal state;

A dynamic growth adjustment module, configured to cancel the fast compensation pressure safety factor and perform dynamic growth adjustment on the first adaptive pressure safety factor in response to the clutch returning to a normal state;

An adaptive control module, configured to perform adaptive control.

According to a third aspect, a device includes a memory, a processor, and a computer program stored in the memory and run on the processor. When the processor executes the computer program, the above-mentioned main oil pressure adaptive control method is implemented.

According to a fourth aspect, a storage medium stores a computer program, and the computer program causes the computer to execute the above-mentioned main oil pressure adaptive control method.

Description of drawings

FIG. 1 is a schematic flow chart of a main oil pressure adaptive control method according to Embodiment 1 of the present application;

Fig. 2 is a schematic flow chart of the main oil pressure adaptive control method in Embodiment 2 of the present application;

Fig. 3 is a schematic structural diagram of the main oil pressure adaptive control device according to Embodiment 3 of the present application;

FIG. 4 is a schematic structural diagram of the device in Embodiment 4 of the present application.

Detailed ways

The application will be described in detail below in conjunction with the accompanying drawings and embodiments.

In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

In this application, unless otherwise expressly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

Embodiment one:

This embodiment provides a main oil pressure adaptive control method, see Figure 1, the method includes:

Step S100 , judging whether the vehicle enters a steady-state driving state.

Exemplarily, if the clutch completes oil filling, the clutch starts to transmit torque, and the vehicle gear is fixed, then it is judged that the vehicle enters a steady-state driving state.

It should be noted that in an unsteady driving state, for example, when the automatic transmission changes from one gear to another after the vehicle starts or the gear shifting process is over, the clutch’s transmission torque demand pressure before that is constantly changing , the actual pressure of the clutch is also changing accordingly. At this time, it is not easy to judge whether the current pressure of the main oil circuit has affected the clutch pressure. The clutch demand pressure (that is, the clutch transmission torque demand pressure) refers to the pressing force required by the vehicle to maintain the clutch in the current state, and the actual clutch pressure refers to the pressing force actually provided by the main oil circuit pressure for the clutch.

Step S200 , if the vehicle enters a steady-state driving state, set the value of the clutch demand pressure as the actual pressure control value of the main oil circuit.

It should be noted that, under normal circumstances, the main oil circuit pressure work demand mode is divided into the demand pressure P _{actuation of} gear removal, the demand pressure P _{reverse of} reverse gear, the demand pressure P _hot of the heat mode, and the clutch demand pressure P involved in the first embodiment. _Clutch mode. There are simultaneous demands in these four modes, and the maximum value among the four is selected as the actual pressure control value of the main oil circuit, namely:

P _main = max(P _actuation , P _reverse , P _hot , P _clutch ).

Wherein, the demand pressure P _actuation for removing and engaging gears is defined as follows: the main oil pressure adaptive control device receives the demand pressure value sent from the control module for removing and engaging gears as the demand pressure for the main oil pressure. The pressure value is not 0 when there is a demand action request for gear removal and engagement, and the pressure value is 0 when there is no demand action request for gear removal and engagement. Wherein, the gear-removal control module is responsible for controlling the gear-removal of the vehicle.

The reverse demand pressure P _reverse is defined as follows: the main oil pressure adaptive control device obtains whether the current driver's handle is in the reverse state, if the current driver's handle is in the reverse state, then in the reverse state according to The corresponding reverse gear pressure data stored in the main oil pressure adaptive control device is used as the reverse gear demand pressure, and the reverse gear demand pressure is one of the required values for selecting the actual pressure control value of the main oil circuit; In the reverse gear state, the value of the reverse gear demand pressure is 0.

The thermal mode demand pressure P _hot is defined as follows: the main oil pressure adaptive control device obtains the internal oil temperature state of the automatic transmission and the clutch temperature state, if at least one of the internal oil temperature state and the clutch temperature state of the automatic transmission is overheated state, the corresponding thermal mode pressure data stored in the main oil pressure adaptive control device is used as the thermal mode demand pressure, and the thermal mode demand pressure is one of the required values for selecting the actual pressure control value of the main oil circuit. If the automatic transmission Neither the internal oil temperature state nor the clutch temperature state has an over-temperature state, and the value of the demand pressure in this thermal mode is 0.

For the clutch demand pressure P _clutch , based on the classification of the clutch demand pressure required in the transmission torque of the clutch during the working process of the automatic transmission, the clutch demand pressure P _clutch is divided into two categories: the first category is the demand under the clutch disengagement state The pressure P _clutchOff , the second category is the demand pressure P _clutchOn in the clutch engagement state.

