Method and system for verifying normal operation of negative pressure sensor of brake booster
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsYoung-Kyun Son, Hee-Sung Yoon, Sung-Hyun Cho
Life of this patent
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Abstract
A method and a system for verifying normal operation of a negative pressure sensor of a brake booster is provided. The method and system verify whether the negative pressure sensor of the brake booster is in normal operation and the normal operation of the booster negative pressure sensor is detected by mutually verifying values measured by the booster negative pressure sensor and values measured by sensors that indirectly sense the booster negative pressure.
Claims18
A method for verifying normal operation of a booster negative pressure sensor, comprising:
- identifying, by a controller, whether values of the booster negative pressure sensor, an intake-manifold pressure sensor, and an atmospheric pressure sensor are detected, respectively;
- detecting, by the controller, whether a brake lamp switch (BLS) is turned on, a main cylinder pressure (MCP), an atmospheric pressure, an intake-manifold pressure, a booster negative pressure, and a booster vacuum pressure;
- distinguishing, by the controller, compensation factors for compensating a malfunction of the booster negative pressure sensor based on any combination of whether the BLS is turned on, the MCP, the atmospheric pressure, the intake-manifold pressure, the booster negative pressure, and the booster vacuum pressure;
- determining, by the controller, any one of a low stuck-at condition, a high stuck-at condition, and an offset error condition of the booster negative pressure sensor based on the compensation factors for compensating the malfunction of the booster negative pressure sensor;
- and
- switching, by the controller, a low vacuum brake assist (LVBA) that has used values of the booster negative pressure sensor in the low stuck-at condition, the high stuck-at condition, or the offset error condition to a non-control state.
A system for verifying normal operation of a negative pressure sensor of a brake booster, comprising:
- a controller including a processor programmed to perform verification of normal operation of the negative pressure sensor and a memory configured to store information generated by the processor, wherein the controller is configured to receive signals from a booster pressure sensor within a brake booster, an atmospheric pressure sensor, and an intake-manifold pressure sensor;
- a data map as a table in which signals are mapped and stored in the memory and configured to transmit and receive data to and from the data map;
- a brake lamp switch (BLS) and a main cylinder pressure (MCP) configured to transmit a signal to the controller;
- and
- an electronic stability control (ESC) configured to transmit a signal to the controller, wherein normal operation of the booster negative pressure sensor is verified by mutually verifying values measured by the booster negative pressure sensor and values measured by sensors configured to indirectly sense the booster negative pressure.
Dependencies are inferred from the claim text.