Hybrid Vehicle Gear Shift Control via Road Condition Detection
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Solution Overview
Problem
Conventional hybrid vehicles experience frequent gear shifts when driven under specific road conditions or vehicle states, leading to inefficient fuel use, increased component temperature, and reduced durability due to inadequate consideration of road conditions and vehicle states during torque management.
Innovation Solution
An apparatus and method that includes a driving state detector to assess road conditions and vehicle states, allowing a controller to differentiate between normal and compensation modes, adjusting the output of the driving motor or gear shift time points based on detected conditions to prevent frequent gear shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional torque management is used without considering road conditions and vehicle states, then the gear shift control is simple, but frequent gear shifts occur leading to increased component temperature and reduced durability
Solution Approach 1:
The patent implements dynamic gear shift control by continuously monitoring road conditions (inclination, altitude) and vehicle states (speed, acceleration, battery charge level) to adjust gear shift timing and torque management in real-time. This dynamic adaptation prevents frequent gear shifts under specific conditions while maintaining simple control architecture through rule-based decision logic.
Solution Approach 2:
The system incorporates feedback mechanisms by detecting road conditions and vehicle states, comparing them against predetermined criteria, and adjusting gear shift control accordingly. This closed-loop control prevents frequent gear shifts by anticipating problematic conditions and modifying torque management proactively, thereby extending transmission component durability without significantly increasing system complexity.
2Stability of the object's composition
If gear shift is frequently caused to maintain constant vehicle speed under specific road conditions, then vehicle speed stability is improved, but fuel efficiency deteriorates due to frequent shifting
Solution Approach 1:
The patent applies preliminary anti-action by detecting specific road conditions (inclination, altitude) and vehicle states (battery charge level, speed) in advance, then preemptively adjusting torque management and gear shift timing to prevent the need for frequent gear shifts. This proactive control maintains vehicle speed stability while avoiding the fuel efficiency penalties associated with frequent shifting operations.
3Power
If torque intervention control is performed during gear shift process, then charging torque of driving motor is reduced, but regenerative power is greatly reduced
Solution Approach 1:
The patent implements dynamic torque management that adapts gear shift control and torque intervention strategies based on real-time detection of road conditions and vehicle states. This dynamic approach optimizes the balance between motor charging torque and regenerative power by adjusting control parameters according to specific operating conditions, thereby minimizing energy loss during gear shift processes.
Data Source
AI summary
An apparatus and method for controlling gear shift of a hybrid vehicle prevent frequent gear shift by adjusting output of a driving motor or a gear shift time point of a transmission based on road condition or vehicle state while the hybrid vehicle is driven in a specific road condition or a specific vehicle state in a HEV mode. The apparatus includes a driving state detector that detects a road condition and a vehicle state and a controller that receives the road condition and the vehicle state from the driving state detector to differentiate and select a hybrid electric vehicle (HEV) mode into a normal mode and a compensation mode. The controller adjusts the output of a driving motor or a gear shift time point of a transmission according to different conditions from the driving state detector in the compensation mode.