FAILURE DETECTOR FOR AUTOMATIC TRANSMISSION

• Main Author: YOSHIDA TOSHIYASU
• Format: Patent
• Language: English
• Published: 19.06.1990
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; THERMAL INSULATION IN GENERAL; WEAPONS

PURPOSE:To make it possible to prevent secondary failures of an automatic transmission with rapid detection of the failed condition by judging the automatic transmission to be failed if a vehicle does not start moving in spite of the vehicle condion being ready for starting. CONSTITUTION:A control unit 300 detects that a signal from a position selection switch 304 is showing a range other than P and N, an idling switch 306 is off, a foot brake switch 307 is off, and a parking brake switch 308 is off. When a condition in which the vehicle speed is lower than a low value V0 continues for a specified period of time, the condition is determined to be failure and a signal outputted to a line pressure solenoid 44 is changed to a line pressure lowering side. This causes the line pressure to be a very low value and an automatic transmission comes to a neutral condition. As a result, secondary failures of the clutch, brake, etc. are prevented.