US 11,739,835 B2Granted

Control device and control method of continuously variable transmission

AssigneeHonda Motor Co., Ltd.

InventorsNorihiro Akiyoshi, Kohei Sakai

Life of this patent

Estimating the term…

Loading patent…

Abstract

Disclosed is lateral pressure control of a continuously variable transmission (CVT) with a transmission ratio changed by changing groove widths of a drive pulley and a driven pulley, a drive force from a drive source being transmitted to a wheel. A control part controlling respective lateral pressures of the drive pulley and the driven pulley is provided. The control part sets an increase correction amount of the lateral pressure of the drive pulley to a first lateral pressure increase correction amount if the CVT is not in an in-gear state or a shift position is consistent with a traveling direction of the vehicle, and, sets said amount to a second lateral pressure increase correction amount smaller than the first lateral pressure increase correction amount if the CVT is in the in-gear state and the shift position is not consistent with the traveling direction of the vehicle.

Claims6

Dependent claims

A control device of a continuously variable transmission, which is a lateral pressure control device of the continuously variable transmission in a vehicle in which the continuously variable transmission is mounted, wherein the continuously variable transmission comprises a drive pulley, a driven pulley, and a belt wound on the drive pulley and the driven pulley, a transmission ratio is changed by changing groove widths of the drive pulley and the driven pulley, and a drive force from a drive source is transmitted to a wheel, the control device having:

a first lateral pressure generation circuit, generating a lateral pressure of the drive pulley;
a second lateral pressure generation circuit, generating a lateral pressure of the driven pulley;
and
a control part controlling the first lateral pressure generation circuit and the second lateral pressure generation circuit and controlling the respective lateral pressures of the drive pulley and the driven pulley,
wherein the controller is configured to:
in a case where the continuously variable transmission is not in an in-gear state and a shift position is inconsistent with a traveling direction of the vehicle, set an increase correction amount of the lateral pressure of the drive pulley to a first lateral pressure increase correction amount, and
in a case where the continuously variable transmission is in the in-gear state and the shift position is not consistent with the traveling direction of the vehicle, set the increase correction amount of the lateral pressure of the drive pulley to a second lateral pressure increase correction amount,
the second lateral pressure increase correction amount being smaller than the first lateral pressure increase correction amount.

5 more elements

A control method of a continuously variable transmission, which is a lateral pressure control method of the continuously variable transmission in a vehicle in which the continuously variable transmission is mounted, wherein the continuously variable transmission comprises a drive pulley, a driven pulley, and a belt wound on the drive pulley and the driven pulley, a transmission ratio is changed by changing groove widths of the drive pulley and the driven pulley, and a drive force from a drive source is transmitted to a wheel, the control method comprising:

by a control part controlling respective lateral pressures of the drive pulley and the driven pulley,
detecting an in-gear state of the continuously variable transmission, a shift position, and a traveling direction of the vehicle;
in a case where the continuously variable transmission is not in the in-gear state and the shift position is not consistent with the traveling direction of the vehicle, setting an increase correction amount of the lateral pressure of the drive pulley to a first lateral pressure increase correction amount;
and
in a case where the continuously variable transmission is in the in-gear state and the shift position is not consistent with the traveling direction of the vehicle, setting the increase correction amount of the lateral pressure of the drive pulley to a second lateral pressure increase correction amount,
the second lateral pressure increase correction amount being smaller than the first lateral pressure increase correction amount.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/680,261Filed 24 Feb 2022
Priority: JP 2021-07221221 Apr 2021
Published: US 2022/0381338 A11 Dec 2022
Granted: 29 Aug 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 61/66272
With endless flexible members: characterised by means for controlling the torque transmitting capability of the gearing
F16H 61/0031
Supply of control fluid; Pumps therefor: using auxiliary pumps, e.g. pump driven by a different power source than the engine
F16H 61/66259
Controlling of shifting being influenced by a signal derived from the engine and the main coupling: using electrical or electronical sensing or…
F16H 2059/704
Dependent on the ratio established: monitoring gear ratio in CVT's