Patent ID: 8788233
Filing Date: 2014-07-22
Classification: G01K,G01R

Abstract:
1. A diagnostic system for a thermistor amplifier circuit, comprising: a transistor being electrically coupled in series with a controllable variable resistor, the transistor having an input terminal, a first output terminal, and a second output terminal, the first output terminal being electrically coupled to the thermistor amplifier circuit, the controllable variable resistor being electrically coupled between the second output terminal and electrical ground; the controllable variable resistor configured to have a first predetermined resistance in response to receiving a first control signal from a microprocessor; the transistor configured to apply a first test voltage signal to the thermistor amplifier circuit in response to receiving a second control signal from the microprocessor, an amplitude of the first test voltage signal being indicative of a first simulated thermistor temperature value; the microprocessor configured to determine an amplitude of a first output voltage output by the thermistor amplifier circuit in response to the first test voltage, and to determine a first test temperature value based on the amplitude of the first output voltage; and the microprocessor further configured to determine a first inaccuracy value based on the first test temperature value and the first simulated thermistor temperature value.