CN-121993511-A - Load torque budget-based combined pressure correction method and system, vehicle-mounted terminal and vehicle

CN121993511ACN 121993511 ACN121993511 ACN 121993511ACN-121993511-A

Abstract

The invention relates to the field of clutch control, in particular to a combined pressure correction method, a combined pressure correction system, a vehicle-mounted terminal and a vehicle based on load torque budget, wherein the method comprises the steps of judging the type of the current working condition according to the power-on state of a controller, running direction change information and a clutch trigger signal; and according to the budget torque value and the wet clutch friction torque model, obtaining a required clutch control pressure value, and replacing a basic pressure value output by a clutch combination characteristic curve with the clutch control pressure value to carry out correction control on the combination pressure. The invention reduces control lag, improves the accuracy of torque prediction and the degree of pressure matching, effectively inhibits impact shake in the starting/reversing/gear shifting process, avoids excessive sliding friction or rough combination of the clutch, prolongs the service life of the clutch, reduces the operation difficulty, and improves the operation precision and comfort level.

Inventors

WANG DONGMING
GUO YUAN
LIU LEI

Assignees

山拖农机装备有限公司
山东五征集团有限公司

Dates

Publication Date: 20260508
Application Date: 20251229

Claims (10)

1. A combined pressure correction method based on a load torque budget, comprising the steps of: Judging the current working condition type according to the power-on state of the controller, the running direction change information and the clutch trigger signal, wherein the working condition type comprises an initial power-on working condition, a running direction change working condition, a gear shifting working condition and a half-clutch working condition; The method comprises the steps of according to the type of a current working condition, calling and executing an adaptive load torque budget strategy to generate a budget torque value, wherein the load torque budget strategy adaptive to an initial power-on working condition comprises the steps of carrying out torque value budget according to torque information of a previous driving cycle, the load torque budget strategy adaptive to a travelling direction change working condition comprises the step of carrying out torque value budget according to torque information before the travelling direction change and a target direction speed ratio, the load torque budget strategy adaptive to a gear shifting working condition comprises the step of carrying out torque value budget according to torque information before clutch action, and the load torque budget strategy adaptive to a half clutch working condition comprises the step of carrying out torque value budget according to torque information before clutch action and a target gear speed ratio; And obtaining a required clutch control pressure value according to the budget torque value and the wet clutch friction torque model, and replacing the basic pressure value output by the clutch combination characteristic curve with the clutch control pressure value to carry out correction control on the combination pressure.
2. The method for correcting the combined pressure based on the load torque budget according to claim 1, wherein the judging the current working condition type according to the power-on state of the controller, the running direction change information and the clutch trigger signal specifically comprises: collecting a power-on zone bit of a controller, a current running direction signal output by a gearbox and a digital or analog signal sent by a clutch trigger device; if the controller power-on flag bit indicates that the power-on is the initial power-on and no effective non-neutral running direction signal is recorded after the initial power-on, judging that the current working condition is the initial power-on working condition; otherwise, continuously comparing the current value of the driving direction signal with the previous control period value; If the current value is not neutral and is different from the previous control period value, judging that the running direction is changed, and converting the current working condition into a running direction changing working condition; otherwise, detecting whether the clutch trigger signal reaches an effective threshold value; If the clutch trigger signal is valid and the driving direction signal is unchanged before and after the trigger, judging whether the gear selection signal is changed, if the gear signal is changed, judging the gear shifting working condition, and if the gear signal is not changed, judging the half-clutch working condition.
3. The method for load torque budget based combined pressure correction according to claim 1, wherein the load torque budget strategy adapted to the initial power-on state budgets torque values according to torque information of a previous driving cycle, in particular comprising: In the last driving cycle, when detecting the flameout signal of the engine or the power-down instruction of the controller, judging that the driving cycle is finished, before finishing, continuously collecting and buffering the torque percentage data of the engine under the stable working condition by the control system, wherein the collecting time is as follows ; Will be The torque percentage data sequence collected in the duration is processed by arithmetic average to obtain a representative torque value And writing the value to a non-volatile memory of the controller; Reading a representative torque value from non-volatile memory after an initial power-on condition of a current driving cycle is triggered Will (i) be Directly used as the budget torque value of the current initial power-on working condition 。
