CN107255150B

CN107255150B - Method for preventing impact generated when hydraulic torque converter is opened to locked

Info

Publication number: CN107255150B
Application number: CN201710665953.3A
Authority: CN
Inventors: 许永信; 戴振坤; 刘强; 曹永�; 郭太民; 侯可明
Original assignee: Shengrui Transmission Co Ltd
Current assignee: Shengrui Transmission Co Ltd
Priority date: 2017-08-07
Filing date: 2017-08-07
Publication date: 2020-09-08
Anticipated expiration: 2037-08-07
Also published as: CN107255150A

Abstract

The invention discloses a method for preventing a hydraulic torque converter from generating impact from opening to locking, wherein an automatic gearbox is in a sliding working condition, the torque of an engine is increased before the hydraulic torque converter is locked, a locking clutch of the hydraulic torque converter starts to build oil pressure in response to a locking command oil pressure, the rotating speed of the engine is increased along with the increase of the torque of the engine, the locking command oil pressure of the hydraulic torque converter is matched, so that the rotating speed of the engine is increased under the action of the increased engine torque, when the absolute value of the difference value between the rotating speed of the engine and the rotating speed of an input shaft of the gearbox is smaller than N, the locking clutch completes the locking of the hydraulic torque converter, and the hydraulic torque converter enters a; the engine speed is smoothly increased through the engine torque-up, and the impact generated when the state of the hydraulic torque converter is from open to closed is eliminated by matching the control of the closing command oil pressure of the hydraulic torque converter.

Description

Method for preventing impact generated when hydraulic torque converter is opened to locked

Technical Field

The invention relates to a method for preventing a torque converter from generating impact from opening to locking.

Background

The automatic gearbox with the hydraulic torque converter needs the hydraulic torque converter to support the engine reversely under the sliding working condition for saving oil, and the condition that the rotating speed of the engine is reduced to trigger oil-cut recovery is prevented.

If the torque converter is open during coasting, the engine speed may gradually transition to near the target idle speed, which may result in the engine reaching less than the fuel cut speed or triggering a fuel cut to resume speed without fuel cut. At the moment, the hydraulic torque converter is required to act on the engine in a reverse mode through locking, the engine is supported to rotate in a reverse mode, the rotating speed of the engine is kept above the oil-cut recovery rotating speed all the time, and therefore the maximum oil-cut interval is guaranteed.

In the open-door sliding condition, during the process of the hydraulic torque converter from opening to locking, the engine reacts on the hydraulic torque converter, and the actual oil pressure of the hydraulic torque converter locking is delayed relative to the command oil pressure, so that the engine speed cannot be pulled up in the first half part of the oil filling of the hydraulic torque converter, and the engine speed rapidly rises in the second half part of the oil filling, and the continuous impact or the suspension of the whole vehicle is caused, as shown in fig. 2.

At present, the automatic gearbox vehicle has no evasive measures for the problem on software; in terms of hardware, a butterfly spring is added to a hydraulic torque converter locking clutch of a part of traditional gearboxes to absorb impact generated when the rotating speed of an engine suddenly rises.

The torque converter lock-up clutch has the following disadvantages that the addition of the disc spring to the continuous shock generated when the state of the torque converter changes:

the method comprises the following steps that (I) parts of the hydraulic torque converter are increased, the risk of failure of a gearbox is increased, the hydraulic torque converter is scrapped due to failure of a butterfly spring, and even the whole gearbox fails due to lubricating oil;

(ii) the cost of the gearbox increases.

Disclosure of Invention

In order to make up for the defects, the invention provides a method for preventing the impact generated when the hydraulic torque converter is opened to locked, which can effectively eliminate the impact generated when the hydraulic torque converter is opened to locked under the sliding working condition of the gearbox and effectively simplifies the structure of the hydraulic torque converter.

The technical scheme of the invention is as follows: a method for preventing the hydraulic torque converter from generating impact from opening to locking is characterized in that an automatic gearbox is in a sliding working condition, the torque of an engine is increased before the hydraulic torque converter is locked, a locking clutch of the hydraulic torque converter starts to build oil pressure in response to a locking command oil pressure, the rotating speed of the engine is increased along with the increase of the torque of the engine, the locking clutch is matched with the locking command oil pressure of the hydraulic torque converter to enable the rotating speed of the engine to be increased under the action of the increased engine torque, when the absolute value of the difference value between the rotating speed of the engine and the rotating speed of an input shaft of the gearbox is smaller than N, the locking clutch completes locking of the hydraulic torque converter, and.

As a preferable mode, the lockup clutch starts to build the oil pressure in response to the lockup command oil pressure after the engine increases the torque.

