Pedalless electronically controlled hydraulic braking system with redundant pump
a technology of electronic control and hydraulic braking system, which is applied in the direction of braking system, braking components, transportation and packaging, etc., can solve the problems of loss of fluid pressure and adversely affect the operation of the braking system
Inactive Publication Date: 2019-02-14
CONTINENTAL AUTOMOTIVE SYST INC
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Benefits of technology
The patent describes a braking system for autonomous vehicles that includes a first control system and a second control system. The first control system uses a pump to pressurize the brakes, while the second control system is designed to activate in case of a fault in the first system. The second control system can include a second pump and a second electronic control unit. The system can also include a pressure sensor to detect low pressure, and valves to control the braking devices. The technical effect of this system is to ensure safe and reliable braking of the autonomous vehicle in case of a failure in the first control system.
Problems solved by technology
A loss of fluid pressure can adversely affect operation of the braking system.
Method used
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[0031]A autonomously controlled vehicle 10 is schematically illustrated in FIG. 1. Such vehicles do not have brake pedals manually operated by the vehicle occupant. The vehicle 10 includes a braking system 12 for selectively controlling the braking input to wheels 14a-14d in response to commands from a controller for automated braking. A braking device 16a-16d is typically associated with each of the wheels 14a-14d and are typically provided by a brake caliper or other braking element.
[0032]Hydraulic circuits, schematically illustrated by fluid lines 18, 20 and connections carry pressurized fluid to the braking devices 16a-16d to selectively actuate the brakes during vehicle operation.
[0033]In the case of an autonomously controlled vehicle, it may be desirable to have some redundancy in the braking system to ensure braking capability is maintained in the event of a brake component malfunction or failure. To this end, first and second control systems 22, 24 are provided in the brakin...
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A braking system for an autonomous vehicle includes a brake device that is configured to brake a vehicle wheel. A first control system includes a first pump fluidly connected to the brake device via a hydraulic circuit. A second control system includes a second pump fluidly connected to the brake device via the hydraulic circuit. The second pump is fluidly connected in parallel with the first pump. A controller is in communication with the first and second control systems. The controller is configured to detect a fault in the first control system. The controller is configured to command the second pump to pressurize the hydraulic circuit in response to the failure.
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. application Ser. No. 14 / 796,257 filed Jul. 10, 2015, which claims priority to U.S. Provisional Application No. 62 / 022,739 filed on Jul. 10, 2014.BACKGROUND[0002]This disclosure relates to an automotive vehicle hydraulic braking system that is electronically controlled to decelerate and stop a vehicle via a pump. The braking system also enables safety features such as anti-lock braking and stability control.[0003]Vehicles that can be driven autonomously are able to stop themselves when their onboard sensors determine that the vehicle needs to slow or stop. Thus, driver input or assistance is not required to stop the vehicle. Typically, vehicle brake systems include a brake caliper or similar braking device associated with each vehicle wheel. Pressurized hydraulic fluid is provided to each braking device to selectively arrest rotation of the associated vehicle wheel. The pressurized fluid is provide...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B60T17/22B60T8/32B60T8/88B60T7/12B60T8/40
CPCB60T8/4081B60T8/326B60T17/221B60T8/885B60T7/12B60T2270/402
Inventor LESINSKI, ROGER JOHN
Owner CONTINENTAL AUTOMOTIVE SYST INC