Brake booster vacuum sensor diagnostic
First Claim
Patent Images
1. A diagnostic system for a brake booster sensor, comprising:
- a monitor that monitors a maximum error and a minimum error based on a brake booster sensor signal over a monitoring period; and
a first comparator that determines one of a pass status and a fail status of said brake booster sensor based on said maximum error and said minimum error.
13 Assignments
0 Petitions
Accused Products
Abstract
A diagnostic system for a brake booster sensor includes a monitor that monitors a maximum error and a minimum error based on a brake booster sensor signal over a monitoring period. A first comparator determines one of a pass status and a fail status of the brake booster sensor based on the maximum error and the minimum error.
-
Citations
25 Claims
-
1. A diagnostic system for a brake booster sensor, comprising:
-
a monitor that monitors a maximum error and a minimum error based on a brake booster sensor signal over a monitoring period; and
a first comparator that determines one of a pass status and a fail status of said brake booster sensor based on said maximum error and said minimum error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of evaluating operation of a brake booster sensor of a vehicle brake booster, comprising:
-
determining whether an engine vacuum is greater than a brake booster vacuum;
monitoring an error reduction fraction if said engine vacuum is greater than said brake booster vacuum;
indicating a pass status for said brake booster sensor if said error reduction fraction achieves a predetermined level; and
indicating a fail status for said brake booster sensor if said error reduction fraction is below said predetermined level. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A vehicle having a sensor diagnostic system, comprising:
-
a displacement on demand (DOD) engine having an intake manifold and a plurality of cylinders;
a brake booster that is in selective communication with said intake manifold; and
a controller that determines whether an engine vacuum is greater than a brake booster vacuum, that monitors an error reduction fraction if said engine vacuum is greater than said brake booster vacuum, that indicates a pass status for a brake booster sensor if said error reduction fraction achieves a predetermined level and that indicates a fail status for said brake booster sensor if said error reduction fraction is below said predetermined level. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification