CN-116221359-B - Control method and device for hydraulic torque converter

CN116221359BCN 116221359 BCN116221359 BCN 116221359BCN-116221359-B

Abstract

The application provides a control method and a control device for a hydraulic torque converter, which belong to the field of automobile gearbox control, and when current vehicle parameters meet preset conditions, particularly when the current vehicle speed is within a preset vehicle speed range, a clutch in the hydraulic torque converter is controlled to be switched to a sliding friction state, namely a half-linkage state, in the state, an engine can stop oil injection, and meanwhile, the engine can be prevented from flameout due to the fact that the wheel speed of the wheel is low and the engine is dragged to flameout, or the engine is disconnected with the wheel, in summary, the engine is kept to cut off oil on the basis of avoiding flameout of the engine, and the oil cut-off time is prolonged, so that the oil consumption is further reduced.

Inventors

LIU ZHENGYANG
TANG WEIYI
HE ZHIGUO
ZHOU ZHONGGUANG

Assignees

奇瑞汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230324

Claims (4)

1. A torque converter control method, characterized in that the method comprises: acquiring current vehicle parameters, wherein the current vehicle parameters comprise the current vehicle speed; judging whether the current vehicle parameters meet preset conditions or not, wherein the preset conditions comprise that the current vehicle speed is in a preset vehicle speed interval; when the current vehicle parameter is judged to meet the preset condition, controlling a clutch in the hydraulic torque converter to be switched to a sliding friction state, wherein when the clutch is switched to the sliding friction state, the engine keeps fuel cut and does not flameout, The preset conditions include a first sub-condition, a second sub-condition and a third sub-condition, when the current vehicle parameter simultaneously satisfies the first sub-condition, the second sub-condition and the third sub-condition, the current vehicle parameter satisfies the preset conditions, wherein the current vehicle parameter further includes a sliding friction identification bit, a gearbox controller state, a driving mode, a sliding friction accumulation time and a gearbox oil temperature, and when all of the following conditions are simultaneously satisfied, the current vehicle parameter is indicated to satisfy the first sub-condition: the current vehicle speed is in the preset vehicle speed interval, the sliding friction identification position is a preset value, the control state of the gearbox is fault-free, the driving mode is not a movement mode, the sliding friction accumulation time is less than a preset time, the oil temperature of the gearbox is in a preset temperature range, The current vehicle parameter further includes a joint self-learning identification bit, an engine speed change rate, an engine torque, an accelerator pedal opening, an engine and turbine speed difference, and a current state of a clutch of the torque converter, and when the current vehicle parameter satisfies the first sub-condition and further satisfies all of the following conditions simultaneously, it is indicated that the current vehicle parameter satisfies the second sub-condition: The self-learning identification position of the combination point is the preset numerical value, the engine speed is in a preset speed range, the engine speed change rate is lower than a preset change rate range, the engine torque is in a preset torque range, the accelerator pedal opening is smaller than a preset opening, the difference between the engine and the turbine speed is smaller than a preset speed difference, and the current state of the clutch is a combination state, The current vehicle parameter further includes an execution flag that indicates that the current vehicle parameter satisfies the third sub-condition when the current vehicle parameter satisfies the first sub-condition and the second sub-condition, and further satisfies all of the following conditions simultaneously: the execution identification bit is the preset value, and the current vehicle speed is in the preset vehicle speed interval.
2. The method of claim 1, wherein after the controlling the clutch in the torque converter to shift to the slip friction state, the method further comprises: determining a control current according to the current vehicle parameters; And controlling an electromagnetic valve in the clutch of the hydraulic torque converter in real time according to the control current so as to enable the clutch to maintain the sliding friction state.
3. A torque converter control apparatus, characterized by comprising: An acquisition module configured to acquire current vehicle parameters including a current vehicle speed; The judging module is configured to judge whether the current vehicle parameter meets a preset condition, wherein the preset condition comprises that the current vehicle speed is in a preset vehicle speed interval; a control module configured to control a clutch in the torque converter to switch to a slip friction state when it is determined that the current vehicle parameter satisfies the preset condition, wherein when the clutch is switched to the slip friction state, an engine remains fuel cut and does not stall, The preset conditions include a first sub-condition, a second sub-condition and a third sub-condition, when the current vehicle parameter simultaneously satisfies the first sub-condition, the second sub-condition and the third sub-condition, the current vehicle parameter satisfies the preset conditions, wherein the current vehicle parameter further includes a sliding friction identification bit, a gearbox controller state, a driving mode, a sliding friction accumulation time and a gearbox oil temperature, and when all of the following conditions are simultaneously satisfied, the current vehicle parameter is indicated to satisfy the first sub-condition: the current vehicle speed is in the preset vehicle speed interval, the sliding friction identification position is a preset value, the control state of the gearbox is fault-free, the driving mode is not a movement mode, the sliding friction accumulation time is less than a preset time, the oil temperature of the gearbox is in a preset temperature range, The current vehicle parameter further includes a joint self-learning identification bit, an engine speed change rate, an engine torque, an accelerator pedal opening, an engine and turbine speed difference, and a current state of a clutch of the torque converter, and when the current vehicle parameter satisfies the first sub-condition and further satisfies all of the following conditions simultaneously, it is indicated that the current vehicle parameter satisfies the second sub-condition: The self-learning identification position of the combination point is the preset numerical value, the engine speed is in a preset speed range, the engine speed change rate is lower than a preset change rate range, the engine torque is in a preset torque range, the accelerator pedal opening is smaller than a preset opening, the difference between the engine and the turbine speed is smaller than a preset speed difference, and the current state of the clutch is a combination state, The current vehicle parameter further includes an execution flag that indicates that the current vehicle parameter satisfies the third sub-condition when the current vehicle parameter satisfies the first sub-condition and the second sub-condition, and further satisfies all of the following conditions simultaneously: the execution identification bit is the preset value, and the current vehicle speed is in the preset vehicle speed interval.
4. The apparatus of claim 3, wherein the control module is further configured to determine a control current based on the current vehicle parameter after the clutch in the control torque converter is switched to a slip friction state, and to control a solenoid valve in the clutch of the torque converter in real time based on the control current to maintain the clutch in the slip friction state.

