Hybrid Shift Control Neutral Stage ABS Vibration
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Solution Overview
Problem
Hybrid vehicles experience increased wheel vibration and noise during anti-lock brake system (ABS) operation due to rapid braking and reduced friction, leading to unstable braking forces and vibration transmission to the vehicle body.
Innovation Solution
A shift control system that determines whether the ABS is operating and adjusts the vehicle's transmission to neutral (N) stage by controlling engine and motor outputs, using a brake operation determiner, shift control determiner, and shift controller to minimize vibration by setting engine and motor outputs to zero or adjusting their sum to zero, based on vehicle conditions such as speed, gear ratio, fluid temperature, and torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ABS operates during braking, then the braking force control is improved, but wheel vibration and noise increase
Solution Approach 1:
The patent introduces a torque converter as an intermediary element between the engine and transmission system. During ABS operation, the torque converter absorbs and dampens vibrations generated by rapid braking force changes, preventing these vibrations from being transmitted to the vehicle body and reducing wheel vibration and noise while maintaining effective braking control
2Reliability
If the hybrid vehicle separates engine and motor during ABS operation, then braking control is improved, but vibration transmitted to vehicle body increases
Solution Approach 1:
The torque converter serves as a vibration absorption intermediary during ABS operation. Even when the engine and motor are separated for improved braking control, the torque converter remains engaged and absorbs vibrations generated during braking, preventing their transmission to the vehicle body while maintaining the benefits of engine-motor separation for braking control
3Speed
If rapid braking is applied during ABS operation, then stopping distance is reduced, but braking force stability decreases
Solution Approach 1:
The torque converter acts as a vibration damping intermediary that absorbs shocks and stabilizes braking forces during rapid ABS operation. It smooths out the rapid fluctuations in braking force while maintaining the overall braking effectiveness, thereby reducing vibration and noise without compromising stopping distance
Data Source
AI summary
A shift control system and method that determine whether an ABS is operating in a running vehicle to operate a transmission of the vehicle are provided. The system determines whether the vehicle can be shifted to a neutral stage (N) based on vehicle conditions. A shift control signal is then generated and transmitted to a transmission to execute a shift of the vehicle to the stage N.