Demand pressure P _clutchOn in the state of clutch engagement: In the state of clutch engagement, the theoretical demand pressure P _{ChReq of the clutch!} = 0, the main oil pressure adaptive control device obtains the current clutch state: if the clutch is in the oil filling state or the clutch shift is in progress, according to the oil filling pressure safety factor value P _clutchFill stored in the main oil pressure adaptive control device, get Clutch theoretical demand pressure P _ChReq! The sum of the filling pressure safety factor value P _clutchFill is taken as the demand pressure P _clutchOn in the clutch engagement state, and the demand pressure P _clutchOn in the above clutch engagement state is taken as one of the required values for selecting the actual pressure control value of the main oil circuit in this state one. It should be noted that this application can be applied to the case of dual clutches. Therefore, when the vehicle enters the steady-state driving state described in step S100, when the first clutch is in a stable clutch torque transmission state, the second clutch It can be in the oil flushing state or the clutch shifting is in progress.

Step S300, judging whether the self-adaptive growth control condition is satisfied.

Exemplarily, step S300 needs to determine whether the deviation between the clutch demand pressure and the clutch actual pressure is greater than the first pressure deviation threshold P _{err_thr1} ; determine whether the change rate of the clutch demand pressure is less than the first preset change rate; determine whether the clutch demand is satisfied at the same time Whether the deviation between the pressure and the clutch actual pressure is greater than the first pressure deviation threshold value P _{err_thr1} and the rate of change of the clutch demand pressure is less than the first preset rate of change, whether the duration T _{err_check} reaches the first preset duration. If the deviation between the clutch demand pressure and the clutch actual pressure is greater than the first pressure deviation threshold P _{err_thr1} and the change rate of the clutch demand pressure is less than the first preset change rate, the two conditions are met at the same time, and the continuous When the time T _{err_check} reaches the first preset duration, the adaptive growth control condition is met.

It should be noted that the actual pressure of the clutch is measured by the clutch pressure sensor. Due to the influence of the accuracy of the clutch pressure sensor, the measured actual pressure of the clutch will have certain slight fluctuations. At the same time, when the clutch demand pressure changes rapidly, the response of the actual clutch pressure There is some pressure response delay.

Exemplarily, if the adaptive growth control condition is not satisfied, the first adaptive pressure safety factor is set as the value of the clutch demand pressure, and at the same time, the first adaptive pressure safety factor is used as the actual pressure control value of the main oil circuit, that is, P _clutchSteady = _Padpt (n). Wherein, the first adaptive pressure safety factor P _adpt (n) is a main oil circuit pressure safety factor stored in the main oil pressure adaptive control device after adaptive control learning, that is, a known parameter. Since it has been determined in step S100 that the vehicle is in a steady-state driving state, the clutch demand pressure at this time P _clutch =P _clutchSteady , where P _clutchSteady represents the clutch demand pressure in a steady state.

In the case that the adaptive increase control condition is not satisfied, the actual pressure control value of the main oil circuit is directly adjusted according to the known first adaptive pressure safety factor.

Step S400 , in response to satisfying the adaptive increase control condition, quickly adjust the value of the clutch demand pressure according to the first adaptive pressure safety factor and the quick compensation pressure safety factor.

In the case of satisfying the adaptive growth control condition, activate the adaptive control of the main oil pressure adaptive control device to the actual pressure control value of the main oil circuit, in S400 the clutch demand pressure P _clutch =P _clutchSteady , when the adaptive control is activated , P _clutchSteady is composed of fast compensation pressure safety factor P _FastPID (n) and first adaptive pressure safety factor P _adpt (n): P _clutchSteady =P _FastPID (n)+P _adpt (n). After the adaptive control is activated, that is, after the adaptive control flag is enabled, P _clutchSteady is dynamically adjusted according to the main oil pressure adaptive control method.

Among them, the fast compensation pressure safety factor P _FastPID (n) is limited by the deviation e(t) between the clutch demand pressure and the clutch actual pressure, the proportional adjustment coefficient K _p and the integral adjustment coefficient K _i of the PI controller, and the integral time t. The quick compensation pressure safety factor is calculated by the following formula:

Among them, P _FastPID (n) represents the fast compensation pressure safety factor, e(t) represents the deviation between the clutch demand pressure and the clutch actual pressure, K _p represents the proportional adjustment coefficient of the proportional-integral PI controller, and K _i represents the integral of the PI controller Adjustment coefficient, t represents the integration time.

Compared with the situation where there is only the first adaptive pressure safety coefficient P _adpt (n) in the clutch demand pressure P _clutch , this embodiment adds a fast compensation pressure safety coefficient P _FastPID (n) to the clutch demand pressure P _clutch , realizing the clutch Rapid compensation of the required pressure, and then increase the actual pressure control value of the main oil circuit to ensure that the main oil circuit pressure has enough pressure to provide a pressure source for the clutch.

