Brake Pressure Hold Control to Conceal Vehicle Theft Immobilization
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Solution Overview
Problem
Current vehicle theft prevention systems activate brake hold states, which can alert thieves and reduce their motivation to take the vehicle, but they often fail to remain undetected by the thief, thereby reducing their effectiveness in preventing theft.
Innovation Solution
A vehicle control apparatus with a brake control unit that, upon detecting theft, applies brake fluid pressure and maintains it by keeping a bypass valve in a closed state, reducing the reaction force on the brake pedal, making it difficult for the thief to drive the vehicle without noticing the activation of theft prevention control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake hold state is activated to prevent theft, then the vehicle cannot be driven away, but the thief can notice the activation and reduce motivation to steal
Solution Approach 1:
A bypass valve is introduced as an intermediary component in the brake fluid pressure circuit. When the theft prevention system activates, the bypass valve opens to allow brake fluid to bypass the master cylinder, creating a false brake failure condition that masks the actual theft prevention activation. This intermediary mechanism allows the system to maintain brake hold functionality while presenting a different symptom to the thief.
Solution Approach 2:
The system changes the parameter of brake fluid pressure distribution by controlling the bypass valve. When theft is detected, the valve state changes from closed to open, altering the brake fluid pressure characteristics. This parameter change creates a deceptive brake failure condition that hides the true state of theft prevention activation from the thief's perception.
2Reliability
If brake fluid pressure is applied to the brake mechanism to prevent vehicle movement, then the vehicle remains stationary, but the brake pedal reaction force may alert the thief to the system activation
Solution Approach 1:
The bypass valve serves as a mediator that decouples the relationship between brake pedal operation and brake mechanism actuation. When opened, it allows brake fluid to bypass the master cylinder, so that brake pedal operation does not generate the normal reaction force that would indicate theft prevention system activation to the thief.
Solution Approach 2:
The system converts the potential harmful indication of brake pedal reaction force into a beneficial deception. By opening the bypass valve, the normal brake pedal feedback is transformed into a false brake failure condition, which actually helps conceal the theft prevention activation while maintaining vehicle immobilization.
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
This approach reduces the thief's motivation to take the vehicle by creating a false brake failure recognition and maintains the vehicle in a brake hold state, enhancing theft prevention by making it difficult for the thief to drive away even if they notice the control activation.
Implementation Method 1
a stroke of a predetermined amount or more is made to a brake pedal by a brake booster to apply brake fluid pressure to the brake mechanism
Implementation Method 2
the stroke of the brake pedal by the brake booster is cancelled while a first valve disposed in a brake fluid pressure circuit is kept at a closed state to keep the pressurized state of the brake fluid pressure applied to the brake mechanism
Data Source
AI summary
The vehicle control apparatus comprises one or more processors, one or more storage media storing a program to be executed by the one or more processors. The program includes one or more instructions. The one or more instructions cause the one or more processors to perform a brake control process in which, after a stroke of a predetermined amount or more is made to a brake pedal by a brake booster to apply brake fluid pressure to the brake mechanism to make the brake fluid pressure in a pressurized state in response to input of a predetermined signal corresponding to detection of theft of the vehicle, the stroke of the brake pedal by the brake booster is cancelled while a first valve disposed in a brake fluid pressure circuit is kept at a closed state to keep the pressurized state of the brake fluid pressure applied to the brake mechanism.