Control Device Torque Compensation During Upshifting
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Solution Overview
Problem
During upshifting in a vehicle with an automatic transmission, the reduction in wheel transmission torque due to a lower gear ratio is not adequately compensated by the output torque from the rotating electrical machine, leading to potential vehicle deceleration and occupant discomfort, due to limitations in the machine's maximum torque output.
Innovation Solution
A control device that performs torque increase control during upshifting, ensuring the output torque from the rotating electrical machine is increased to compensate for the reduction in wheel transmission torque, while maintaining the operating point within the machine's operable range, thereby avoiding limitations on maximum torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If upshifting is performed with constant output torque from the rotating electrical machine, then the gear ratio is reduced, but wheel transmission torque decreases causing vehicle deceleration and occupant discomfort
Solution Approach 1:
The control device determines in advance whether the operating point is within the operable range and whether output torque is below determination torque before executing upshifting. This preliminary assessment ensures that torque increase control can be properly applied during upshifting to compensate for wheel transmission torque reduction, preventing vehicle deceleration and occupant discomfort.
2Force
If output torque from the rotating electrical machine is increased to compensate for wheel transmission torque reduction, then wheel transmission torque is maintained, but the maximum torque output limitation may be exceeded
Solution Approach 1:
The control device performs preliminary checks before upshifting to ensure the operating point is within the operable range and output torque is at or below determination torque. This predetermined condition verification ensures that subsequent torque increase control during upshifting will not exceed the rotating electrical machine's maximum torque output capability, thereby maintaining wheel transmission torque without violating power limitations.
3Device complexity
If upshifting is performed without checking operating point and torque conditions, then gear transition is simple, but torque compensation may be insufficient leading to vehicle deceleration
Solution Approach 1:
The control device implements preliminary determination of operating conditions (operating point within operable range and output torque ≤ determination torque) before upshifting. This preliminary assessment enables proper torque increase control during upshifting, ensuring sufficient wheel transmission torque compensation and preventing vehicle deceleration, while maintaining reasonable control complexity through systematic condition checking.
Data Source
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AI summary
A control device performs upshifting in a state in which an operating point of a rotating electrical machine for outputting requirement-based torque at wheel-based rotational speed falls within an operable range of the rotating electrical machine both before and after shifting a shift speed by the upshifting, and in which before shifting the shift speed, output torque from the rotating electrical machine is less than or equal to determination torque (T1), the wheel-based rotational speed being rotational speed of the rotating electrical machine based on rotational speed (V) of a wheel, the requirement-based torque being output torque from the rotating electrical machine based on required wheel transmission torque, and the determination torque (T1) being torque obtained by subtracting an amount of increased torque (ΔTmg) resulting from torque increase control from maximum torque (Tmax) that can be outputted from the rotating electrical machine at the wheel-based rotational speed.