Vehicle Acceleration Limiting Using Speed-Based Torque Control
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Solution Overview
Problem
Commercial motor driven vehicles face challenges in limiting maximum acceleration due to varying vehicle weights and road gradients, which can compromise safety, ride comfort, and fuel efficiency.
Innovation Solution
A system and method that estimate vehicle acceleration based on speed, using sensors and a control unit to limit maximum acceleration to a target level, thereby maintaining constant traveling performance regardless of vehicle weight or road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum torque of the motor is limited, then the acceleration is reduced improving safety and ride comfort, but the uphill traveling performance of the vehicle is significantly lowered
Solution Approach 1:
The patent applies dynamics by making the torque limit adjustable rather than fixed. The control unit dynamically adjusts the torque limit based on real-time operating conditions including vehicle speed, acceleration requests, and estimated vehicle weight. This allows the system to provide higher torque limits when uphill performance is needed and lower limits when safety is the priority, resolving the contradiction between safety and productivity.
Solution Approach 2:
The patent changes the parameter of torque limit based on operating conditions. By estimating vehicle weight and considering acceleration requests, the system adjusts the torque limit parameter dynamically. This enables the motor to deliver appropriate torque levels for different scenarios - limiting torque for safety during normal operation while allowing higher torque for uphill traveling when needed.
2Reliability
If the increase/decrease rate of motor torque is limited, then the acceleration is reduced improving safety, but the method is not appropriate for commercial vehicles with varying total weight
Solution Approach 1:
The patent makes the torque control dynamic by continuously estimating vehicle weight and adjusting torque limits accordingly. The control unit adapts the torque increase/decrease rate limits based on real-time conditions including estimated vehicle weight, current speed, and acceleration requests. This dynamic adaptation allows the system to maintain safety while being versatile across different loading conditions.
Solution Approach 2:
The patent implements feedback by using sensors to detect vehicle speed and accelerator pedal position, then using this information along with estimated vehicle weight to adjust torque limits. The control unit continuously monitors operating conditions and adjusts the torque control parameters in real-time, creating a closed-loop system that adapts to varying vehicle weight and maintains both safety and adaptability.
3Use of energy by moving object
If the maximum torque of the motor is limited, then the acceleration is reduced improving fuel efficiency, but the uphill traveling performance is significantly lowered
Solution Approach 1:
The patent applies dynamics by dynamically adjusting torque limits based on real-time operating conditions. The control unit monitors vehicle speed, acceleration requests, and estimated weight to determine appropriate torque levels. This allows the system to limit torque during normal operation to improve fuel efficiency while allowing higher torque output when uphill performance is required, resolving the contradiction between energy efficiency and productivity.
Solution Approach 2:
The patent changes the torque limit parameter based on operating conditions including vehicle speed, acceleration requests, and estimated vehicle weight. By adjusting this parameter dynamically, the system optimizes fuel efficiency during normal operation while maintaining the capability for high-performance uphill traveling when needed, thus resolving the contradiction between energy use and productivity.
Data Source
AI summary
Disclosed are a system and a method for limiting the maximum acceleration of a motor driven vehicle. The system and method can estimate an acceleration from a speed of a motor driven vehicle, and limit the maximum acceleration of the motor driven vehicle to a level to exert constant traveling performance regardless of the total weight of the vehicle and road gradient conditions using the estimated acceleration as a control variable for limiting the maximum acceleration, thereby improving the ride comfort and the fuel efficiency.