It should be noted that there may be other factors that lead to the deviation e(t), such as the inaccurate correspondence between the solenoid valve current and the pressure, and insufficient pressure in the main oil circuit is only one of the factors, so it is necessary to control the fast compensation pressure safety factor P _FastPID ( The maximum magnitude of n) output, and limit the P _FastPID (n). The limit value of the fast compensation pressure safety factor P _FastPID (n) is stored inside the main oil pressure adaptive control device, so as to set a reasonable data range for the fast compensation pressure safety factor.

Step S500, judging whether the clutch returns to a normal state.

Step S600 , if the clutch returns to a normal state, cancel the quick compensation pressure safety factor, and dynamically increase the first adaptive pressure safety factor.

It should be noted that the current fast compensation pressure safety factor P _FastPID (n) starts to work only after the adaptive control flag is triggered and enabled, when the deviation between the clutch demand pressure and the clutch actual pressure is less than or equal to the first pressure deviation threshold After value P _{err_thr1} , the adaptive control flag is triggered to turn off the adaptive control, reverting to the normal control method. Therefore, in order to avoid the above situation and repeatedly perform rapid compensation on the clutch demand pressure, it is necessary to dynamically increase and adjust the first adaptive pressure safety factor, so as to ensure sufficient main oil circuit pressure to provide pressure for the clutch. Wherein, the normal state of the clutch means that the deviation between the clutch demand pressure and the clutch actual pressure is less than or equal to the first pressure deviation threshold.

Exemplarily, step S600 includes adding the first adaptive pressure safety coefficient P _adpt (n) to the adaptive growth step P _fixstep to obtain the second adaptive pressure safety coefficient P _adpt (n2):

P _adpt (n2) = P _adpt (n) + P _fixstep .

Afterwards, the current first adaptive pressure safety coefficient P _adpt (n) is replaced by the second adaptive pressure safety coefficient P _adpt (n2). The adaptively adjusted second adaptive pressure safety coefficient P _adpt (n2) is stored in the main oil pressure adaptive control device, and the original value is updated and replaced.

Add the first adaptive pressure safety factor and the adaptive growth step to determine the second adaptive pressure safety factor, so that the added and updated adaptive pressure safety factor is larger and the pressure of the main oil circuit is higher, ensuring that all system functioning normally.

It can be understood that the second _adaptive pressure safety coefficient P _adpt (n2) is used as the first adaptive pressure safety coefficient P _adpt ( n).

The first adaptive pressure safety factor P _adpt (n) is adjusted through an adaptive growth step. Considering that the first adaptive pressure safety factor P _adpt (n) is a unidirectional growth adjustment, it is necessary to limit the adjusted first 2 The maximum value of the adaptive pressure safety factor. The limit value of P _adpt (n) is stored inside the main oil pressure adaptive control device, and the data range of the second adaptive pressure safety factor is reasonably set according to needs.

It should be noted that the determination steps of the adaptive growth step P _fixstep are:

Obtain the overrun average value P _{err_avr} of the pressure deviation within the detection period T _{err_check} , the overrun average value of the pressure deviation refers to the average value of the deviation between the clutch demand pressure and the actual clutch pressure exceeding the first pressure deviation threshold P _{err_thr1} within the detection period value;

The adaptive growth step P _fixstep is determined according to the pressure deviation exceeding the average value P _{err_avr} . It should be noted that the determination of the adaptive growth step size P _fixstep based on the pressure deviation exceeding the limit average value P _{err_avr} is obtained according to the look-up table, and the following table shows the pressure deviation exceeding the limit average value P _{err_avr} and the adaptive growth step Correspondence table of long P _fixstep .

P _{err_avr}(bar) P _{err_avr} (bar)	0.20.2	0.40.4	0.60.6	0.80.8	1.01.0	1.21.2	1.41.4
P _fixstep(bar) P _fixstep (bar)	00	00	0.40.4	0.60.6	0.80.8	0.80.8	0.80.8

Through the above steps, the adaptive growth step size can be obtained, and then the first adaptive pressure safety factor can be updated.

Step S700, completing the adaptive control.

In the embodiment of the present application, the value of the clutch demand pressure is set as the actual pressure control value of the main oil circuit, so as to meet the clutch working conditions. After activating the adaptive growth control condition, the clutch can be adjusted according to the first adaptive pressure safety factor and the fast compensation pressure safety factor. The value of the demand pressure is quickly adjusted to ensure that there is enough pressure to provide a pressure source for the clutch. When the clutch returns to the normal state, the first self-adaptive pressure safety factor is dynamically increased and adjusted to realize automatic learning, which can be used in the hydraulic system next time. Ensure stable clutch torque transmission requirements during operation, and ensure the normal operation of the system function.

Embodiment two:

This embodiment provides a main oil pressure adaptive control method, see Figure 2, the method includes:

S101. Determine whether the vehicle enters a steady-state driving state.

