Vehicle Speed Control Using Balanced Driving and Braking Forces
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Solution Overview
Problem
Existing vehicle control systems face challenges in simplifying the control of driving force and braking force, particularly on slopes, and may experience delays in detecting hydraulic brake failures, leading to incomplete target braking force realization by electric brakes when both systems are integrated.
Innovation Solution
A vehicle control device that includes separate driving force and braking force control units, where the driving force and braking force are balanced to maintain constant vehicle speed, with adjustable values for flat, uphill, and downhill conditions, allowing for both acceleration and deceleration by dynamically controlling one of the forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving force and braking force are dynamically controlled in parallel to maintain constant vehicle speed, then vehicle speed control accuracy is improved, but control complexity increases and control interference occurs due to different responsiveness and accuracy of driving and braking systems
Solution Approach 1:
The patent segments the control system into distinct driving force control and braking force control units, each independently managing their respective forces. This segmentation allows each control unit to operate with its own optimized control strategy, avoiding the complexity and interference that would arise from integrated parallel control of both forces simultaneously.
2Device complexity
If hydraulic brake and electric brake are integrated in one control device, then space is saved and system integration is improved, but failure detection is delayed and target braking force cannot be realized when hydraulic brake fails
Solution Approach 1:
The patent separates hydraulic brake control and electric brake control into independent control devices. This segmentation enables each brake system to be monitored and controlled independently, allowing immediate detection of hydraulic brake failures and ensuring that the electric brake can immediately take over without delay to achieve the target braking force.
Solution Approach 2:
The patent implements monitoring mechanisms that detect hydraulic brake failures before they compromise safety. By having the electric brake system ready as a pre-prepared backup, the system cushions against the potential harm of brake failure, ensuring continuous braking capability even when the hydraulic system fails.
Data Source
AI summary
The present invention relates to, for example, a vehicle control device including a driving force control unit that controls a driving force generated by a wheel of a vehicle; and a braking force control unit that controls a braking force generated by the wheel; where the driving force control unit generates the driving force of a first prescribed amount and the braking force control unit generates the braking force of a second prescribed amount to control the speed of the vehicle to be constant; and acceleration or deceleration are both controllable by performing one of control of the driving force by the driving force control unit and control of the braking force by the braking force control unit.