DIAGNOSTIC SYSTEMS AND METHODS FOR A TORQUE SENSOR
First Claim
1. A diagnostic system comprising:
- an engine torque module that generates a first estimated torque signal based on a mass airflow signal, a fuel amount delivered to cylinders of an engine, and an engine speed;
a torque detection module that generates an actual torque signal based on a torque signal received from a torque sensor that indicates an actual output torque of a transmission;
a torque estimation module that generates a second estimated torque signal independent of the actual torque signal, wherein the second estimated torque signal is generated based on the first estimated torque signal, a transmission gain value, a transmission loss value, and a transmission offset value; and
a diagnostic module that detects a fault of the torque sensor based on a torque difference between the actual torque signal and the second estimated torque signal.
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Accused Products
Abstract
A system for a vehicle includes an engine torque module, a torque detection module, a torque estimation module, a torque monitoring module, and a diagnostic module. The engine torque module generates a first estimated torque signal based on engine signals and/or GPS signals. The torque detection module generates an actual torque signal of a transmission. The torque estimation module generates a second estimated torque signal based on the first estimated torque signal and/or vehicle/engine values. The diagnostic module detects a fault of a torque sensor based on a torque difference between the actual torque signal and the second estimated torque signal. The torque monitoring module generates a first and a second torque signals based on actual torque signals that represent a lowest and a highest torque values respectively over a predetermined period. The diagnostic module detects the fault based on a torque difference the first and the second torque signals.
21 Citations
20 Claims
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1. A diagnostic system comprising:
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an engine torque module that generates a first estimated torque signal based on a mass airflow signal, a fuel amount delivered to cylinders of an engine, and an engine speed; a torque detection module that generates an actual torque signal based on a torque signal received from a torque sensor that indicates an actual output torque of a transmission; a torque estimation module that generates a second estimated torque signal independent of the actual torque signal, wherein the second estimated torque signal is generated based on the first estimated torque signal, a transmission gain value, a transmission loss value, and a transmission offset value; and a diagnostic module that detects a fault of the torque sensor based on a torque difference between the actual torque signal and the second estimated torque signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A diagnostic system comprising:
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an engine torque module that generates a first estimated torque signal based on a global positioning system (GPS) vehicle speed signal, a throttle signal, and a gear ratio of a transmission; a torque detection module that generates an actual torque signal based on a torque signal received from a torque sensor that indicates an actual output torque of the transmission; a torque estimation module that generates a second estimated torque signal independent of the actual torque signal, wherein the second estimated torque signal is generated based on the first estimated torque signal and an estimated vehicle mass value; and a diagnostic module that detects a fault of the torque sensor based on a torque difference between the actual torque signal and the second estimated torque signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A diagnostic system comprising:
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a torque detection module that generates an actual torque signal based on a torque signal received from a torque sensor that indicates an actual output torque of a transmission; a torque monitoring module that generates a first torque signal based on the actual torque signal that represents a lowest torque value over a first predetermined period, wherein the torque monitoring module generates a second torque signal based on the actual torque signal that represents a highest torque value over the first predetermined period; and a diagnostic module that detects a fault of the torque sensor based on a minimum expected noise value and a torque difference between the first torque signal and the second torque signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification