Two stage kickdown control system for a motor vehicle automatic transmission

Patent · Tue Jan 14 00:00:00 EST 1986

OSTI ID:6068212

Higashi, H; Waki, K; Fukuiri, M; Yukitomo, K

This patent describes a vehicle automatic transmission including a hydraulic torque converter and a transmission gear mechanism connected with the torque converter and having at least three gear stages of different gear ratios for forward drive. A principal feature of this system as described is a friction means for selecting one of the gear stages as well as a kickdown control means consisting of the first shift down circuit means for control of the friction means so that the transmission gear mechanism is shifted downward. A solenoid kick down means within the modality of the first shift down circuit and a kick down switch means actuated by an engine control member when it is moved to a full power position provides control of the kick down solenoid and the effecting of a down shift. The shift down control means is composed of a second shift down circuit means for controlling the friction means so shift down occurs. The shift down solenoid contained in the second shift down circuit means in conjunction with a shift down switch actuated by engine control member movement to a position spaced a predetermined distance from the full power position control the shift down solenoid to effect a shift down. Thus this mechanism is actuated earlier than the kickdown switch means when the engine control member is moved toward the full power position. A time delay means from the time of actuation of the shift down switch means and controlling kickdown switch activation is also described.

• Assignee: Mazda Motor Corp., Hiroshima
• Patent Number(s): US 4563917
• OSTI ID: 6068212
• Resource Relation: Patent File Date: Filed date 28 Sep 1984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
GEARS
CONTROL SYSTEMS
MECHANICAL TRANSMISSIONS
VEHICLES
FRICTION
HYDRAULICS
INCIDENCE ANGLE
SOLENOIDS
SPACE DEPENDENCE
SWITCHES
TIME DELAY
TORQUE
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLUID MECHANICS
MACHINE PARTS
MECHANICS
330602* - Vehicle Design Factors- Engine-Transmission Matching