Abnormality determination system for revolution speed sensor
First Claim
1. An abnormality determination system for revolution speed sensors comprising:
- a first speed sensor for detecting a revolution speed of one shaft of an automatic transmission and for outputting a first speed signal corresponding to the speed;
a second speed sensor for detecting a revolution speed of another shaft of said automatic transmission and for outputting a second speed signal corresponding to the speed;
abnormality determination means for determining if either of said speed sensors is abnormal by comparing the first speed signal from said first speed sensor with the second speed signal from said second speed sensor, and for outputting an abnormality determination signal if it is determined that one of said speed sensors is abnormal;
shifting detection means for detecting that said automatic transmission is shifting and for outputting a shifting indication signal which denotes that a shift of the automatic transmission is being executed; and
abnormality determination halt means for halting the abnormality determination executed by said abnormality determination means when the shifting indication signal is received.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved abnormality determination system for revolution speed sensors is provided to accurately determine if either of two revolution speed sensors built in shafts of an automatic transmission is abnormal and to prevent itself from misjudging the abnormality of the speed sensor during shifting of the automatic transmission. Thus, the abnormality determination system for revolution speed sensors especially includes shifting detection means (M5) for detecting that an automatic transmission (M1) is shifting and for outputting a shifting indication signal which denotes that a shift of the automatic transmission is being executed, and abnormality determination halt means (M6) for halting the abnormality determination executed by abnormality determination means (M4) when the shifting indication signal is received in cruising condition.
23 Citations
7 Claims
-
1. An abnormality determination system for revolution speed sensors comprising:
-
a first speed sensor for detecting a revolution speed of one shaft of an automatic transmission and for outputting a first speed signal corresponding to the speed; a second speed sensor for detecting a revolution speed of another shaft of said automatic transmission and for outputting a second speed signal corresponding to the speed; abnormality determination means for determining if either of said speed sensors is abnormal by comparing the first speed signal from said first speed sensor with the second speed signal from said second speed sensor, and for outputting an abnormality determination signal if it is determined that one of said speed sensors is abnormal; shifting detection means for detecting that said automatic transmission is shifting and for outputting a shifting indication signal which denotes that a shift of the automatic transmission is being executed; and abnormality determination halt means for halting the abnormality determination executed by said abnormality determination means when the shifting indication signal is received. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification