Fast detection of error conditions in vehicle vacuum sensors for a hydraulic boost compensation system
AssigneeRobert Bosch GmbH
InventorsWilly Klier, Kenta Mineo, Scott Amenson
Life of this patent
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Abstract
Systems and methods of monitoring redundant vacuum sensors in the same vacuum chamber of a braking system to determine when an error condition is present in a braking system. The braking system includes a first sensor positioned in a chamber of the braking system and a second sensor positioned in the same chamber. A first reading is received from the first sensor and a second reading is received from the second sensor. A difference between the first reading and the second reading is determined. An error condition is indicated when the difference between the first reading and the second reading is greater than a threshold.
Claims15
A method of determining when an error condition is present in a braking system, the braking system including a first sensor positioned in a chamber of the braking system and a second sensor positioned in the same chamber of the braking system, the method comprising:
- receiving a first reading from the first sensor in the chamber of the braking system;
- receiving a second reading from the second sensor in the chamber of the braking system;
- determining a difference between the first reading and the second reading;
- and
- indicating that an error condition is detected when the difference between the first reading and the second reading is greater than a threshold.
A hydraulic boost compensation system comprising:
- a vacuum chamber of a braking system;
- a first vacuum sensor positioned in the vacuum chamber;
- a second vacuum sensor positioned in the vacuum chamber;
- a controller configured to
- receive a first reading from the first sensor in the vacuum chamber of the braking system;
- receive a second reading from the second sensor in the vacuum chamber of the braking system;
- determine a difference between the first reading and the second reading;
- and
- indicate that an error condition is detected when the difference between the first reading and the second reading is greater than a threshold.
A controller for a braking system, the braking system including a vacuum chamber, a first vacuum sensor positioned in the vacuum chamber, and a second vacuum sensor positioned in the vacuum chamber, the controller including a processor and a memory storing instructions that, when executed by the processor, cause the controller to:
- receive a first reading from the first vacuum sensor;
- receive a second reading from the second vacuum sensor;
- calculate a sensor reading difference, the sensor reading difference being the difference between the first reading and the second reading;
- calculate a rate of change of the sensor reading difference over time;
- indicate that a first error condition is detected when the rate of change of the sensor reading difference remains above a gradient threshold for a first defined period of time;
- compare the sensor reading difference to a first difference threshold;
- indicate that a second error condition is detected when the sensor reading difference remains above the first difference threshold a second defined period of time;
- add the difference between the sensor reading difference and the first difference threshold to a sum of previous threshold differences;
- indicating that a third error condition is detected when the sum of previous differences exceeds a sum difference threshold;
- and
- resetting the sum of previous threshold differences when the sensor reading difference remains below a second difference threshold for a third defined period of time.
Dependencies are inferred from the claim text.