CN112161051B - Hydraulic torque converter lockup clutch slip wear compensation control device and control method - Google Patents

Hydraulic torque converter lockup clutch slip wear compensation control device and control method Download PDF

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Publication number
CN112161051B
CN112161051B CN202011106498.1A CN202011106498A CN112161051B CN 112161051 B CN112161051 B CN 112161051B CN 202011106498 A CN202011106498 A CN 202011106498A CN 112161051 B CN112161051 B CN 112161051B
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torque converter
lockup clutch
valve
oil
hydraulic torque
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CN112161051A (en
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刘金刚
郑剑云
傅兵
赵又红
戴诗雨
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Xiangtan University
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Xiangtan University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/14—Control of torque converter lock-up clutches
    • F16H61/143—Control of torque converter lock-up clutches using electric control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/14—Control of torque converter lock-up clutches
    • F16H61/143—Control of torque converter lock-up clutches using electric control means
    • F16H2061/145—Control of torque converter lock-up clutches using electric control means for controlling slip, e.g. approaching target slip value

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

The invention discloses a slip wear loss compensation control device and a slip wear loss compensation control method for a lockup clutch of a hydraulic torque converter, wherein the device comprises the hydraulic torque converter, a hydraulic device and an electronic control unit; a torque sensor and a rotating speed sensor are arranged at the input shaft and the output shaft of the hydraulic torque converter, and a pressure sensor is arranged between the lockup clutch and the hydraulic torque converter shell; the hydraulic device comprises an oil tank, a small oil pump, a large oil pump, an overflow valve, a three-position four-way reversing valve, a stroke valve, a one-way valve and an electromagnetic valve; the torque sensor, the rotating speed sensor, the pressure sensor, the three-position four-way reversing valve, the stroke valve, the one-way valve II and the electromagnetic valve are respectively connected with the electronic control unit. The invention has simple structure and high control precision, and can realize the quick switching of the locking and unlocking working conditions of the locking clutch of the hydraulic torque converter; the time of the lockup clutch under the sliding friction working condition is shortened, and the sliding friction loss of the lockup clutch is reduced.

Description

Hydraulic torque converter lockup clutch slip wear compensation control device and control method
Technical Field
The invention belongs to the technical field of clutch control, and particularly relates to a slip wear compensation control device and a slip wear compensation control method for a lockup clutch of a hydraulic torque converter.
Background
The locking slip control technology for the hydraulic torque converter is characterized in that a controllable clutch is installed between a turbine and a pump wheel of the hydraulic torque converter, when an automobile runs to a set working condition, the locking clutch is controlled to lock the turbine and the pump wheel into a whole, the hydraulic torque converter is changed from hydraulic transmission to rigid transmission, and the application of the locking control technology greatly improves the transmission efficiency of the automobile. However, the lockup clutch is not instantaneously completed from the disengaged condition to the engaged condition or from the engaged condition to the disengaged condition, and a slip process exists. The existing hydraulic torque converter device with the lockup clutch does not fully consider the abrasion of the lockup clutch in the sliding process, particularly when the running condition is complex and the lockup and unlocking times of the lockup clutch are increased, the time of the lockup clutch in the sliding working condition is prolonged, and finally a friction pair of the lockup clutch generates large sliding friction work which has important influence on the temperature change of the lockup clutch.
Disclosure of Invention
In order to solve the technical problems, the invention provides a slip wear compensation control device and a slip wear compensation control method for a lockup clutch of a hydraulic torque converter, which have the advantages of simple structure and high control precision, realize the quick switching of the lockup and unlock working conditions of the lockup clutch of the hydraulic torque converter, shorten the time of the lockup clutch in the slip wear working condition and reduce the slip wear of the lockup clutch.
The technical scheme adopted by the invention is as follows:
a slip friction loss compensation control method for a lockup clutch of a hydraulic torque converter is realized by using a slip friction loss compensation control device of the lockup clutch of the hydraulic torque converter, wherein the slip friction loss compensation control device of the lockup clutch of the hydraulic torque converter comprises the hydraulic torque converter, a hydraulic device and an electronic control unit; a torque sensor and a rotating speed sensor are arranged at the input shaft and the output shaft of the hydraulic torque converter, and a pressure sensor is arranged between the lockup clutch and the hydraulic torque converter shell; the hydraulic device comprises an oil tank, a small oil pump, a large oil pump, an overflow valve, a three-position four-way reversing valve, a stroke valve, a one-way valve I, a one-way valve II and an electromagnetic valve; the inlets of the large oil pump and the small oil pump are respectively communicated with an oil tank; the outlet of the small oil pump is communicated with a P port of the three-position four-way reversing valve through an oil inlet pipe, the oil inlet pipe is connected with an oil inlet of an overflow valve through a pipeline, and an oil outlet of the overflow valve is connected with an oil tank; the oil outlet of the large oil pump is communicated with the oil inlet pipe through a pipeline; a one-way valve I is arranged on a pipeline for communicating an oil outlet of the large oil pump with an oil inlet pipe, and the one-way valve I is connected with the electronic control unit; the port A of the three-position four-way reversing valve is respectively connected with the oil inlet of the stroke valve, the oil outlet of the one-way valve II and the port T of the electromagnetic valve, and the port B of the three-position four-way reversing valve is connected with the port P of the electromagnetic valve; an oil outlet of the stroke valve and an oil inlet of the one-way valve II are connected with a locked oil inlet of the hydraulic torque converter, and an A port of the electromagnetic valve is connected with a locked oil outlet of the hydraulic torque converter; the torque sensor, the rotating speed sensor, the pressure sensor, the three-position four-way reversing valve, the stroke valve, the one-way valve II and the electromagnetic valve are respectively connected with the electronic control unit;
the specific operation is as follows:
when the lockup clutch enters a complete unlocking working condition from a complete lockup working condition, the method comprises the following steps:
(A) setting an unlock target slip ratio r of a torque converter0And unlock target torque ratio K0；
(B) Controlling unlocking slip ratio: the small oil pump is started, the electronic control unit controls the three-position four-way reversing valve to work at the right position, pressure oil output by the small oil pump is input to an unlocking pressure oil inlet of the hydraulic torque converter through a port B of the three-position four-way reversing valve and a port P of the electromagnetic valve, return oil of an unlocking pressure oil outlet of the hydraulic torque converter returns to an oil tank through a one-way valve II and a port T of the three-position four-way reversing valve, the hydraulic oil pressure at the separation end of the lockup clutch is continuously increased, and the lockup clutch is controlled to start to be far away from a shell of the hydraulic torque converter;
the electronic control unit measures the rotating speeds of the input shaft of the hydraulic torque converter and the output shaft of the hydraulic torque converter through a rotating speed sensor and calculates the actual slip ratio r ═ omega in real time1-ω2)/ω1In the formula: omega1As input shaft speed, ω2Is the output shaft speed;
real-time comparison of actual slip ratio r with unlocking target slip ratio r0Until the actual slip ratio r reaches the unlocking target slip ratio r of the lockup clutch of the torque converter0After the two are consistent, the locking clutch of the hydraulic torque converter is in a sliding abrasion working condition, and the next step is carried out;
(C) control of unlock torque ratio: the large oil pump is started, pressure oil output by the large oil pump is converged with pressure oil output by the small oil pump through the check valve I, the pressure oil is input to an unlocking pressure oil inlet of the hydraulic torque converter through a port B of the three-position four-way reversing valve and a port P of the electromagnetic valve, and return oil of an unlocking pressure oil outlet of the hydraulic torque converter returns to an oil tank through a check valve II and a port T of the three-position four-way reversing valve;
the electronic control unit measures the pressure value of the pressure on the friction element of the lockup clutch in real time through a pressure sensor between the lockup clutch and the shell of the hydraulic torque converter, and the electronic control unit measures the pressure value of the pressure on the friction element of the lockup clutch in real time through a rotating speed sensorMeasuring the rotating speed of the input shaft of the hydraulic torque converter and the rotating speed of the output shaft of the hydraulic torque converter, and further calculating the torque T transmitted by the closed clutch in real timeT0Hemomokung W0Torque T transmitted by the lock-up clutchT0Hemomokung W0The calculation formula of (a) is as follows:
