METHOD AND APPARATUS FOR STARTER MOTOR DIAGNOSIS AND PROGNOSIS USING PARAMETER ESTIMATION ALGORITHM
First Claim
1. A method for determining the state of health of a starter motor in a vehicle, said method comprising:
- determining a starter motor current;
determining a starter motor voltage;
determining an engine speed;
identifying starter motor values that will be used to determine the state of health of the starter motor;
identifying a time model of the starter motor using the starter motor voltage, the starter motor current, the engine speed and the starter motor values;
defining model parameters from the time model;
providing a regression model based on the time model;
determining motor parameters based on the regression model;
determining an error using the motor parameters; and
comparing the error to an error threshold to determine the state of health of the starter motor.
8 Assignments
0 Petitions
Accused Products
Abstract
A system and method for determining the state of health of a starter motor to notify a vehicle driver of a potential starter motor failure before the failure actually occurs. The starter motor includes an armature and motor brushes each providing a resistance, and an armature coil providing an armature inductance. Further, the starter motor has a back EMF because of the starter motor being coupled to a flywheel and the vehicle engine. The system and method monitor the combined resistance of the armature and the motor brushes, the inductance of the armature and a back EMF constant of the motor, and provide a signal indicating a potential starter motor failure if any of these three values significantly deviates from nominal values. In one embodiment, the analysis of the motor resistance, armature inductance and back EMF constant is provided by a regression model to determine estimated motor parameters.
42 Citations
20 Claims
-
1. A method for determining the state of health of a starter motor in a vehicle, said method comprising:
-
determining a starter motor current; determining a starter motor voltage; determining an engine speed; identifying starter motor values that will be used to determine the state of health of the starter motor; identifying a time model of the starter motor using the starter motor voltage, the starter motor current, the engine speed and the starter motor values; defining model parameters from the time model; providing a regression model based on the time model; determining motor parameters based on the regression model; determining an error using the motor parameters; and comparing the error to an error threshold to determine the state of health of the starter motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for determining the state of health of a starter motor in a vehicle, said method comprising:
-
determining a starter motor current; determining a starter motor voltage; determining an engine speed; identifying a starter motor resistance that is a combination of a starter motor armature resistance and a starter motor brush resistance; identifying a starter motor armature inductance; identifying a back EMF motor constant; identifying a time model of the starter motor using the starter motor voltage, the starter motor current, the engine speed, the starter motor resistance, the starter motor armature inductance and the back EMF motor constant; defining model parameters from the time model; providing a regression model based on the time model; determining motor parameters Rm, Km and Lm as - View Dependent Claims (13, 14, 15)
-
-
16. A method for determining the state of health of a starter motor in a vehicle, said method comprising:
-
identifying a time model of the starter motor using a starter motor voltage, a starter motor current, an engine speed, a starter motor resistance, a starter motor armature inductance and a back EMF motor constant; defining model parameters from the time model; using the model parameters to determine an error that is used to determine the state of health of the starter motor. - View Dependent Claims (17, 18, 19, 20)
-
Specification