Start control method for automatic clutch

Patent · Tue Aug 04 04:00:00 EDT 1987

OSTI ID:6201588

Uriuhara, M; Ohmori, A

A method is described of controlling an automatic clutch when starting to move a vehicle having an engine and an automatic transmission with an input shaft, comprising the steps of : (a) detecting the extent of clutch engagement, the r.p.m. of the engine, and the r.p.m. of the input shaft of the vehicle; (b) searching for an engine r.p.m. reference value corresponding to the extent of clutch engagement detected in step (a) from a prescribed map data; (c) comparing the r.p.m. of the engine detected in step (a) with the engine r.p.m. reference value searched in step (b); (d) dropping the operation speed of a clutch actuator to zero to interrupt the application of the clutch, when the engine r.p.m. detected in step (a) is smaller than the engine r.p.m. reference value searched in step (b); (e) determining the operating speed of the clutch actuator, when the engine r.p.m. detected in step (a) exceeds the engine r.p.m. reference value searched in step (b); (f) replacing a maximum engine r.p.m. which has ever been reached with the engine r.p.m. which is detected in step (a), when the engine r.p.m. detected exceeds the maximum engine r.p.m.; (g) comparing the difference between the maximum engine r.p.m. and the engine r.p.m. detected in step (a) with a predetermined value; (h) operating the clutch actuator at the operation speed determined in step (e), when the difference is smaller than the predetermined value; and (i) dropping the operating speed of the clutch actuator to zero to interrupt the application of the clutch, when the difference is greater than the predetermined value.

• Assignee: Izuzu Motors Limited, Tokyo
• Patent Number(s): US 4685062
• OSTI ID: 6201588
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
ENGINES
EQUIPMENT
MACHINE PARTS
MAPS
MECHANICAL TRANSMISSIONS
MOTION
ROTATION
SHAFTS
SPEED REGULATORS
START-UP
VEHICLES
VELOCITY