Figure GDA0003294272110000031
in the formula: omega1Is the input shaft speed; omega2Is the output shaft speed; rCIs the equivalent radius of the lockup clutch friction plate; rC1Is the inner diameter of a friction plate of the locking clutch; rC2The outer diameter of the friction plate of the locking clutch; μ is the lockup clutch dynamic friction factor, and has the value:
Figure GDA0003294272110000032
coefficient of static friction mu00.11; p is a pressing oil pressure value on a friction element of the lockup clutch;
Figure GDA0003294272110000041
in the formula: t is t1The time for the lockup clutch of the hydraulic torque converter to enter a slip condition; t is t2Time to achieve complete unlocking for the torque converter lockup clutch;
the electronic control unit collects the torque of the input shaft and the output shaft of the hydraulic torque converter in real time through the torque sensor, and then calculates the actual torque ratio K-T in real time1/T2，T1As input shaft torque, T2As the torque of the output shaft,
and comparing the actual torque ratio K with the unlocking target torque ratio K in real time0Until the actual torque ratio K and the unlock target torque ratio K0And if so, completing the complete unlocking of the lockup clutch of the hydraulic torque converter;
when the lockup clutch enters a complete lockup working condition from a complete unlock working condition, the method comprises the following steps:
(1) is provided withLocking target slip ratio r of fixed hydraulic torque converter1And a lockup target torque ratio K1；
(2) Control of the lockup slip ratio: closing the large oil pump, keeping the small oil pump open, and simultaneously controlling the three-position four-way reversing valve to work at a left position by the electronic control unit, so that pressure oil output by the small oil pump is input into an unlocking pressure oil outlet of the hydraulic torque converter through an opening A of the three-position four-way reversing valve and a stroke valve, return oil of an unlocking pressure oil inlet of the hydraulic torque converter enters the unlocking pressure oil outlet of the hydraulic torque converter again through an electromagnetic valve opening T and a stroke valve oil inlet, differential pressurization is realized, a compression oil pressure value on a friction element of the lockup clutch is controlled, and the lockup clutch is controlled to start to approach a shell of the hydraulic torque converter;
the electronic control unit measures the rotating speeds of the input shaft of the hydraulic torque converter and the output shaft of the hydraulic torque converter through a rotating speed sensor and calculates the actual slip ratio r in real time;
real-time comparison of actual slip ratio r with locked target slip ratio r1When the actual slip ratio r is equal to the lockup target slip ratio r of the lockup clutch of the torque converter1After the two are consistent, the locking clutch of the hydraulic torque converter is in a sliding abrasion working condition, and the next step is carried out;
(3) control of lockup torque ratio: increasing the output oil pressure of an oil pump, measuring a pressing oil pressure value on a friction element of a lockup clutch in real time by an electronic control unit through a pressure sensor between the lockup clutch and a shell of the hydraulic torque converter, measuring the rotating speeds of an input shaft of the hydraulic torque converter and an output shaft of the hydraulic torque converter in real time by an electronic control unit through a rotating speed sensor, and further calculating the torque T transmitted by the lockup clutch in real timeT1Hemomokung W1Torque T transmitted by the lock-up clutchT1Hemomokung W1The calculation formula of (a) is as follows:
Figure GDA0003294272110000051
in the formula: omega1Is the input shaft speed; omega2Is the output shaft speed; rCIs the equivalent radius of the lockup clutch friction plate; rC1Is the inner diameter of a friction plate of the locking clutch; rC2The outer diameter of the friction plate of the locking clutch; μ is the lockup clutch dynamic friction factor, and has the value:
Figure GDA0003294272110000052
coefficient of static friction mu0＝0.11；
Figure GDA0003294272110000053
In the formula: t is t1The time for the lockup clutch of the hydraulic torque converter to enter a slip condition; t is t2Time to achieve complete lockup for a torque converter lockup clutch;
the electronic control unit collects the torque of the input shaft and the output shaft of the hydraulic torque converter in real time through the torque sensor, and then calculates the actual torque ratio K-T in real time1/T2，T1As input shaft torque, T2As the torque of the output shaft,
and comparing the actual torque ratio K with the locked target torque ratio K in real time1When the actual torque ratio K is equal to the lock-up target torque ratio K1And completing the complete locking of the locking clutch of the hydraulic torque converter.
