Hill-Start Motor Torque Control for Slope and Load Variation
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Solution Overview
Problem
Existing slope start assist devices face issues where vehicles either suddenly start on level ground or slide down on slopes due to inappropriate setting of motoring torque, leading to instability.
Innovation Solution
A vehicle control device that maintains braking force for a predetermined period after brake release, using gradient and weight data to adjust motoring torque based on road slope and vehicle weight, preventing sudden starts and slides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motoring torque is set high to prevent the vehicle from sliding down on a slope road, then the vehicle can be prevented from sliding down, but the vehicle may suddenly start on level ground when the maintaining of the braking force is released
Solution Approach 1:
The patent applies dynamics by making the motoring torque adjustable rather than fixed. The control section dynamically changes the motoring torque based on detected road gradient and vehicle weight, allowing the system to adapt between different operating conditions (slope vs. level ground) and resolve the contradiction between preventing sliding and preventing sudden starts
Solution Approach 2:
The patent changes the parameter of motoring torque based on detected conditions. The control section adjusts the torque parameter according to the road gradient and vehicle weight, transforming a static torque setting into a dynamic one that responds to environmental conditions, thereby resolving the contradiction
2Object-generated harmful factors
If the motoring torque is set low to prevent the vehicle from suddenly starting on flat ground, then the vehicle can be prevented from suddenly starting, but the vehicle may inadvertently slide down on a slope road during the time period from release of braking force
Solution Approach 1:
The system dynamically adjusts motoring torque based on real-time detection of road gradient and vehicle weight, transitioning from a static low torque setting to a dynamic setting that increases torque when slope is detected, thereby preventing sliding while avoiding sudden starts on level ground
Solution Approach 2:
The patent implements feedback by using the acquisition section to detect road gradient and vehicle weight, then feeding this information back to the control section which adjusts the motoring torque accordingly. This closed-loop feedback mechanism enables the system to respond appropriately to different road conditions and prevent both sudden starts and sliding
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents vehicles from sudden starts on level ground and slides on slopes by dynamically adjusting motoring torque based on road gradient and weight, ensuring stable vehicle positioning.
Implementation Method 1
a control section that executes control to cause the motor to generate, in the predetermined period of time, threshold torque in accordance with the gradient of the road surface on which the vehicle is stopped and the overall weight of the vehicle
Data Source
AI summary
This vehicle control device comprises: a slope movement start assistance unit that maintains a braking force until elapse of a predetermined period since execution of a braking release operation for releasing a braking force applied to the wheels of a vehicle equipped with a motor serving as a power source such that the vehicle does not go down a slope; an acquisition unit that acquires each of the gradient of a road surface on which the vehicle is stopped and the total weight of the vehicle; and a control unit that executes control for causing the motor to generate, in the predetermined period, a threshold torque that corresponds to each of the gradient of the road surface on which the vehicle is stopped and the total weight of the vehicle.