Exemplarily, if the clutch is filled with oil, the clutch starts to transmit torque, and the gear of the car is fixed, it is judged that the vehicle enters a steady-state driving state.

It should be noted that when the automatic transmission shifts from one gear to another after the vehicle starts or the shifting process is over, the torque demand pressure of the clutch before that is constantly changing, and the actual pressure of the clutch is also changing accordingly. , it is not easy to determine whether the current main oil circuit pressure has affected the clutch pressure.

If the vehicle enters the steady-state driving state, proceed to step S201, and set the value of the clutch demand pressure as the actual pressure control value of the main oil circuit.

It should be noted that, under normal circumstances, the main oil circuit pressure work demand mode is divided into the demand pressure P _{actuation of} gear removal, the demand pressure P _{reverse of} reverse gear, the demand pressure P _hot of the heat mode, and the clutch demand pressure P involved in the first embodiment. _Clutch mode. There are simultaneous demands in these four modes, and the maximum value among the four is selected as the actual pressure control value of the main oil circuit, namely: P _main =max(P _actuation , _Preverse , P _hot , P _clutch ).

Wherein, the demand pressure P _actuation for removing and engaging gears is defined as follows: the main oil pressure adaptive control device receives the demand pressure value sent from the control module for removing and engaging gears as the demand pressure for the main oil pressure. The pressure value is not 0 when there is a demand action request for detachment and hooking, and the pressure value is 0 when there is no demand action request for detachment and hooking.

The reverse demand pressure P _reverse is defined as follows: the main oil pressure adaptive control device obtains whether the current driver's handle is in the reverse state, if the current driver's handle is in the reverse state, then in the reverse state according to The reverse gear pressure data stored in the main oil pressure adaptive control device is used as the reverse gear demand pressure, and the reverse gear demand pressure is one of the required values for selecting the actual pressure control value of the main oil circuit. In the reverse gear state, the value of the reverse gear demand pressure is 0;

The thermal mode demand pressure P _hot is defined as follows: the main oil pressure adaptive control device obtains the internal oil temperature state of the automatic transmission and the clutch temperature state, if at least one of the internal oil temperature state and the clutch temperature state of the automatic transmission is overheated state, the thermal mode pressure data stored in the main oil pressure adaptive control device is used as the thermal mode demand pressure, and the thermal mode demand pressure is one of the required values for selecting the actual pressure control value of the main oil circuit. Neither the oil temperature state nor the clutch temperature state has an over-temperature state, and the value of the demand pressure in this thermal mode is 0.

For the clutch demand pressure P _clutch , the clutch demand pressure P _clutch is divided into two categories based on the different forms of the clutch in the working process of the automatic transmission: the first category is the clutch separation state P _clutchOff , and the second category is the clutch engagement State _PclutchOn .

Demand pressure P _clutchOn in the state of clutch engagement: In the state of clutch engagement, the theoretical demand pressure P _{ChReq of the clutch!} = 0, the main oil pressure adaptive control device obtains the current clutch state: if the clutch is in the oil filling state or the clutch shift is in progress, according to the oil filling pressure safety factor value P _clutchFill stored in the main oil pressure adaptive control device, get Clutch theoretical demand pressure P _ChReq! , and the sum of the filling pressure safety factor value P _clutchFill is taken as the demand pressure P _clutchOn in the clutch engagement state, and the demand pressure P _clutchOn in the above clutch engagement state is taken as the required value for selecting the actual pressure control value of the main oil circuit in this state one.

Step S301, judging whether the self-adaptive growth control condition is satisfied.

Exemplarily, step S301 needs to determine whether the deviation between the clutch demand pressure and the clutch actual pressure is greater than the first pressure deviation threshold P _{err_thr1} ; determine whether the change rate of the clutch demand pressure is less than the first preset change rate; determine whether the clutch demand is satisfied at the same time Whether the deviation between the pressure and the clutch actual pressure is greater than the first pressure deviation threshold value P _{err_thr1} and the rate of change of the clutch demand pressure is less than the first preset rate of change, whether the duration T _{err_check} reaches the first preset duration. If the deviation between the clutch demand pressure and the clutch actual pressure is greater than the first pressure deviation threshold P _{err_thr1} and the change rate of the clutch demand pressure is less than the first preset change rate, the two conditions are met at the same time, and the continuous When the time T _{err_check} reaches the first preset duration, the adaptive growth control condition is satisfied.

Since the demand pressure of the clutch is constantly changing when the automatic transmission starts and shifts gears, the actual pressure of the clutch is also constantly changing. Only when the above conditions are met can it be judged that the current main oil circuit pressure has affected the clutch pressure.