Compared with the prior art, the invention has the beneficial effects that:
the slip wear compensation control device of the lockup clutch of the hydraulic torque converter is accurate in real time and convenient to operate; the control strategy for locking and unlocking the lockup clutch of the hydraulic torque converter is provided according to the slip ratio and the torque ratio, the judgment criterion is simple, the control operation of locking and unlocking can be quickly judged and carried out when interference occurs, and the anti-interference performance is strong; the influence of the locking and unlocking times of the hydraulic torque converter on the sliding friction loss of the locking clutch is fully considered; the invention realizes the quick unlocking and locking of the hydraulic torque converter through the compensation device, reduces the slip time, can reduce the friction loss of the locking clutch and prolongs the service life of the locking clutch; the invention can realize the quick switching of the locking and unlocking working conditions of the locking clutch of the hydraulic torque converter on the whole and improve the transmission efficiency of the system.
Drawings
Fig. 1 is a schematic configuration diagram of a torque converter lockup clutch slip loss compensation control device according to the present invention.
FIG. 2 is a flow chart of a torque converter lockup clutch slip loss compensation control method of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the torque converter lockup clutch slip wear compensation control apparatus of the present invention includes a torque converter 19, a hydraulic device, and an electronic control unit 13; a torque sensor 14 and a rotating speed sensor 15 are arranged at the input shaft and the output shaft of the hydraulic torque converter 19, and a pressure sensor 18 is arranged between the lockup clutch and the hydraulic torque converter shell. The input shaft of the torque converter 19 is connected to the engine 12.
The hydraulic device comprises an oil tank 1, a small oil pump 3, a large oil pump 6, an overflow valve 4, a three-position four-way reversing valve 8, a stroke valve 11, a one-way valve I7, a one-way valve II 10 and an electromagnetic valve 9; inlets of the large oil pump 6 and the small oil pump 3 are respectively communicated with the oil tank 1, and a filter I2 is arranged on a pipeline connecting the small oil pump 3 and the oil tank; and a filter II 5 is arranged on a pipeline connecting the large oil pump 6 and the oil tank 1. The outlet of the small oil pump 3 is communicated with the P port of the three-position four-way reversing valve 8 through an oil inlet pipe; the oil outlet of the large oil pump 6 is communicated with the oil inlet pipe through a pipeline, and a one-way valve I7 is arranged on the pipeline connecting the large oil pump 6 and the oil inlet pipe. The oil inlet pipe is connected with an oil inlet of the overflow valve 4 through a pipeline, and an oil outlet of the overflow valve 4 is connected with the oil tank 1. The port A of the three-position four-way reversing valve 8 is connected with the oil inlet of the stroke valve 11, the oil outlet of the one-way valve II 10 and the port T of the electromagnetic valve 9 respectively, the port B of the three-position four-way reversing valve 11 is connected with the port P of the electromagnetic valve 9, and the port T of the three-position four-way reversing valve 11 is connected with the oil tank 1. An oil outlet of the stroke valve 11 and an oil inlet of the one-way valve II 10 are connected with a locking oil inlet C of the hydraulic torque converter, and an A port of the electromagnetic valve 9 is connected with a locking oil outlet D of the hydraulic torque converter. The torque sensor 14, the rotating speed sensor 15, the pressure sensor 18, the three-position four-way reversing valve 8, the stroke valve 11, the one-way valve I7, the one-way valve II 10 and the electromagnetic valve 9 are respectively connected with the electronic control unit 13.
As shown in fig. 2, the slip wear compensation control method for the lockup clutch of the torque converter of the present invention specifically operates as follows:
when the lockup clutch enters a complete unlocking working condition from a complete lockup working condition, the method comprises the following steps:
(A) setting an unlock target slip ratio r of a torque converter0And unlock target torque ratio K0；
(B) Controlling unlocking slip ratio: the small oil pump 3 is started, the electronic control unit 13 controls the three-position four-way reversing valve 8 to work at the right position, pressure oil output by the small oil pump 3 is input to an unlocking pressure oil inlet D of the hydraulic torque converter through a port B of the three-position four-way reversing valve and a port P of the electromagnetic valve 9, return oil of an unlocking pressure oil outlet C of the hydraulic torque converter returns to an oil tank through a one-way valve II 10 and a port T of the three-position four-way reversing valve 8, hydraulic oil pressure at the separation end of the lockup clutch is continuously increased, and the lockup clutch is controlled to start to be far away from a shell of the hydraulic torque converter;
the electronic control unit 13 measures the rotational speeds at the torque converter input shaft and the torque converter output shaft through the rotational speed sensors, and calculates the actual slip ratio r ═ ω (ω) in real time1-ω2)/ω1In the formula: omega1As input shaft speed, ω2Is the output shaft speed;
real-time comparison of actual slip ratio r with unlocking target slip ratio r0Until the actual slip ratio r reaches the unlocking target slip ratio r of the lockup clutch of the torque converter0After the two are consistent, the locking clutch of the hydraulic torque converter is in a sliding abrasion working condition, and the next step is carried out;
(C) control of unlock torque ratio: the large oil pump 6 is started, pressure oil output by the large oil pump 6 is converged with pressure oil output by the small oil pump through the check valve I, the pressure oil is input to an unlocking pressure oil inlet of the hydraulic torque converter through a port B of the three-position four-way reversing valve 8 and a port P of the electromagnetic valve 9, and return oil of an unlocking pressure oil outlet of the hydraulic torque converter returns to an oil tank through a check valve II 10 and a port T of the three-position four-way reversing valve 8;
the electronic control unit is connected with the shell of the hydraulic torque converter through the locking clutchThe pressure sensor measures the pressure oil pressure value on the friction element of the locking clutch in real time, the electronic control unit measures the rotating speed of the input shaft of the hydraulic torque converter and the rotating speed of the output shaft of the hydraulic torque converter in real time through the rotating speed sensor, and then calculates the torque T transmitted by the unlocking clutch in real timeT0Hemomokung W0Moment T transmitted by the unlocking clutchT0Hemomokung W0The calculation formula of (a) is as follows:
Figure GDA0003294272110000081
in the formula: omega1Is the input shaft speed; omega2Is the output shaft speed; rCIs the equivalent radius of the lockup clutch friction plate; rC1Is the inner diameter of a friction plate of the locking clutch; rC2The outer diameter of the friction plate of the locking clutch; μ is the lockup clutch dynamic friction factor, and has the value:
Figure GDA0003294272110000082
coefficient of static friction mu00.11; p is a pressing oil pressure value on a friction element of the lockup clutch;
Figure GDA0003294272110000083
in the formula: t is t1The time for the lockup clutch of the hydraulic torque converter to enter a slip condition; t is t2Time to achieve complete unlocking for the torque converter lockup clutch;
the electronic control unit collects the torque of the input shaft and the output shaft of the hydraulic torque converter in real time through the torque sensor, and then calculates the actual torque ratio K-T in real time1/T2，T1As input shaft torque, T2As the torque of the output shaft,
