Vehicle Control Apparatus Torque Moderation Low-Speed Fluctuations
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Solution Overview
Problem
Electric vehicles experience fluctuations during acceleration from low-speed states, particularly after gear shifting from drive to reverse or reverse to drive, due to abrupt changes in drive torque, leading to passenger discomfort.
Innovation Solution
A vehicle control apparatus comprising a detection section and a control section that moderates the rate of increase in drive torque based on vehicle speed and torque thresholds, using sensors to detect vehicle speed, shift position, and drive torque, and adjusting the torque to prevent fluctuations during low-speed acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive torque of the electric motor is increased to improve acceleration performance, then the acceleration capability is improved, but the vehicle fluctuates and passenger comfort deteriorates during low-speed acceleration after gear shifting
Solution Approach 1:
The control apparatus detects when the vehicle is in a low-speed state after gear shifting and preemptively moderates the rate of increase in drive torque before fluctuations can occur. This preliminary intervention prevents the harmful effect while maintaining the desired acceleration capability.
Solution Approach 2:
The control system dynamically adjusts the rate of increase in drive torque based on real-time detection of vehicle speed and gear shift status. By making the torque increase rate variable rather than fixed, the system optimizes acceleration performance while suppressing fluctuations during critical low-speed transitions.
2Loss of time
If the rate of increase in drive torque is increased to improve acceleration response, then the acceleration response is improved, but passenger comfort deteriorates due to vehicle shaking
Solution Approach 1:
The control apparatus changes the parameter of torque increase rate based on vehicle operating conditions. During low-speed acceleration after gear shifting, the rate parameter is moderated to prevent shaking, while under other conditions the full acceleration response is maintained, thus balancing response time and comfort.
Solution Approach 2:
The system continuously detects vehicle speed and gear shift status, and uses this feedback to adjust the drive torque rate of increase. This closed-loop control ensures that acceleration response is optimized while automatically suppressing fluctuations that would compromise passenger comfort.
3Object-affected harmful factors
If drive torque is moderated during low-speed acceleration, then vehicle fluctuations are suppressed, but acceleration performance is reduced
Solution Approach 1:
The control apparatus applies torque moderation selectively only in the specific local condition of low-speed acceleration after gear shifting, rather than universally limiting torque. This localized approach suppresses fluctuations precisely where needed while preserving full acceleration performance in other operating conditions.
Solution Approach 2:
The system applies partial moderation to the drive torque rate of increase only during the critical transition phase after gear shifting, rather than fully limiting acceleration. This partial action is sufficient to suppress fluctuations while minimizing impact on overall acceleration performance.
Data Source
AI summary
A vehicle control apparatus includes a detection section, a control section. The detection section is configured to detect vehicle information including a vehicle speed of a vehicle driven by an electric motor and drive torque of the electric motor. The control section is configured to moderate a rate of increase in the drive torque at the time of acceleration with respect to a rate of increase set in advance on the basis of a detection result of the detection section on condition that the vehicle speed of the vehicle is less than or equal to a predetermined speed and the drive torque is greater than or equal to a predetermined threshold.