Vehicle Drive Unit Switchover Torque Compensation
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Solution Overview
Problem
Existing methods for controlling drive units in parallel hybrid vehicles face challenges in precise torque compensation during switchover operations, particularly due to time-synchronous communication patterns that can lead to costly angle-synchronous data transmission and potential data collisions without an exclusive communication bus.
Innovation Solution
A method where a second control unit transmits data packets to a first control unit including desired torque values and shaft angle positions for switchover operations, allowing the first control unit to calculate the correct switchover time using linear equations and adaptive angle offsets, enabling precise torque compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If angle-synchronous data transmission is implemented for precise torque compensation during switchover operations, then torque compensation precision is improved, but system complexity and communication cost increase significantly
Solution Approach 1:
The patent applies preliminary action by transmitting the switchover angle position data before the actual switchover operation occurs. The control unit receives advance notification of the impending switchover event and prepares the compensation torque accordingly. This allows the system to pre-calculate and pre-position the compensating torque without requiring complex real-time angle-synchronous communication during the critical switchover moment itself.
Solution Approach 2:
The patent introduces an intermediary approach by using a supervisory control unit that receives angle position data from one control unit and distributes relevant information to other control units. This intermediary layer processes the angle-synchronous data and converts it into time-synchronous control commands, thereby mediating between the precision requirements of angle-synchronous operation and the simplicity of time-synchronous communication.
2Ease of operation
If time-synchronous communication pattern is used for control unit communication, then communication simplicity is improved, but torque compensation precision during switchover operations deteriorates
Solution Approach 1:
The supervisory control unit acts as an intermediary that receives angle position information in time-synchronous communication and processes it to determine the precise switchover moment. It then provides compensation commands to the drive unit control unit, maintaining time-synchronous communication simplicity while achieving angle-synchronous torque compensation precision through the intermediary's data processing and coordination functions.
Solution Approach 2:
The system changes the parameter of communication timing by using time-synchronous communication for data transmission but processing the data to achieve angle-synchronous control效果. The supervisory control unit transforms the time-synchronous incoming data into angle-referenced control actions, effectively changing the temporal reference frame from time-synchronous to angle-synchronous without changing the physical communication pattern.
3Measurement precision
If angle-synchronous communication is implemented without exclusive bus availability, then torque coordination precision is improved, but data collision risk increases
Solution Approach 1:
The patent applies preliminary action by having one control unit transmit the switchover angle position data in advance to the supervisory control unit before the actual switchover occurs. This advance notification allows the supervisory unit to prepare and coordinate the compensation torque without requiring simultaneous angle-synchronous communication from multiple units, thereby eliminating data collision risk while maintaining precision through the pre-transmitted angle data.
Data Source
AI summary
A method for controlling at least one first drive unit of a vehicle as a function of operating states of a second drive unit of the vehicle during a switchover operation. The first drive unit is associated with a first control unit and the second drive unit s associated with a second control unit. At least one message is transmitted to the first control unit by the second control unit. The message includes: a first desired value TQ1 of a controlled variable prior to the switchover operation; a second desired value TQ2 of the controlled variable after the switchover operation; and information on the angular position of a shaft of the second drive unit at the projected point of time of the switchover operation.