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US 9,810,319 B2Granted
Control apparatus for automatic transmission
AssigneeHonda Motor Co., Ltd.
InventorsMasato Shigenaga, Yusuke Yoshimura
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AssigneeHonda Motor Co., Ltd.
InventorsMasato Shigenaga, Yusuke Yoshimura
Estimating the term…
In an apparatus for controlling an automatic transmission connected to a prime mover mounted on a vehicle, having a torque converter equipped with a lock-up clutch, when predetermined operating conditions of the vehicle are satisfied at drive-off, a lock-up clutch engaging circuit is formed through a hydraulic supply circuit. Next it is determined whether engage-position sticking malfunction of the lock-up clutch has occurred based on a ratio of an input rotational speed of the automatic transmission relative to an output rotational speed of the prime mover and a change rate of the output rotational speed of the prime mover when the lock-up clutch engaging circuit has been formed, and fail-safe control is then implement when the sticking is determined.
An apparatus for controlling an automatic transmission that is connected to a prime mover mounted on a vehicle and changes speed of rotation of the prime mover to transmit the speed of rotation to driven wheels, having a torque converter interposed between the prime mover and the automatic transmission and equipped with a lock-up clutch, a hydraulic supply circuit that supplies hydraulic pressure to the lock-up clutch and the automatic transmission, and a controller that controls operation of the lock-up clutch and the automatic transmission through the hydraulic supply circuit, comprising:
A method for controlling an automatic transmission connected to a prime mover mounted on a vehicle through a torque converter, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid…
Control of torque converter lock-up clutches: using electric control means
Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures: adapting to failures or work around with other…
Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures: bringing the control into a predefined state,…
About 9 years 8 months of term left · ends 21 Jun 2036 (estimated)
This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2014-145895 filed on Jul. 16, 2014, the contents of which are incorporated herein by reference.
Field of the Invention
This invention relates to a control apparatus for an automatic transmission, more specifically to a control apparatus for an automatic transmission that can reliably detect or determine malfunction of a torque converter lock-up clutch and implement appropriate fail-safe control when malfunction is determined.
The above and other objects and advantages will be more apparent from the following description and drawings in which:
FIG. 1 is an overall schematic view of a control apparatus for an automatic transmission according to an embodiment of this invention;
FIG. 2 is a hydraulic circuit diagram concretely illustrating part of the structure of the hydraulic pressure supply circuit shown in FIG. 1;
A control apparatus for an automatic transmission according to an embodiment of this invention will be explained with reference to the attached drawings in the following.
FIG. 1 is an overall schematic view of a control apparatus for an automatic transmission according to an embodiment of this invention.
Reference numeral 1 in FIG. 1 designates a vehicle equipped with an automatic transmission (called “transmission” hereinafter) T. The transmission T is a twin-clutch (double-clutch) transmission with 8 forward-speed and 1 reverse-speed gears and has P, R, N and D ranges, for example.