Exemplarily, if the adaptive growth control condition is not satisfied, the first adaptive pressure safety factor is set to the value of the clutch demand pressure in the steady state, and the first adaptive pressure safety factor is used as the actual pressure control of the main oil circuit value, namely:

P _clutchSteady = _Padpt (n).

Wherein, the first adaptive pressure safety factor P _adpt (n) is a main oil circuit pressure safety factor stored in the main oil pressure adaptive control device after adaptive control learning, that is, a known parameter.

After the self-adaptive increase control condition is satisfied, step S401 is performed to quickly adjust the value of the clutch demand pressure according to the first self-adaptive pressure safety factor and the quick compensation pressure safety factor.

When the adaptive control is activated, _P _clutchSteady is composed of two parts _: P _clutchSteady = P _FastPID (n) + P _adpt (n) ). After the adaptive control flag is enabled, it starts to dynamically adjust P _clutchSteady .

Wherein, the fast compensation pressure safety coefficient P _FastPID (n) is limited by the deviation e(t), the proportional adjustment coefficient K _p of the PI controller, the integral adjustment coefficient K _i and the integral time t, and the fast compensation pressure safety coefficient is defined by the following formula Calculate to get:

Increase the fast compensation pressure safety factor P _FastPID (n), realize the rapid compensation of the clutch demand pressure and increase the pressure to ensure that the main oil circuit pressure has enough pressure to provide a pressure source for the clutch.

It should be noted that there may be other factors that lead to the deviation e(t), such as the inaccurate correspondence between the solenoid valve current and the pressure, and insufficient pressure in the main oil circuit is only one of the factors, so it is necessary to control the fast compensation pressure safety factor P _FastPID ( n) Output the maximum magnitude, and perform limiting processing on P _FastPID (n). The limit value of the fast compensation pressure safety factor P _FastPID (n) is stored inside the main oil pressure adaptive control device, so as to set a reasonable data range for the fast compensation pressure safety factor.

Step S501, judging whether the clutch returns to a normal state.

Step S601 , if the clutch returns to a normal state, cancel the quick compensation pressure safety factor, and dynamically increase the first adaptive pressure safety factor.

It should be noted that the current fast compensation pressure safety factor P _FastPID (n) starts to work only after the adaptive control flag is triggered and enabled, when the deviation between the clutch demand pressure and the clutch actual pressure is less than or equal to the first pressure deviation threshold After the value _{Perr_thr1} , the adaptive control flag triggers off adaptive control. Therefore, in order to avoid the above situation and repeatedly perform rapid compensation on the clutch demand pressure, it is necessary to dynamically increase and adjust the first adaptive pressure safety coefficient P _FastPID (n), so as to ensure sufficient main oil circuit pressure to provide pressure for the clutch.

Exemplarily, step S601 includes adding the first adaptive pressure safety coefficient P _adpt (n) to the adaptive growth step P _fixstep to obtain the second adaptive pressure safety coefficient P _adpt (n2):

P _adpt (n2) = P _adpt (n) + P _fixstep .

It can be understood that the second adaptive pressure safety factor P _adpt (n2) is obtained after the current first adaptive pressure safety factor is updated, and is used as the new first adaptive pressure safety factor in the continuing steps P _adpt (n).

The first adaptive pressure safety factor P _adpt (n) is adjusted through an adaptive growth step. Considering that the first adaptive pressure safety factor P _adpt (n) is a unidirectional growth adjustment, it is necessary to limit the adjusted first 2 The maximum value of the adaptive pressure safety factor. The limit value of P _adpt (n) is stored inside the main oil pressure adaptive control device, and the limit value is set reasonably according to needs.

Obtain the over-limit average value P _{err_avr} of the pressure deviation within the detection duration T _{err_check} ;

The adaptive growth step P _fixstep is determined according to the pressure deviation exceeding the limit average value P _{err_avr} .

It should be noted that the determination of the adaptive growth step size P _fixstep based on the pressure deviation exceeding the limit average value P _{err_avr} is obtained according to the look-up table, and the following table shows the pressure deviation exceeding the limit average value P _{err_avr} and the adaptive growth step Correspondence table of long P _fixstep .

Step S701, judging whether the adaptive reduction control condition is satisfied.

It should be noted that repeated execution of steps S101-S601 will cause the first adaptive pressure safety factor to increase continuously, and when it increases to a certain extent, the main oil circuit pressure will be too high, and the self-adaptive adjustment will not be achieved. Purpose.

