Vehicle Control Device Clutch Reengagement Torque Compensation
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Solution Overview
Problem
Existing vehicle control systems face challenges in maintaining driving response and suppressing shocks when transitioning between engine and electric motor driving sources, particularly when the accelerator pedal is pressed during mode switching.
Innovation Solution
A control device and method that includes a control unit which reengages the clutch and increases the electric motor's torque when the accelerator pedal opens beyond a predetermined level during driving source switching, ensuring the engagement capacity of the clutch is maintained and the motor's torque is enhanced to compensate for delays in clutch reengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the engagement capacity of the clutch is decreased while transitioning from HEV mode to EV mode, then shock generation is suppressed, but driving response deteriorates when the accelerator pedal is pressed during switching
Solution Approach 1:
The control device detects when the accelerator pedal opening increases during the switching process and preliminarily increases the torque of the electric motor before the clutch reengagement is complete. This preliminary torque increase ensures that sufficient driving force is available during the delay period, preventing deterioration of driving response while the clutch engagement capacity is being restored.
Solution Approach 2:
The control device dynamically changes the torque parameter of the electric motor based on the accelerator pedal opening degree. When the pedal opening exceeds a predetermined threshold during switching, the electric motor torque is increased to compensate for the reduced clutch engagement capacity, thereby maintaining driving response without causing shock.
2Speed
If the torque of the electric motor is increased to compensate for clutch disengagement delay, then driving response is improved, but energy consumption increases
Solution Approach 1:
The control device applies partial action by increasing the electric motor torque only to the extent necessary to compensate for the clutch reengagement delay. The torque increase is conditional and temporary, activated only when the accelerator pedal opening exceeds a predetermined degree during switching, rather than continuously maintaining excessive torque. This ensures sufficient driving response while minimizing unnecessary energy consumption.
3Stability of the object's composition
If the clutch reengagement is delayed to prevent shock, then smooth transition is achieved, but torque transmission delay occurs when accelerator pedal is pressed
Solution Approach 1:
The electric motor acts as an intermediary to bridge the torque transmission gap during clutch reengagement delay. When the accelerator pedal is pressed during switching, the electric motor provides supplementary torque to compensate for the delayed clutch engagement, ensuring that the total torque transmitted to the drive shaft meets the driver's demand without causing shock or noticeable delay.
Data Source
AI summary
A control device for a vehicle includes a drive shaft, an engagement element, an engine coupled via the engagement element, an electric motor coupled without via the engagement element, and a control unit that instructs a reengagement of the engagement element when an accelerator pedal opening increases to equal to or more than a predetermined degree of opening during switching of driving sources in which an engagement capacity of the engagement element is decreased while a torque of the electric motor is increased, and increases the torque of the electric motor to more than the torque of the electric motor before the accelerator pedal opening increases to equal to or more than the predetermined degree of opening until the engagement capacity of the engagement element starts increasing.