and comparing the actual torque ratio K with the unlocking target torque ratio K in real time0Until the actual torque ratio K and the unlock target torque ratio K0And if so, completing the complete unlocking of the lockup clutch of the hydraulic torque converter;
when the lockup clutch enters a complete lockup working condition from a complete unlock working condition, the method comprises the following steps:
(1) setting a lockup target slip ratio r of a torque converter1And a lockup target torque ratio K1；
(2) Control of the lockup slip ratio: the large oil pump 6 is closed, the small oil pump 3 is kept to be started, meanwhile, the electronic control unit controls the three-position four-way reversing valve 8 to work at the left position, so that pressure oil output by the small oil pump 3 is input into an unlocking pressure oil outlet C of the hydraulic torque converter through an opening A of the three-position four-way reversing valve 8 and a stroke valve, return oil of an unlocking pressure oil inlet D of the hydraulic torque converter enters the unlocking pressure oil outlet C of the hydraulic torque converter again through a T opening of the electromagnetic valve 9 and an oil inlet of the stroke valve, differential pressurization is realized, a compression oil pressure value on a friction element of the lockup clutch is controlled, and the lockup clutch is controlled to start to approach a shell of the hydraulic torque converter;
the electronic control unit measures the rotating speeds of the input shaft of the hydraulic torque converter and the output shaft of the hydraulic torque converter through a rotating speed sensor and calculates the actual slip ratio r in real time;
real-time comparison of actual slip ratio r with locked target slip ratio r1When the actual slip ratio r is equal to the lockup target slip ratio r of the lockup clutch of the torque converter1After the two are consistent, the locking clutch of the hydraulic torque converter is in a sliding abrasion working condition, and the next step is carried out;
(3) control of lockup torque ratio: increasing the output oil pressure of an oil pump, measuring a pressing oil pressure value on a friction element of a lockup clutch in real time by an electronic control unit through a pressure sensor between the lockup clutch and a shell of the hydraulic torque converter, measuring the rotating speeds of an input shaft of the hydraulic torque converter and an output shaft of the hydraulic torque converter in real time by an electronic control unit through a rotating speed sensor, and further calculating the torque T transmitted by the lockup clutch in real timeT1Hemomokung W1Torque T transmitted by the lock-up clutchT1Hemomokung W1The calculation formula of (a) is as follows:
Figure GDA0003294272110000091
in the formula: omega1Is the input shaft speed; omega2Is the output shaft speed; rCIs the equivalent radius of the lockup clutch friction plate; rC1Is the inner diameter of a friction plate of the locking clutch; rC2The outer diameter of the friction plate of the locking clutch; μ is the lockup clutch dynamic friction factor, and has the value:
Figure GDA0003294272110000092
coefficient of static friction mu0＝0.11；
Figure GDA0003294272110000093
In the formula: t is t1The time for the lockup clutch of the hydraulic torque converter to enter a slip condition; t is t2Time to achieve complete lockup for a torque converter lockup clutch;
the electronic control unit collects the torque of the input shaft and the output shaft of the hydraulic torque converter in real time through the torque sensor, and then calculates the actual torque ratio K-T in real time1/T2，T1As input shaft torque, T2As the torque of the output shaft,
and comparing the actual torque ratio K with the locked target torque ratio K in real time1When the actual torque ratio K is equal to the lock-up target torque ratio K1And completing the complete locking of the locking clutch of the hydraulic torque converter.