Description

Control method and device for hydraulic torque converter Technical Field The application relates to the field of automobile gearbox control, in particular to a hydraulic torque converter control method and device. Background With the progress of manufacturing industry and the rise of people's consumption level, the popularity of automobiles is also growing rapidly. Consumers are beginning to have a higher pursuit for automobiles, for example, hopes that vehicles will have lower fuel consumption. And with the national emphasis on non-renewable resources, increasingly stringent regulations have been put on restricting emissions and fuel consumption of automobiles. In order to reduce the fuel consumption of automobiles, various manufacturers have started to develop various corresponding technologies, such as low-speed oil-breaking technologies and the like. The existing low-speed oil-breaking technology generally controls the engine to stop oil injection when the vehicle is in a sliding state and the driver does not press the accelerator pedal, keeps the clutch of the hydraulic torque converter closed, and reversely drives the engine to continue to operate by means of rotation of wheels so as to reduce oil consumption. However, when the vehicle slides slowly to a certain speed, in order to avoid the flameout of the engine caused by the too low speed of the vehicle, the clutch of the hydraulic torque converter needs to be disconnected, and after the disconnection, the connection between the engine and the wheels is disconnected, the rotation of the wheels can not continue to drive the engine to run in the reverse direction, so that the fuel injection needs to be recovered by the engine to avoid flameout, and the fuel consumption can not be further reduced. Disclosure of Invention In view of the above, the application provides a control method and a control device for a hydraulic torque converter, which can prolong the oil-cut time of an engine and further reduce the oil consumption. Specifically, the method comprises the following technical scheme: in a first aspect, the present application provides a torque converter control method, the method comprising: The method comprises the steps of obtaining current vehicle parameters, wherein the current vehicle parameters comprise current vehicle speed. And judging whether the current vehicle parameters meet preset conditions or not, wherein the preset conditions comprise that the current vehicle speed is in a preset vehicle speed interval. And when the current vehicle parameters are judged to meet the preset conditions, controlling the clutch in the hydraulic torque converter to be switched to a sliding friction state. Optionally, the preset conditions include a first sub-condition, a second sub-condition, and a third sub-condition, when the current vehicle parameter satisfies the first sub-condition, the second sub-condition, and the third sub-condition at the same time, the current vehicle parameter satisfies the preset conditions, wherein the current vehicle parameter further includes a sliding friction identification bit, a gearbox controller state, a driving mode, a sliding friction accumulation time, and a gearbox oil temperature, and when all of the following conditions are satisfied at the same time, it is indicated that the current vehicle parameter satisfies the first sub-condition: The current vehicle speed is in a preset vehicle speed interval, the sliding friction identification position is a preset value, the control state of the gearbox is fault-free, the driving mode is not a movement mode, the sliding friction accumulation time is smaller than the preset time, and the oil temperature of the gearbox is in a preset temperature range. Optionally, the current vehicle parameter further includes a joint self-learning identification bit, an engine speed change rate, an engine torque, an accelerator pedal opening, an engine-to-turbine speed difference, and a current state of a clutch of the torque converter, and when the current vehicle parameter satisfies the first sub-condition and further satisfies all of the following conditions simultaneously, the current vehicle parameter is indicated to satisfy the second sub-condition: The self-learning identification position of the combination point is a preset value, the engine speed is in a preset speed range, the engine speed change rate is lower than a preset change rate range, the engine torque is in a preset torque range, the opening of an accelerator pedal is smaller than the preset opening, the difference between the engine and the turbine speed is smaller than the preset speed difference, and the current state of the clutch is the combination state. Optionally, the current vehicle parameter further includes an execution flag indicating that the current vehicle parameter satisfies a third sub-condition when the current vehicle parameter satisfies the first sub-condition and the second sub-condition, and fur