Vehicle Control System Interrupting Device for Autonomous Braking
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Solution Overview
Problem
Existing vehicle control systems face challenges in ensuring sufficient braking force during autonomous operation, especially when the brake device is aged or under varying road surface conditions, and may require excessive engine operation to maintain vehicle control.
Innovation Solution
A vehicle control system that includes a prime mover, a drive wheel, a brake device, and an interrupting device, controlled by a system that detects stop points, disengages the interrupting device to stop the vehicle, confirms safety conditions before re-engaging it, and manages engine and motor operation to maintain braking force and reduce unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the throttle valve is closed to stop the vehicle, then the vehicle can be stopped at the stop point, but the braking force may not be established sufficiently when the brake device is aged or road surface conditions are poor
Solution Approach 1:
The vehicle stopping control is divided into two independent control mechanisms: throttle valve control for power management and brake device control for stopping. By segmenting the control functions, the system ensures that brake force can be independently optimized without being constrained by throttle position, resolving the contradiction between reliable braking and ease of operation.
Solution Approach 2:
The controller acts as an intermediary that coordinates between the throttle valve and brake device. It manages the timing and coordination of throttle closure and brake application, ensuring that both systems work together optimally to achieve reliable stopping control even when brake devices are aged or road conditions are poor.
2Reliability
If the engine operates continuously to maintain vehicle control, then the vehicle can respond to control commands, but energy consumption increases
Solution Approach 1:
The engine operates periodically rather than continuously - it runs during acceleration phases and stops during deceleration or coasting phases. The controller manages periodic engine operation to maintain vehicle control responsiveness when needed while reducing energy consumption during phases where engine power is not required.
Solution Approach 2:
The vehicle utilizes coasting and inertial motion to maintain movement during phases when the engine is stopped. The vehicle's momentum and the coordinated control of throttle and brake systems enable the vehicle to service its own motion needs without continuous engine operation, reducing energy consumption while maintaining control capability.
Data Source
AI summary
A vehicle control system to prevent a shortage of a braking force when temporarily stopping a vehicle during autonomous operation. The vehicle control system comprises: a prime mover; a drive wheel; a brake device that applies a brake torque to the drive wheel; an interrupting device that selectively allows a torque transmission the prime mover and the drive wheel; and a controller that operates a vehicle autonomously. The controller is configured to: detect a stop point; stop the vehicle temporarily at the stop point; disengage the interrupting device; and engages the interrupting device after confirming safety condition.