Claims (1)

1. A slip friction loss compensation control method for a lockup clutch of a hydraulic torque converter is realized by using a slip friction loss compensation control device of the lockup clutch of the hydraulic torque converter, wherein the slip friction loss compensation control device of the lockup clutch of the hydraulic torque converter comprises the hydraulic torque converter, a hydraulic device and an electronic control unit; a torque sensor and a rotating speed sensor are arranged at the input shaft and the output shaft of the hydraulic torque converter, and a pressure sensor is arranged between the lockup clutch and the hydraulic torque converter shell; the hydraulic device comprises an oil tank, a small oil pump, a large oil pump, an overflow valve, a three-position four-way reversing valve, a stroke valve, a one-way valve I, a one-way valve II and an electromagnetic valve; the inlets of the large oil pump and the small oil pump are respectively communicated with an oil tank; the outlet of the small oil pump is communicated with a P port of the three-position four-way reversing valve through an oil inlet pipe, the oil inlet pipe is connected with an oil inlet of an overflow valve through a pipeline, and an oil outlet of the overflow valve is connected with an oil tank; the oil outlet of the large oil pump is communicated with the oil inlet pipe through a pipeline; a one-way valve I is arranged on a pipeline for communicating an oil outlet of the large oil pump with an oil inlet pipe, and the one-way valve I is connected with the electronic control unit; the port A of the three-position four-way reversing valve is respectively connected with the oil inlet of the stroke valve, the oil outlet of the one-way valve II and the port T of the electromagnetic valve, and the port B of the three-position four-way reversing valve is connected with the port P of the electromagnetic valve; an oil outlet of the stroke valve and an oil inlet of the one-way valve II are connected with a locked oil inlet of the hydraulic torque converter, and an A port of the electromagnetic valve is connected with a locked oil outlet of the hydraulic torque converter; the torque sensor, the rotating speed sensor, the pressure sensor, the three-position four-way reversing valve, the stroke valve, the one-way valve II and the electromagnetic valve are respectively connected with the electronic control unit;
the specific operation is as follows:
when the lockup clutch enters a complete unlocking working condition from a complete lockup working condition, the method comprises the following steps:
(A) setting an unlock target slip ratio r of a torque converter0And unlock target torque ratio K0；
(B) Controlling unlocking slip ratio: the small oil pump is started, the electronic control unit controls the three-position four-way reversing valve to work at the right position, pressure oil output by the small oil pump is input to an unlocking pressure oil inlet of the hydraulic torque converter through a port B of the three-position four-way reversing valve and a port P of the electromagnetic valve, return oil of an unlocking pressure oil outlet of the hydraulic torque converter returns to an oil tank through a one-way valve II and a port T of the three-position four-way reversing valve, the hydraulic oil pressure at the separation end of the lockup clutch is continuously increased, and the lockup clutch is controlled to start to be far away from a shell of the hydraulic torque converter;
the electronic control unit measures the rotating speeds of the input shaft of the hydraulic torque converter and the output shaft of the hydraulic torque converter through a rotating speed sensor and calculates the actual slip ratio r ═ omega in real time1-ω2)/ω1In the formula: omega1As input shaft speed, ω2Is the output shaft speed;
real-time comparison of actual slip ratio r with unlocking target slip ratior0Until the actual slip ratio r reaches the unlocking target slip ratio r of the lockup clutch of the torque converter0After the two are consistent, the locking clutch of the hydraulic torque converter is in a sliding abrasion working condition, and the next step is carried out;
(C) control of unlock torque ratio: the large oil pump is started, pressure oil output by the large oil pump is converged with pressure oil output by the small oil pump through the check valve I, the pressure oil is input to an unlocking pressure oil inlet of the hydraulic torque converter through a port B of the three-position four-way reversing valve and a port P of the electromagnetic valve, and return oil of an unlocking pressure oil outlet of the hydraulic torque converter returns to an oil tank through a check valve II and a port T of the three-position four-way reversing valve;
