Electronic Parking Brake Slope Control
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Solution Overview
Problem
Automatic transmission vehicles equipped with shift by wire systems face challenges in maintaining a stopped state on slopes due to potential damage to the parking sprag, which can prevent the vehicle from stopping even when the P-stage parking is engaged.
Innovation Solution
An apparatus and method for parking control that includes a brake switch, pressure detection unit, shift lever detection unit, inclination detection unit, wheel speed detection unit, vehicle speed detection unit, electronic parking brake state detection unit, and a control unit to determine the driver's parking intention and vehicle state, operating the electronic parking brake to maintain the vehicle's stop state when parked on a slope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parking sprag is used in the automatic transmission to maintain P-stage parking, then the vehicle can be parked on a slope, but the parking sprag may be damaged due to stress and fail to stop the vehicle
Solution Approach 1:
The patent replaces the mechanical parking sprag system with an electronic parking brake system. The electronic parking brake uses an actuator to apply braking force to the wheels, eliminating the reliance on the mechanical parking sprag that is susceptible to damage from slope stress. This substitution ensures reliable parking maintenance on slopes without compromising the durability of the parking mechanism.
2Reliability
If the electronic parking brake is always activated to maintain stop state on slope, then vehicle stopping reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements a dynamic control strategy where the electronic parking brake is activated only when the vehicle is detected to be on a slope through inclination sensor detection. The control unit monitors vehicle conditions and selectively engages the electronic parking brake based on slope detection, rather than continuously activating it. This dynamic approach ensures reliable stopping on slopes while minimizing unnecessary energy consumption on flat surfaces.
3Measurement precision
If multiple detection units are added to determine parking intention and vehicle state, then parking control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent utilizes existing multi-functional detection units already present in the vehicle system. The brake switch, pressure detection unit, shift lever detection unit, inclination detection unit, wheel speed detection unit, and vehicle speed detection unit are integrated into a unified parking control system. These units serve multiple functions: they monitor braking status, pressure, gear position, slope angle, wheel rotation, and vehicle speed simultaneously. This multi-functional integration achieves accurate parking intention detection without significantly increasing overall system complexity.
Data Source
AI summary
Provided are an apparatus and a method for parking control of a vehicle and the method includes a step in which a control unit determines a driver's parking intention by receiving a brake signal, pressure of a master cylinder, and a position of a shift lever from a brake switch, a pressure detection unit, and a shift lever detection unit, respectively; a step in which the control unit determines a state of the vehicle by receiving an inclination, a wheel speed, and a vehicle speed from an inclination detection unit, a wheel speed detection unit, and a vehicle speed detection unit, respectively; a step in which the control unit determines a state of an electronic parking brake; and a step in which the control unit operates the electronic parking brake through an EPB driving unit.