Parking Assist Speed Limiting for Downhill Power Failure Stops
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Solution Overview
Problem
Existing vehicle control systems fail to promptly and effectively stop a vehicle when a malfunction occurs in the electric power source while it is moving on a downward slope, leading to increased stopping time or distance, or the vehicle may continue moving without being stopped.
Innovation Solution
A vehicle control apparatus comprising a driving apparatus, braking apparatus, shift change apparatus, steering apparatus, control unit, first electric power source, second electric power source, and electric power supply circuit, which allows the control unit to execute parking assist control by determining a moving route and controlling the activation of these components, with the electric power supply circuit switching to the second power source during a malfunction to ensure the vehicle can be stopped safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle is equipped with a secondary electric power source to stop the vehicle when the primary power source fails, then the vehicle can be stopped even when the primary power source malfunctions, but the stopping time increases and the stopping distance increases
Solution Approach 1:
The control unit limits the vehicle speed to a predetermined speed during parking assist control before a malfunction occurs. This preliminary speed limitation ensures that when the primary electric power source fails, the vehicle is already traveling at a lower speed that allows for quicker stopping using the secondary power source, thereby reducing the stopping time and distance while maintaining the ability to stop the vehicle
2Reliability
If the vehicle is equipped with a secondary electric power source to stop the vehicle when the primary power source fails, then the vehicle can be stopped even when the primary power source malfunctions, but the stopping distance increases
Solution Approach 1:
The control unit limits the vehicle speed to a predetermined speed during parking assist control before a malfunction occurs. This preliminary speed limitation ensures that when the primary electric power source fails, the vehicle is already traveling at a lower speed that allows for quicker stopping using the secondary power source, thereby reducing the stopping time and distance while maintaining the ability to stop the vehicle
3Productivity
If the vehicle moves at normal speed during parking assist control, then the parking assist control is efficient, but the vehicle cannot be stopped readily when a malfunction occurs on a downward slope
Solution Approach 1:
The control unit limits the vehicle speed to a predetermined speed during parking assist control before a malfunction occurs. This preliminary speed limitation ensures that when the primary electric power source fails, the vehicle is already traveling at a lower speed that allows for quicker stopping using the secondary power source, thereby reducing the stopping time and distance while maintaining the ability to stop the vehicle
Solution Approach 2:
The control unit changes the speed parameter of the vehicle during parking assist control by limiting it to a predetermined speed. This parameter change ensures that the vehicle can be stopped readily even when a malfunction occurs on a downward slope, as the lower speed provides a safety margin that allows the secondary power source to stop the vehicle effectively
Data Source
AI summary
A vehicle control apparatus sets a target speed of a vehicle such that a maximum value of the target speed is a first speed during a parking assist control. The vehicle control apparatus executes the parking assist control with maintaining a speed of the vehicle at a speed equal to or slower than a predetermined speed limit value slower than the first speed when a predetermined condition that the vehicle moves along a downward slope, is satisfied when a first electric power source device is in a normal state during the parking assist control. At least one of a braking apparatus and a shift change apparatus executes a stopping control of stopping the vehicle when a malfunction occurs in the first electric power source device during the parking assist control.