Automobile Torque Control for Sudden Acceleration
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Solution Overview
Problem
Automobile drivers experience sudden acceleration when the upper limit torque for the input shaft of the transmission is restricted from a higher torque to a lower torque and then returned, leading to a decrease in torque output to the driving wheels.
Innovation Solution
An electronic control unit is implemented to control the motor and transmission, restricting the upper limit torque from a first torque to a second torque smaller than the first torque and returning it to the first torque more gradually when a driver is assumed to have felt a decrease in driving force output, thereby suppressing sudden acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the upper limit torque is returned quickly from the second torque to the first torque, then the response time is improved, but the driver may feel sudden acceleration
Solution Approach 1:
The upper limit torque is returned not in a single abrupt action but through periodic adjustments over time. The control unit increases the upper limit torque in stages, checking conditions at each interval, which transforms a sudden torque change into a series of smaller, more manageable increments that prevent sudden acceleration while still restoring performance.
Solution Approach 2:
The system dynamically adjusts the rate of torque restoration based on real-time driving conditions. When the first condition is met (indicating the driver has felt driving force decrease), the system switches to a gradual restoration mode; otherwise, it uses faster restoration. This dynamic adaptation resolves the contradiction by making the restoration speed context-dependent.
2Force
If the upper limit torque is restricted to the second torque smaller than the first torque, then the torque output to the driving wheels is reduced, but the driver may press harder on the accelerator pedal
Solution Approach 1:
The system continuously monitors driving conditions and driver behavior (through the first condition detection) to determine when torque restriction is affecting the driving experience. This feedback mechanism allows the system to recognize when the driver has perceived the torque decrease and adjust the torque restoration strategy accordingly, preventing excessive accelerator pressure while maintaining safety.
Solution Approach 2:
The system performs preliminary assessment of driving conditions before fully restoring the upper limit torque. By checking whether the first condition is met during the torque restoration process, the system prepares for appropriate restoration speed, preventing sudden torque changes that would cause abrupt acceleration while still recovering performance efficiently.
Data Source
AI summary
An electronic control unit controls a motor so that a torque applied to an input shaft does not exceed an upper limit torque. The electronic control unit sets so as to restrict the upper limit torque from a first torque to a second torque smaller than the first torque, and then return the upper limit torque to the first torque more gradually when a first condition that a driver is assumed to have felt a decrease in driving force output to driving wheels is met before the upper limit torque is returned than when the first condition is not met.