Exemplarily, step S701 includes:

Judging whether the number of driving cycles reaches the first preset number of times N _{cnt_thr} , wherein the number of driving cycles refers to the number of times step S601 is repeated, that is, the number of times for dynamically increasing and adjusting the first adaptive pressure safety factor;

Judging whether the automatic transmission is working in a fixed gear, whether the vehicle is in a stable situation in gear, and whether the target gear clutch is in a synchronous and non-slip state;

judging whether the rate of change of the clutch demand pressure is less than a second preset rate of change;

Judging whether the duration reaches the second preset duration T _{drop_check} ;

If the number of driving cycles reaches the first preset number and the gearbox is working in a fixed gear, the vehicle is in a stable situation in gear, the target gear clutch is in a synchronous non-slip state, and the rate of change of the clutch demand pressure is less than the second preset rate of change And the duration reaches the second preset duration, it is determined that the adaptive reduction control condition is satisfied.

Step S801 , if the adaptive reduction control condition is satisfied, dynamically reduce the first adaptive pressure safety coefficient P _adpt (n).

The ever-increasing first adaptive pressure safety factor will lead to too high pressure in the main oil circuit, which may lead to failure to achieve the optimal purpose of adaptive adjustment. By reducing the first adaptive pressure safety factor to a reasonable range, the optimal Excellent effect.

Step S801 includes, for example:

Gradually reduce the main oil circuit pressure with a fixed step size P _{drop_step} and record the number of steps down N _{total_cnt} .

The adaptive drop step size P _{drop_adp} is obtained according to the fixed drop step size P _{drop_step} and the number of drop step sizes N _{total_cnt} .

The first adaptive pressure safety factor P _adpt (n) is subtracted from the adaptive drop step size P _{drop_adp} .

It is judged whether the deviation between the actual pressure of the clutch and the required pressure of the clutch exceeds the second pressure deviation threshold P _{err_thr2} .

If the deviation between the actual clutch pressure and the clutch demand pressure exceeds the second pressure deviation threshold P _{err_thr2} , the subtraction result of the first adaptive pressure safety coefficient P _adpt (n) and the adaptive reduction step P _{drop_adp} is determined as the first Three adaptive pressure safety factor P _adpt (n3). The current first adaptive pressure safety coefficient P _adpt (n) is then replaced by the aforementioned third adaptive pressure safety coefficient P _adpt (n3). It can be understood that the third adaptive pressure safety coefficient P _adpt (n3) replaces the current first adaptive pressure safety coefficient P _adpt (n) as the first adaptive pressure safety coefficient P _adpt ( n).

It should be noted that the adaptive drop step size P _{drop_adp} is determined as follows: according to the product of the fixed drop step size P _{drop_step} and the number of drop step sizes N _{total_cnt} , the adaptive drop step size P _{drop_adp} is obtained by referring to the table below.

P _{drop_adp} *N _{total_cnt} (bar)

2

2.5

3

3.5

4

4.5

5.5

P _{drop_adp} (bar)

0

0.2

0.3

0.4

0.5

After step S801 ends, go to step S901 to complete the adaptive control.

In the embodiment of the present application, the value of the clutch demand pressure is set as the actual pressure control value of the main oil circuit to meet the clutch working conditions. After the adaptive growth control condition is activated, the clutch demand can be adjusted according to the first adaptive pressure safety factor and the fast compensation pressure safety factor. The value of the pressure is quickly adjusted to ensure that there is enough pressure to provide a pressure source for the clutch. When the clutch returns to a normal state, the first self-adaptive pressure safety factor is dynamically increased and adjusted to realize automatic learning. Adapt to the pressure safety factor for dynamic reduction and adjustment to avoid excessive pressure in the main oil circuit, so as to ensure stable clutch torque transmission requirements during the next operation and ensure the normal operation of the system function.

Embodiment three:

Referring to accompanying drawing 3, present embodiment provides a kind of main oil pressure self-adaptive control device, comprises vehicle status judging module 10, demand pressure value setting module 20, adaptive growth control condition judging module 30, quick adjustment module 40, clutch state Judgment module 50 , dynamic growth adjustment module 60 and adaptive control module 70 .

Exemplarily, the vehicle state judging module is configured to judge whether the vehicle enters a steady-state driving state; the demand pressure value setting module is configured to set the value of the clutch demand pressure to control the actual pressure of the main oil circuit in response to the vehicle entering a steady-state driving state value; the adaptive growth control condition judging module is set to judge whether the adaptive growth control condition is satisfied; the fast adjustment module is set to respond to the adaptive growth control condition, according to the first adaptive pressure safety factor and the fast compensation pressure safety factor to the clutch The value of the demand pressure is quickly adjusted; the clutch state judging module is set to judge whether the clutch returns to a normal state; the dynamic growth adjustment module is set to respond to the clutch returning to a normal state, cancel the fast compensation pressure safety factor, and adjust the first adaptive pressure The safety factor is dynamically increased and adjusted; the adaptive control module is set to complete the adaptive control.

