Hybrid Motor Generator Locking Control for Shock Reduction
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Solution Overview
Problem
Hybrid vehicles with lockable motor generators face issues with torque variation during mode switches, leading to shock and inefficient fuel use due to uniform rotation speed decrease rates across different operation modes.
Innovation Solution
A control apparatus that adjusts the rotation speed decrease rate of the motor generator differently for low and high torque operation modes, starting the locking process at a higher rotation speed in low torque mode and completing it in the same time as high torque mode, to minimize shock and fuel efficiency deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a uniform rotation speed decrease rate is applied in both low torque and high torque operation modes, then the locking operation can be completed in consistent time, but shock generated in the vehicle increases in low torque mode due to unnecessarily high engagement torque capacity
Solution Approach 1:
The patent applies different rotation speed decrease rates for different operation modes (low torque mode uses a lower decrease rate, high torque mode uses a higher decrease rate). This local differentiation allows the locking operation to be optimized for each specific operating condition, reducing shock in low torque mode while maintaining efficient locking in high torque mode.
Solution Approach 2:
The patent changes the parameter of rotation speed decrease rate based on the operation mode. By adjusting this parameter according to whether the engine is in low torque or high torque mode, the system achieves optimal locking performance for each condition, preventing excessive shock while maintaining consistent operation time.
2Device complexity
If a uniform rotation speed decrease rate is applied in both operation modes, then the control logic is simple, but fuel efficiency deteriorates in low torque mode due to unnecessary rotation speed reduction
Solution Approach 1:
The patent implements local quality by applying different rotation speed decrease rates specific to each operation mode. In low torque mode, a lower decrease rate is used to minimize energy consumption, while in high torque mode, a higher decrease rate is applied. This targeted approach improves fuel efficiency without significantly complicating the control logic.
3Object-generated harmful factors
If the rotation speed decrease rate is reduced in low torque operation mode to minimize shock, then fuel efficiency improves, but the locking operation time becomes longer
Solution Approach 1:
The patent changes the rotation speed decrease rate parameter based on operation mode to balance shock reduction and time efficiency. By using a lower decrease rate in low torque mode, the system prioritizes shock reduction and fuel efficiency, while accepting a longer operation time that is still acceptable for this specific operating condition.
4Productivity
If the rotation speed decrease rate is increased in high torque operation mode to reduce locking time, then productivity improves, but shock generated in the vehicle increases
Solution Approach 1:
The patent applies local quality by using a higher rotation speed decrease rate specifically for high torque operation mode. This allows the system to achieve faster locking operations when the engine is producing high torque, improving productivity while accepting that some shock is tolerable in this high-power operating condition.
Data Source
AI summary
Controlling a hybrid vehicle includes: reducing a rotation speed of a motor generator before a locking apparatus that locks the motor generator is switched from a disengaged condition to an engaged condition; starting to switch the locking apparatus to the engaged condition when the rotation speed decreases to a predetermined operation permission rotation speed; controlling the locking apparatus such that from the start of the switch to the engaged condition onward, the rotation speed decreases from the operation permission rotation speed to an engagement rotation speed with the motor generator in the engaged condition; and controlling the locking apparatus such that a decrease rate of the rotation speed when switching from the disengaged condition to the engaged condition in a low torque operation mode is higher than the decrease rate of the rotation speed when switching from the disengaged condition to the engaged condition in a high torque operation mode.