Hybrid Vehicle Gear Shift Shock Suppression via Dynamic Compensation
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Solution Overview
Problem
Hybrid vehicles experience gear shift shock due to variations in driving force output when the required driving force exceeds the upper limit driving force, especially when the gear ratio of the stepped transmission is changed.
Innovation Solution
The hybrid vehicle employs a control device that sets a target compensation power for the power storage device based on the difference between the required driving force and the upper limit driving force, gradually increasing this power when the gear ratio changes, to maintain a consistent driving force output and reduce gear shift shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the required driving force exceeds the upper limit driving force and the gear ratio of the stepped transmission is changed, then the driving force output can be increased to meet the required driving force, but the variation in driving force output becomes larger causing gear shift shock
Solution Approach 1:
The patent applies dynamics by making the compensation power adjustable and time-dependent. The control device dynamically adjusts the compensation power from the power storage device based on the gear ratio state, transitioning from a static compensation approach to a dynamic one that responds to gear ratio changes, thereby suppressing driving force variations during gear shifts
Solution Approach 2:
The patent implements feedback control by monitoring the gear ratio of the stepped transmission and adjusting the compensation power accordingly. The control device receives feedback about gear ratio changes and modifies the battery power compensation in real-time, creating a closed-loop control system that suppresses gear shift shock
2Productivity
If the working compensation power is increased abruptly to meet the required driving force, then the driving force output increases quickly, but the variation in driving force output becomes larger causing gear shift shock
Solution Approach 1:
The patent applies periodic action by implementing a two-stage compensation power adjustment: an initial stage with higher compensation power for quick response, followed by a secondary stage with reduced compensation power to maintain stability. This periodic adjustment pattern allows the system to respond quickly to driving force requirements while avoiding abrupt changes that cause gear shift shock
Data Source
AI summary
When the required driving force is larger than the first upper limit driving force, the control device sets a target compensation power of a power storage device, based on a difference between the required driving force and the first upper limit driving force. Further, the control device gradually increases a working compensation power toward the target compensation power when the gear ratio of the stepped transmission is changed, compared with an increase in the working compensation power when the gear ratio of the stepped transmission is not changed.