Failsafe system in automatic transmission

Patent · Tue Nov 22 04:00:00 EST 1988

OSTI ID:6232022

Iwatsuki, K; Shindo, Y

This patent describes a failsafe system in an automatic transmission for a vehicle, comprising: means for detecting an output shaft rotary speed of the automatic transmission; means for detecting engine rotary speed; means for detecting engine load; means for detecting whether a lockup clutch of the automatic transmission is engaged; means for detecting whether a prescribed period of time has elapsed from either a shift judgment or a shift command of the automatic transmission; means for determining a correlation between the output shaft rotary speed and the engine rotary speed when the engine load is higher than a predetermined value, the lockup clutch is engaged, and the prescribed period of time has elapsed form either of the shift judgment or shift command of the automatic transmission; means for judging whether the correlation is abnormal; and means for increasing oil pressure in a hydraulic control device of the automatic transmission when the correlation is judged to be abnormal.

• Assignee: Tokyo Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4785689
• OSTI ID: 6232022
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ANGULAR VELOCITY
AUTOMATION
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL SYSTEMS
EQUIPMENT
GEARS
HYDRAULIC EQUIPMENT
MACHINE PARTS
MEASURING INSTRUMENTS
MECHANICAL TRANSMISSIONS
METERS
PRESSURE CONTROL
SHAFTS
TIMING PROPERTIES
VEHICLES
VELOCITY