Hybrid Vehicle Shift Control for Regenerative Braking Efficiency
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Solution Overview
Problem
Hybrid vehicles experience power loss due to unnecessary shifts during regenerative braking, which reduces regenerative efficiency and drivability, especially during high-speed travel when intermittent braking is required to maintain distance from other vehicles.
Innovation Solution
An apparatus and method for shift control that includes a road information unit, front vehicle detection unit, and shift controller to adjust transmission shift times based on road and traffic conditions, determining whether the vehicle is traveling at a high constant speed and adjusting the shift timing to minimize unnecessary shifts during intermittent braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a shift is performed during regenerative braking to maintain motor operation at peak power region, then regenerative efficiency is improved, but generation power is lost due to torque intervention control
Solution Approach 1:
The patent applies dynamics by making the shift control strategy adaptive rather than fixed. The shift controller dynamically adjusts shift timing based on real-time detection of intermittent braking situations using road information, front vehicle detection, and running state monitoring. This dynamic adjustment allows the system to optimize regenerative efficiency when shifts are beneficial while avoiding unnecessary shifts that would cause power loss.
Solution Approach 2:
The patent changes the parameter of shift timing based on detected braking patterns and vehicle operating conditions. By modifying the shift control parameters according to road information, front vehicle speed, and current running state, the system optimizes the balance between maintaining motor operation at peak power region and minimizing generation power loss during regenerative braking.
2Loss of energy
If shift timing is optimized for regenerative braking, then charging amount increases, but drivability deteriorates due to unnecessary shifts during intermittent braking
Solution Approach 1:
The patent implements feedback by continuously monitoring road information, front vehicle detection data, and current running state to detect intermittent braking situations. This feedback loop allows the shift controller to distinguish between intentional regenerative braking (where shifts should occur) and intermittent braking for distance maintenance (where shifts should be avoided), thereby improving drivability while optimizing charging amount.
Solution Approach 2:
The patent applies preliminary action by obtaining road information and front vehicle detection data before executing shift control decisions. This advance information gathering allows the system to predict upcoming braking situations and pre-adjust shift timing accordingly, preventing unnecessary shifts that would disrupt drivability during intermittent braking events.
3Ease of operation
If torque intervention control is applied during shift to achieve drivability, then shift smoothness is improved, but regenerative efficiency decreases due to power loss
Solution Approach 1:
The patent makes the torque intervention control dynamic by adjusting its application based on detected braking patterns. During genuine regenerative braking events, torque intervention is applied to maintain drivability during necessary shifts. During intermittent braking for distance maintenance, the system detects the pattern and avoids unnecessary shifts, thereby preventing regenerative efficiency loss while still maintaining drivability when appropriate.
Data Source
AI summary
An apparatus and method for a shift control of a vehicle are provided. The apparatus includes a road information obtaining unit that obtains road information of a road on which the vehicle is traveling and traffic information and a front vehicle detection unit that obtains front vehicle information including a speed of a front vehicle. A running state obtaining unit obtains an average running speed of the vehicle and determines whether the vehicle is traveling at a high constant speed based on the road information, the traffic information, and the average running speed. A shift controller adjusts a shift time of a transmission based on the front vehicle information when braking occurs during high constant speed traveling of the vehicle.