US 6,607,463 B2 · Malfunction diagnostic method and system for output shaft rpm sensor of a transmission

Abstract

Disclosed is a malfunction method and system for an output shaft rpm sensor of a transmission. The method comprises the steps of: detecting output shaft rpm of a transmission by the output shaft rpm sensor, and detecting vehicle speed by a vehicle speed sensor; determining whether malfunction conditions, which indicate a malfunction in the output shaft rpm sensor, are satisfied based on the output shaft rpm and the vehicle speed; performing stand-by for a predetermined stand-by time if the malfunction conditions are satisfied; determining whether there is a malfunction in the output shaft rpm sensor using the detected output shaft rpm; and generating malfunction codes if it is determined that there is a malfunction in the output shaft rpm sensor. The system comprises a vehicle state detector for performing detection of various drive states and operations of elements of a vehicle, and outputting corresponding signals, and an ECU for performing the method.

Claims16

Dependent claims

A malfunction diagnostic method for an output shaft rpm sensor of a transmission for a vehicle comprising the steps of:

detecting output shaft rpm of a transmission by the output shaft rpm sensor, and detecting vehicle speed by a vehicle speed sensor;
determining whether malfunction conditions, which indicate a malfunction in the output shaft rpm sensor, are satisfied based on the output shaft rpm and the vehicle speed;
performing stand-by for a predetermined stand-by time if the malfunction conditions are satisfied;
determining whether there is a malfunction in the output shaft rpm sensor using the detected output shaft rpm;
and
generating malfunction codes if it is determined that there is a malfunction in the output shaft rpm sensor.

3 more elements

A malfunction diagnostic system for an output shaft rpm sensor of a transmission comprising:

a vehicle state detector for performing detection of various drive states and operations of elements of a vehicle, and outputting corresponding signals;
and
an ECU for generating malfunction codes according to the signals output by the vehicle state detector,
wherein the vehicle state detector includes a vehicle speed sensor for detecting vehicle speed, and wherein the ECU receives signals of the vehicle speed from the vehicle speed sensor and signals of the output shaft rpm from the output shaft rpm sensor, and determines from the vehicle speed and the output shaft rpm whether malfunction conditions are satisfied, and, in the case where the malfunction conditions are satisfied and after a predetermined standby time has elapsed, determines whether there is a malfunction in the output shaft rpm sensor using the detected output shaft rpm, after which the ECU generates malfunction codes if the output shaft rpm sensor is malfunctioning.

1 more element

Dependencies are inferred from the claim text.

Malfunction diagnostic method and system for output shaft rpm sensor of a transmission

Life of this patent

Malfunction diagnostic method and system for output shaft rpm sensor of a transmission

Life of this patent

Abstract

Claims16