4. The method for combining pressure correction based on load torque budget according to claim 1, wherein the load torque budget strategy adapted to the traveling direction changing condition budgets torque values according to the torque information before the traveling direction changing and the target direction speed ratio, specifically comprising: Monitoring a driving direction signal in real time, and judging that a direction change event occurs when a signal value is switched from a forward gear to a reverse gear, from the reverse gear to the forward gear, or from a neutral gear to the forward gear or the reverse gear; extracting from the circular buffer, in response to the occurrence of the direction change event, a time preceding the occurrence of the direction change event Internal recorded torque percentage data of the stable working condition of the engine; Calculating an arithmetic mean of the extracted engine steady-state torque percentage data as a base engine torque percentage value before the direction change ; Determining target transmission path according to target driving direction signal, inquiring equivalent transmission speed ratio correspondent to current engine speed range and target direction from preset speed ratio mapping table ; Multiplying the basic torque value by the equivalent speed ratio to obtain the budget torque value required to be transmitted by the target direction clutch I.e. 。
5. The method for combining pressure correction based on load torque budget according to claim 1, wherein the load torque budget strategy adapted to the gear shift condition performs torque value budget according to the torque information before clutch action, and specifically comprises: From the moment of clutch triggering, go back forward Extracting engine torque percentage data over the period from the cyclical buffer; Filtering and averaging the extracted data to obtain a torque percentage value representing the pre-shift load state And then the obtained Directly used as the budget torque value under the semi-clutch working condition 。
6. The method for pressure correction based on load torque budget according to claim 5, wherein the load torque budget strategy adapted to the half-clutch condition budgets a torque value according to the torque information before clutch action and the target gear speed ratio, and specifically comprising: determining a target gear according to a message of a gearbox controller or a signal of a gear sensor, and inquiring a transmission speed ratio under the gear ; Percent torque value Speed ratio to transmission Multiplying to obtain the budget torque value required to be transmitted by the target gear clutch I.e. 。
7. The method of load torque budget based combined pressure correction according to claim 1, further comprising the steps of: real-time grade angle provided by vehicle attitude sensor Calculating a gradient compensation coefficient Wherein The gradient influence weight coefficient; According to the rate of change of engine speed Calculating dynamic compensation coefficient Wherein In order for the weight coefficient to be a dynamic response, For the rated engine speed, sgn () is a sign function; invoking nominal drag torque from a preset database based on the type of work tool currently engaged As a fixed compensation amount ; The method comprises the steps that budget torque values of an initial power-on working condition, a travelling direction changing working condition, a gear shifting working condition and a half-clutch working condition, which are obtained according to a load torque budget strategy, are respectively recorded as a first budget torque value, a second budget torque value, a third budget torque value and a fourth budget torque value; Calculating initial power-on condition ; Calculating the working condition of changing the travelling direction ; Calculating gear shifting conditions ; Calculating the semi-clutch working condition 。
8. A combined pressure correction system based on a load torque budget, comprising: the working condition judging module is used for judging the type of the current working condition according to the power-on state of the controller, the running direction change information and the clutch trigger signal, wherein the type of the working condition comprises an initial power-on working condition, a running direction change working condition, a gear shifting working condition and a half-clutch working condition; The budget torque value generation module is used for calling and executing an adaptive load torque budget strategy according to the current working condition type so as to generate a budget torque value; the load torque budget strategy is adaptive to a gear shifting working condition, namely, the torque value budget is carried out according to the torque information of the previous driving cycle, the load torque budget strategy is adaptive to a traveling direction changing working condition, namely, the torque value budget is carried out according to the torque information before the traveling direction is changed and the target direction speed ratio; and the pressure correction control module is used for obtaining a required clutch control pressure value according to the budget torque value and the wet clutch friction torque model, and replacing the basic pressure value output by the clutch combination characteristic curve with the clutch control pressure value so as to carry out correction control on the combination pressure.
9. A vehicle-mounted terminal, characterized by comprising: a memory for storing a combined pressure correction program based on a load torque budget; A processor for implementing the steps of the load torque budget based binding pressure correction method according to any of the claims 1 to 7 when executing said load torque budget based binding pressure correction program.
10. A vehicle characterized by being provided with the in-vehicle terminal according to claim 9.