The device sets the value of the clutch demand pressure as the actual pressure control value of the main oil circuit, so as to meet the clutch working conditions. After the adaptive growth control condition is activated, the clutch demand pressure can be adjusted according to the first adaptive pressure safety factor and the fast compensation pressure safety factor. Quickly adjust the value to ensure that there is enough pressure to provide a pressure source for the clutch. When the clutch returns to a normal state, the first self-adaptive pressure safety factor is adjusted dynamically to realize automatic learning and to ensure a stable pressure in the next operation. The torque transmission requirements of the clutch ensure the normal operation of the system function.

Embodiment four:

Referring to accompanying drawing 4, present embodiment provides a kind of equipment, and this equipment comprises memory 11, processor 21 and the computer program that is stored on memory 11 and can run on processor 21, realizes above-mentioned when processor 21 executes described program. Main oil pressure adaptive control method.

A device is provided in an optional embodiment, and the device includes: a processor 21 and a memory 11 . Wherein, the processor 21 is connected to the memory 11, such as through a bus. Optionally, the device may also include a transceiver. It should be noted that in practical applications, the transceiver is not limited to one, and the structure of the device does not limit the embodiment of the present application.

The processor can be a central processing unit (Central Processing Unit, CPU), a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The processor may implement or execute the various exemplary logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, a combination of at least one microprocessor, a combination of a DSP and a microprocessor, and the like.

A bus may include a path for transferring information between the above-mentioned components. The bus may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA) bus or the like. The bus can be divided into address bus, data bus, control bus and so on.

Memory can be read-only memory (Read Only Memory, ROM) or other types of static storage devices that can store static information and instructions, random access memory (Random Access Memory, RAM) or other types of dynamic memory devices that can store information and instructions The storage device can also be Electrically Erasable Programmable Read Only Memory (EEPROM), Compact Disc Read Only Memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc , Laser Disc, Optical Disc, Digital Versatile Disc, Blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any Other media, but not limited to.

The memory is configured to store the application program code for executing the solution of the present application, and the execution is controlled by the processor. The processor is configured to execute the computer program stored in the memory, so as to realize the contents shown in the foregoing method embodiments.

The device sets the value of the clutch demand pressure as the actual pressure control value of the main oil circuit to meet the clutch working conditions. After the adaptive growth control condition is activated, the clutch demand pressure can be adjusted according to the first adaptive pressure safety factor and the fast compensation pressure safety factor. Quickly adjust the value to ensure that there is enough pressure to provide a pressure source for the clutch. When the clutch returns to a normal state, the first self-adaptive pressure safety factor is dynamically increased and adjusted to realize automatic learning, which can ensure a stable clutch in the next operation. Torque transmission requirements to ensure the normal operation of the system functions.

Embodiment five:

An embodiment of the present application provides a storage medium, and the storage medium stores computer instructions, and the computer program causes the computer to execute the above-mentioned main oil pressure adaptive control method.

The storage medium sets the value of the clutch demand pressure as the actual pressure control value of the main oil circuit to meet the clutch working conditions. After the adaptive growth control condition is activated, the clutch demand pressure can be adjusted according to the first adaptive pressure safety factor and the fast compensation pressure safety factor. Quickly adjust the value to ensure that there is enough pressure to provide a pressure source for the clutch. When the clutch returns to a normal state, the first self-adaptive pressure safety factor is adjusted dynamically to realize automatic learning and to ensure a stable pressure in the next operation. The torque transmission requirements of the clutch ensure the normal operation of the system function.

Claims

A main oil pressure adaptive control method, comprising:

Determine whether the vehicle has entered a steady-state driving state;

In response to the vehicle entering a steady-state driving state, setting the value of the clutch demand pressure as the actual pressure control value of the main oil circuit;

Judging whether the adaptive growth control condition is satisfied;

In response to satisfying the adaptive growth control condition, quickly adjusting the value of the clutch demand pressure according to the first adaptive pressure safety factor and the fast compensation pressure safety factor;

Judging whether the clutch returns to normal state;

In response to the clutch returning to a normal state, canceling the rapid compensation pressure safety factor, and performing a dynamic growth adjustment on the first adaptive pressure safety factor;

Complete adaptive control.
The main oil pressure adaptive control method according to claim 1, wherein said judging whether the adaptive growth control condition is satisfied comprises:

judging whether the deviation between the clutch demand pressure and the clutch actual pressure is greater than a first pressure deviation threshold;

judging whether the rate of change of the clutch demand pressure is less than a first preset rate of change;

judging whether the duration reaches the first preset duration;