Preferably, the lockup clutch starts to build the oil pressure in response to the lockup command oil pressure while the engine increases torque.

Preferably, the lock-up clutch begins to build oil pressure in response to the lock-up command before the engine increases torque.

As a preferred technical scheme, N is a calibratable value.

The transmission with the hydrodynamic torque converter is preferably applied to a transmission with the hydrodynamic torque converter.

Preferably, the gearbox with the hydraulic torque converter comprises an AT gearbox with the hydraulic torque converter, a CVT gearbox, a DCT gearbox and an AMT gearbox.

Due to the adoption of the technical scheme, the method for preventing the hydraulic torque converter from generating impact from opening to locking comprises the steps that when the automatic gearbox is in a sliding working condition, the torque of an engine is increased before the hydraulic torque converter is locked, the oil pressure is built by a locking clutch of the hydraulic torque converter in response to a locking command oil pressure, the rotating speed of the engine is increased along with the increase of the torque of the engine, the rotating speed of the engine is increased under the action of the increased torque of the engine by matching with the locking command oil pressure of the hydraulic torque converter, when the absolute value of the difference value between the rotating speed of the engine and the rotating speed of an input shaft of the gearbox is smaller than N, the locking clutch completes the locking of the hydraulic torque converter; the engine speed is smoothly increased through the engine torque-up, and the impact generated when the state of the hydraulic torque converter is from open to closed is eliminated by matching the control of the closing command oil pressure of the hydraulic torque converter.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of the present invention;

fig. 2 is a schematic diagram of the prior art.

Detailed Description

As shown in FIG. 1, a method for preventing the torque converter from generating impact from opening to locking is provided, wherein an automatic gearbox is in a coasting working condition, the torque converter increases the engine torque before locking, the locking clutch of the torque converter starts to build up the oil pressure in response to the locking command oil pressure, the engine rotating speed is increased along with the increase of the engine torque, the locking command oil pressure of the torque converter is matched, the engine rotating speed is increased under the action of the increased engine torque, when the absolute value of the difference value between the engine rotating speed and the rotating speed of an input shaft of the gearbox is smaller than N, the locking clutch completes locking of the torque converter, and the torque converter enters a locking state. And N is a calibratable value.

Preferably, as shown in fig. 1, torque is increased at the engine at time T1 while the lockup clutch begins to build oil pressure in response to the lockup command oil pressure.

Alternatively, the lockup clutch may start to build oil pressure in response to the lockup command oil pressure after the engine increases torque.

It is also possible that the lock-up clutch begins to build oil pressure in response to a lock-up command before the engine increases torque.

In order to realize that the rotating speed of the engine is smoothly increased by the torque-up of the engine and eliminate the impact generated when the state of the hydraulic torque converter is from open to closed by matching with the control of the locking command oil pressure of the hydraulic torque converter; the specific time interval between when the lockup clutch begins to build oil pressure and when the engine increases torque may be determined by one of ordinary skill in the art based on experimental or theoretical calculations, etc.

The method for preventing the impact generated when the hydraulic torque converter is locked from being opened is applied to the gearbox with the hydraulic torque converter.

The gearbox with the hydraulic torque converter comprises an AT gearbox with the hydraulic torque converter, a CVT gearbox, a DCT gearbox and an AMT gearbox.

The engine speed is smoothly increased through the engine torque-up, and the impact generated when the state of the hydraulic torque converter is from open to closed is eliminated by matching the control of the closing command oil pressure of the hydraulic torque converter.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A method of preventing a torque converter from opening to lockup from shock, comprising: the method comprises the following steps that under the working condition that an automatic gearbox slides when an accelerator is released, engine torque is increased before locking of a hydraulic torque converter, a locking clutch of the hydraulic torque converter responds to locking command oil pressure to start building oil pressure, the rotating speed of an engine is increased along with the increase of the engine torque, the locking command oil pressure of the hydraulic torque converter is matched, the rotating speed of the engine is increased under the action of the increased engine torque, when the absolute value of the difference value between the rotating speed of the engine and the rotating speed of an input shaft of the gearbox is smaller than N, the locking clutch finishes locking of the hydraulic torque converter, and the hydraulic torque converter enters a locking; at time T1 the engine increases torque while the lockup clutch begins to build oil pressure in response to the lockup command oil pressure.

2. The method of preventing torque converter lockup from opening to lockup as recited in claim 1 wherein N is a calibratable value.

3. The method of preventing torque converter lockup from opening to stroking as recited in claim 1 wherein the transmission is an AT transmission, CVT transmission, DCT transmission or AMT transmission.