CONTROL DEVICE OF AUTOMATIC TRANSMISSION, AND CONTROL METHOD OF AUTOMATIC TRANSMISSION
First Claim
1. A control device of an automatic transmission comprising a rotation transmission mechanism for transmitting the rotation of a prime mover mounted on a vehicle to a transmission mechanism, and an input clutch for controlling to connect and disconnect the rotation transmitted from the rotation transmission mechanism,the control device including a control means that causes the fluid pressure for the input clutch to be reduced, and executes the neutral control of bringing the input clutch in an engagement state into a half-engagement state, in a case where the vehicle is in a stopped state, and the control means executing the in-neutral control of maintaining the half-engagement state of the input clutch during the neutral control,wherein the control device further includes a differential rotation detecting means that detects differential rotation between the input-side engine speed and output-side rotating speed of the rotation transmission mechanism, andwherein the control means causes the fluid pressure for the input clutch to be reduced in a case where the differential rotation detected by the differential rotation detecting means has exceeded a preset differential rotation threshold value in a state where the control for holding the fluid pressure for the input clutch at a fixed pressure is started in order to maintain the half-engagement state of the input clutch during the in-neutral control.
1 Assignment
0 Petitions
Accused Products
Abstract
ECU executes in-neutral control in a case where a first clutch is brought into a half-engagement state on the basis of execution of neutral control. During the in-neutral control, ECU detects engine speed and input-shaft rotating speed, and detects differential rotation before an oil pressure change. Subsequently, in a case where the differential rotation before an oil pressure change detected by ECU has exceeded a first differential rotation threshold value, the operating oil pressure for a hydraulic servo is reduced by the first oil pressure.
27 Citations
14 Claims
-
1. A control device of an automatic transmission comprising a rotation transmission mechanism for transmitting the rotation of a prime mover mounted on a vehicle to a transmission mechanism, and an input clutch for controlling to connect and disconnect the rotation transmitted from the rotation transmission mechanism,
the control device including a control means that causes the fluid pressure for the input clutch to be reduced, and executes the neutral control of bringing the input clutch in an engagement state into a half-engagement state, in a case where the vehicle is in a stopped state, and the control means executing the in-neutral control of maintaining the half-engagement state of the input clutch during the neutral control, wherein the control device further includes a differential rotation detecting means that detects differential rotation between the input-side engine speed and output-side rotating speed of the rotation transmission mechanism, and wherein the control means causes the fluid pressure for the input clutch to be reduced in a case where the differential rotation detected by the differential rotation detecting means has exceeded a preset differential rotation threshold value in a state where the control for holding the fluid pressure for the input clutch at a fixed pressure is started in order to maintain the half-engagement state of the input clutch during the in-neutral control.
-
10. A control method of an automatic transmission including a rotation transmission mechanism for transmitting the rotation of a prime mover mounted on a vehicle to a transmission mechanism, and an input clutch for controlling to connect and disconnect the rotation transmitted from the rotation transmission mechanism, and
the method executing the neutral control of bringing the input clutch in an engagement state into a half-engagement state, when the vehicle is in a stopped state, the method comprising: -
a release operation of executing the release control that causes the fluid pressure for the input clutch to be reduced in order to bring the input clutch in an engagement state into a half-engagement state when the vehicle is in a stopped state; an in-neutral operation of confirming whether or not the input clutch is in a half-engagement state after the execution of the release operation, and of executing the in-neutral control of causing the fluid pressure for the input clutch to be held at a fixed pressure in a case where it is confirmed that the input clutch is in a half-engagement state; and a fluid-pressure reducing operation of detecting differential rotation between the input-side engine speed and the output-side rotating speed of the rotation transmission mechanism during execution of the control that holds the fluid pressure for the input clutch at a fixed pressure during the in-neutral control, and of causing the fluid pressure for the input clutch to be reduced in a case where the detected result has exceeded a preset differential rotation threshold value. - View Dependent Claims (11, 13, 14)
-
Specification