In response to satisfying the two conditions that the deviation between the clutch demand pressure and the clutch actual pressure is greater than the first pressure deviation threshold value and the change rate of the clutch demand pressure is less than the first preset change rate and satisfying the two conditions continuously When the time reaches the first preset duration, it is determined that the adaptive growth control condition is satisfied.
The main oil pressure adaptive control method according to claim 1, further comprising: setting the first adaptive pressure safety factor as the value of the clutch demand pressure in response to not satisfying the adaptive increase control condition, and setting The first adaptive pressure safety factor is used as the actual pressure control value of the main oil circuit.
The main oil pressure adaptive control method according to claim 2, wherein the fast compensation pressure safety factor is defined by the deviation, the proportional adjustment coefficient and the integral adjustment coefficient of the proportional-integral PI controller, and the integral time.
The main oil pressure adaptive control method according to claim 4, wherein the fast compensation pressure safety factor is calculated by the following formula:

Among them, P FastPID (n) represents the fast compensation pressure safety factor, e(t) represents the deviation, K p represents the proportional adjustment coefficient of the PI controller, K i represents the integral adjustment coefficient of the PI controller, and t represents the integral time.
The main oil pressure adaptive control method according to claim 5, wherein said dynamically increasing and adjusting the first adaptive pressure safety factor comprises:

adding the first adaptive pressure safety factor to the adaptive growth step size to determine a second adaptive pressure safety factor;

The second adaptive pressure safety factor is replaced by the current first adaptive pressure safety factor.
The main oil pressure adaptive control method according to claim 6, wherein said dynamically increasing and adjusting the first adaptive pressure safety factor further comprises:

Obtain the over-limit average value of the pressure deviation within the detection period;

The adaptive growth step is determined according to the pressure deviation exceeding the average value.
According to the main oil pressure adaptive control method according to any one of claims 1-7, after the value of the clutch demand pressure is set to the actual pressure control value of the main oil circuit, it further includes:

Judging whether the adaptive lowering control condition is satisfied;

dynamically reducing the first adaptive pressure safety factor in response to satisfying an adaptive reducing control condition;

Complete adaptive control.
The main oil pressure adaptive control method according to claim 8, wherein said judging whether the adaptive reduction control condition is satisfied comprises:

Get the number of driving cycles;

judging whether the number of driving cycles reaches a first preset number of times;

Judging whether the automatic transmission is working in a fixed gear, whether the vehicle is in a stable situation in gear, and whether the target gear clutch is in a synchronous and non-slip state;

judging whether the rate of change of the clutch demand pressure is less than a second preset rate of change;

judging whether the duration reaches the second preset duration;

In response to the number of driving cycles reaching a first preset number and the gearbox is working in a fixed gear, the vehicle is in a stable situation in gear, the clutch of the target gear is in a synchronous no-slip state, and the rate of change of clutch demand pressure is less than a second preset If the rate of change is set and the duration reaches the second preset duration, it is determined that the adaptive reduction control condition is met.
The main oil pressure adaptive control method according to claim 8, wherein said dynamically reducing and adjusting the first adaptive pressure safety factor comprises:

Gradually reduce the pressure of the main oil circuit with a fixed reduction step and record the number of reduction steps;

Obtaining an adaptive reduction step size according to the fixed reduction step size and the number of reduction step sizes;

subtracting the first adaptive pressure safety factor from the adaptive reduction step size;

judging whether the deviation between the clutch actual pressure and the clutch demand pressure exceeds a second pressure deviation threshold;

In response to the deviation between the clutch actual pressure and the clutch demand pressure exceeding a second pressure deviation threshold value, the subtraction result of the first adaptive pressure safety factor and the adaptive reduction step size is determined as a third adaptive pressure safety factor;

The current first adaptive pressure safety factor is replaced by the third adaptive pressure safety factor.
A main oil pressure adaptive control device, comprising:

The vehicle state judging module (10) is configured to judge whether the vehicle enters a steady-state driving state;

A demand pressure value setting module (20), configured to set the value of the clutch demand pressure as the actual pressure control value of the main oil circuit in response to the vehicle entering a steady-state driving state;

An adaptive growth control condition judging module (30), configured to judge whether the adaptive growth control condition is satisfied;

A quick adjustment module (40), configured to quickly adjust the value of the clutch demand pressure according to the first adaptive pressure safety factor and the quick compensation pressure safety factor in response to satisfying the adaptive growth control condition;

The clutch state judging module (50) is configured to judge whether the clutch returns to a normal state;

A dynamic increase adjustment module (60), configured to cancel the fast compensation pressure safety factor and perform dynamic increase adjustment on the first adaptive pressure safety factor in response to the clutch returning to a normal state;

An adaptive control module (70), configured to perform adaptive control.
A device comprising a memory (11), a processor (21) and a computer program stored on the memory (11) and operable on the processor (21), when the processor (21) executes the computer program The main oil pressure adaptive control method according to any one of claims 1 to 10 is realized.
A storage medium storing a computer program, the computer program causing the computer to execute the main oil pressure adaptive control method according to any one of claims 1 to 10.