[0052] Example
[0053] See figure 1 , figure 1 This is a flow chart of a method for controlling shifting of a hydraulic automatic transmission according to an embodiment of the present invention. Such as figure 1 As shown, the method includes:
[0054] Step S101: detecting the shift signal of the automatic transmission;
[0055] Specifically, the shift signal of the automatic transmission from the automatic transmission cooperative control system is detected.
[0056] Step S102: When the shift signal is detected, compare the current shifting condition with the preset different shifting conditions to obtain a preset shifting condition that matches the current shifting condition ;
[0057] Specifically, the preset different shifting conditions include: a powered upshift operating condition, a powered downshift operating condition, an unpowered upshift operating condition, and an unpowered downshift operating condition. Powered upshift operating conditions refer to the operating conditions where the throttle is increased and upshifts as the vehicle speed increases; powered downshift operating conditions refer to the operating conditions where the vehicle speed is increased quickly and downshifts before the vehicle speed increases; non-powered upshift operating conditions, Refers to the process of upshifting after releasing the throttle, which generally occurs after the power downshifting condition; the unpowered downshifting condition, refers to the downshifting condition without the accelerator, as the vehicle speed decreases.
[0058] When the shift signal is detected, the current shifting conditions are compared with different preset shifting conditions to obtain a certain preset shifting condition that matches the current shifting conditions, including: Determine whether the current shifting condition is an upshifting condition, and get the first judgment result of yes or no; specifically, according to the input shaft speed and throttle opening collected by the hydraulic automatic transmission, first judge whether it is an upshift Process conditions.
[0059] When the first judgment result is yes, it is judged whether the current shifting condition is a power condition, and the second judgment result is yes or no is obtained; when the second judgment result is yes, the current shifting condition is determined The operating condition is a powered upshift operating condition; when the second judgment result is negative, it is determined that the current shift operating condition is an unpowered upshift operating condition;
[0060] When the first judgment result is no, continue to judge whether the current shifting condition is a power condition, and obtain a third judgment result of yes or no; when the third judgment result is yes, determine the current The shift operating condition is a powered downshift operating condition; when the third judgment result is negative, it is determined that the current shift operating condition is an unpowered downshift operating condition.
[0061] Step S103: Execute a clutch control mode corresponding to the certain preset shifting condition.
[0062] Specifically, the step S102 can determine a certain preset shifting condition among different preset shifting conditions that match the current shifting condition, and perform a certain preset shifting condition determined in step S102. The clutch control mode corresponding to the gear condition.
[0063] Specifically, when the current operating condition is a powered upshift operating condition or an unpowered downshift operating condition, the clutch control method is the same, which is recorded as the first type of operating condition. See figure 2 , figure 2 It is a flowchart of a method of clutch control corresponding to the first type of working condition provided by an embodiment of the present invention. Such as figure 2 As shown, the method includes:
[0064] Step S201: controlling the separating clutch to enter the micro-slip friction stage, and controlling the engagement clutch to enter the oil charging preparation stage;
[0065] Specifically, by controlling the oil pressure, the torque of the separating clutch is reduced, and the condition of the separating clutch is converted from the locked state to the phase of micro-slip friction. At the same time, the engaged clutch is controlled to enter the oil charging preparation stage.
[0066] Step S202: when the coupling clutch is successfully filled with oil, control the coupling clutch and the coupling clutch to enter the torque exchange phase simultaneously;
[0067] Specifically, it is determined whether the engagement of the clutch is successful or not, and if it fails, the clutch is controlled to maintain the current control state. If the oil filling is successful, the separating clutch and the joining clutch are controlled to enter the torque exchange phase at the same time, and the clutch that transmits torque becomes the joining clutch, that is, the separating clutch transfers its torque to the joining clutch.
[0068] Step S203: When the torque exchange between the separating clutch and the connecting clutch is successful, control the separating clutch to enter the separation state, and control the connecting clutch to enter the engine speed synchronization phase;
[0069] Specifically, it is judged whether the torque exchange between the separating clutch and the connecting clutch is completed, if not, the clutch is controlled to maintain the current control state; if it is completed, the separating clutch is controlled to enter the separated state, and the connecting clutch is controlled to enter the engine speed synchronization phase.
[0070] Step S204: When the engine speed regulation is completed, control the combined clutch to enter the locked state.
[0071] Specifically, the engine speed transitions from the speed of the current gear to the speed of the target gear, and it is judged whether the engine speed adjustment is completed. If not, the clutch is controlled to maintain the current control state; if it is completed, the engaged clutch is controlled to enter the locked state. The entire shifting process for the first type of shifting conditions is completed.
[0072] Further, when the current operating condition is a powered downshift operating condition or an unpowered upshift operating condition, the clutch control mode is the same, which is recorded as the second type of operating condition. See image 3 , image 3 It is a flow chart of a method of clutch control corresponding to the second type of working condition provided by an embodiment of the present invention. Such as image 3 As shown, the method includes:
[0073] Step S301: Control the separation clutch to enter the engine speed synchronization phase, and control the engaging clutch to enter the oil charging preparation phase;
[0074] Specifically, the torque of the disconnect clutch is reduced, which transforms the disconnect clutch from the locked state into the speed synchronization phase, the engine speed transitions from the speed of the current gear to the speed of the target gear, and at the same time, the clutch is controlled to enter the oil charging preparation phase.
[0075] Step S302: When the coupling clutch is successfully filled with oil and the engine speed regulation is completed, control the coupling clutch and the coupling clutch to enter the torque exchange phase simultaneously;
[0076] Specifically, it is judged at the same time whether the engine speed adjustment and the coupling clutch oil charging are completed. If not, the control clutch maintains the current control state; if it is completed, the control separation clutch and the coupling clutch enter the torque exchange stage at the same time, and the transmission torque clutch is controlled by The disconnect clutch becomes the engagement clutch.
[0077] Step S303: When the torque exchange between the separating clutch and the connecting clutch is successful, control the separating clutch to enter a separate state, and control the connecting clutch to enter a locked state;
[0078] Specifically, it is judged whether the torque exchange between the separating clutch and the joining clutch is completed. If not, the clutch is controlled to maintain the current control state; if it is completed, the separating clutch is controlled to enter the separated state, and the joining clutch is controlled to enter the locked state. The shifting process of the shifting condition is completed.
[0079] An embodiment of the present invention provides a shift control method for a hydraulic automatic transmission, including: detecting a shift signal of the automatic transmission; when the shift signal is detected, changing the current shifting condition to a preset shift The working conditions are compared to obtain a certain preset shift working condition that matches the current shift working condition; and a clutch control mode corresponding to the certain preset shift working condition is executed. The technical scheme provided by the present invention can compare the current shifting conditions with preset different shifting conditions when the shift signal of the automatic transmission is detected, and find a certain one that matches the current shifting conditions. A preset shifting condition, and then execute the clutch control mode corresponding to this preset shifting condition, so that for different shifting conditions, the clutch control mode and the current shifting work can be adjusted in time The conditions are adapted to reduce the shock of shifting and improve the smoothness of shifting.