Description

Load torque budget-based combined pressure correction method and system, vehicle-mounted terminal and vehicle Technical Field The invention relates to the field of clutch control, in particular to a combined pressure correction method and system based on load torque budget, a vehicle-mounted terminal and a vehicle. Background Because the running and working environments of the tractor are more, the working conditions are more complicated, and the combination and separation control of the wet clutch in starting and shifting between running depends on the load, the stability of the whole process can be ensured, so how to judge the load condition and the working condition type of the tractor, and providing accurate build-up pressure value becomes the key of clutch control correction. The traditional control method mostly depends on a single and pre-calibrated clutch combined pressure curve, or carries out real-time fine adjustment based on signals such as simple accelerator opening, engine speed and the like. The operation environment of the tractor is complex and changeable, and the system load difference is huge under different working conditions such as heavy load ploughing, hill start, soft ground running and the like. By adopting a fixed or reactive control strategy, the clutch can not be quickly and stably combined under various working conditions, so that obvious impact is often caused when starting or reversing, or the clutch is overheated and abnormally worn due to long-time sliding friction. The related art mostly belongs to feedback or feedforward-feedback compound control of "feel and rear-acting", namely, after a clutch starts a combining process, pressure is adjusted by monitoring changes of parameters such as engine speed, output shaft speed and the like. This approach has inherent hysteresis and is unable to provide accurate pressure values that match the current actual load demands at the beginning of clutch engagement. Especially, when power is switched (F/R switching) during running, the load state is changed instantaneously, the response delay of the system is very easy to cause the steering to be blocked or the power to be interrupted, and the driving experience and the working efficiency are seriously affected. Disclosure of Invention In order to solve the problems, the invention provides a combined pressure correction method, a combined pressure correction system, a vehicle-mounted terminal and a vehicle based on load torque budget, which are used for reducing control hysteresis, improving torque prediction accuracy and pressure matching degree, effectively inhibiting impact shake in starting/reversing/shifting processes, avoiding excessive sliding friction or rough combination of a clutch, prolonging service life of the clutch, reducing operation difficulty and improving operation precision and comfort level. In a first aspect, the present invention provides a combined pressure correction method based on load torque budget, including the following steps: Judging the current working condition type according to the power-on state of the controller, the running direction change information and the clutch trigger signal, wherein the working condition type comprises an initial power-on working condition, a running direction change working condition, a gear shifting working condition and a half-clutch working condition; The method comprises the steps of according to the type of a current working condition, calling and executing an adaptive load torque budget strategy to generate a budget torque value, wherein the load torque budget strategy adaptive to an initial power-on working condition comprises the steps of carrying out torque value budget according to torque information of a previous driving cycle, the load torque budget strategy adaptive to a travelling direction change working condition comprises the step of carrying out torque value budget according to torque information before the travelling direction change and a target direction speed ratio, the load torque budget strategy adaptive to a gear shifting working condition comprises the step of carrying out torque value budget according to torque information before clutch action, and the load torque budget strategy adaptive to a half clutch working condition comprises the step of carrying out torque value budget according to torque information before clutch action and a target gear speed ratio; And obtaining a required clutch control pressure value according to the budget torque value and the wet clutch friction torque model, and replacing the basic pressure value output by the clutch combination characteristic curve with the clutch control pressure value to carry out correction control on the combination pressure. In a second aspect, the present invention provides a combined pressure correction system based on a load torque budget, including: the working condition judging module is used for judging the type of the current working cond