the electronic control unit measures a pressing oil pressure value on a friction element of the lockup clutch in real time through a pressure sensor between the lockup clutch and a shell of the hydraulic torque converter, measures the rotating speeds of an input shaft of the hydraulic torque converter and an output shaft of the hydraulic torque converter in real time through a rotating speed sensor, and further calculates torque T transmitted by the lockup clutch in real timeT0Hemomokung W0Torque T transmitted by the lock-up clutchT0Hemomokung W0The calculation formula of (a) is as follows:
Figure FDA0003294272100000021
in the formula: omega1Is the input shaft speed; omega2Is the output shaft speed; rCIs the equivalent radius of the lockup clutch friction plate; rC1Is the inner diameter of a friction plate of the locking clutch; rC2The outer diameter of the friction plate of the locking clutch; μ is the lockup clutch dynamic friction factor, and has the value:
Figure FDA0003294272100000022
coefficient of static friction mu00.11; p is a pressing oil pressure value on a friction element of the lockup clutch;
Figure FDA0003294272100000031
in the formula: t is t1The time for the lockup clutch of the hydraulic torque converter to enter a slip condition; t is t2Time to achieve complete unlocking for the torque converter lockup clutch;
the electronic control unit collects the torque of the input shaft and the output shaft of the hydraulic torque converter in real time through the torque sensor, and then calculates the actual torque ratio K-T in real time1/T2，T1As input shaft torque, T2As the torque of the output shaft,
and comparing the actual torque ratio K with the unlocking target torque ratio K in real time0Until the actual torque ratio K and the unlock target torque ratio K0And if so, completing the complete unlocking of the lockup clutch of the hydraulic torque converter;
when the lockup clutch enters a complete lockup working condition from a complete unlock working condition, the method comprises the following steps:
(1) setting a lockup target slip ratio r of a torque converter1And a lockup target torque ratio K1；
(2) Control of the lockup slip ratio: closing the large oil pump, keeping the small oil pump open, and simultaneously controlling the three-position four-way reversing valve to work at a left position by the electronic control unit, so that pressure oil output by the small oil pump is input into an unlocking pressure oil outlet of the hydraulic torque converter through an opening A of the three-position four-way reversing valve and a stroke valve, return oil of an unlocking pressure oil inlet of the hydraulic torque converter enters the unlocking pressure oil outlet of the hydraulic torque converter again through an electromagnetic valve opening T and a stroke valve oil inlet, differential pressurization is realized, a compression oil pressure value on a friction element of the lockup clutch is controlled, and the lockup clutch is controlled to start to approach a shell of the hydraulic torque converter;
the electronic control unit measures the rotating speeds of the input shaft of the hydraulic torque converter and the output shaft of the hydraulic torque converter through a rotating speed sensor and calculates the actual slip ratio r in real time;
real-time comparison of actual slip ratio r with locked target slip ratio r1When the actual slip ratio r is equal to the lockup target slip ratio r of the lockup clutch of the torque converter1After the two are consistent, the locking clutch of the hydraulic torque converter is in a sliding abrasion working condition, and the next step is carried out;
(3) control of lockup torque ratio: output oil pressure of increasing and decreasing oil pumpThe electronic control unit measures the pressing oil pressure value on the friction element of the lockup clutch in real time through a pressure sensor between the lockup clutch and the shell of the hydraulic torque converter, and the electronic control unit measures the rotating speeds of the input shaft of the hydraulic torque converter and the output shaft of the hydraulic torque converter in real time through a rotating speed sensor so as to calculate the torque T transmitted by the lockup clutch in real timeT1Hemomokung W1Torque T transmitted by the lock-up clutchT1Hemomokung W1The calculation formula of (a) is as follows:
Figure FDA0003294272100000041
in the formula: omega1Is the input shaft speed; omega2Is the output shaft speed; rCIs the equivalent radius of the lockup clutch friction plate; rC1Is the inner diameter of a friction plate of the locking clutch; rC2The outer diameter of the friction plate of the locking clutch; μ is the lockup clutch dynamic friction factor, and has the value:
Figure FDA0003294272100000042
coefficient of static friction mu0＝0.11；
Figure FDA0003294272100000043
In the formula: t is t1The time for the lockup clutch of the hydraulic torque converter to enter a slip condition; t is t2Time to achieve complete lockup for a torque converter lockup clutch;
the electronic control unit collects the torque of the input shaft and the output shaft of the hydraulic torque converter in real time through the torque sensor, and then calculates the actual torque ratio K-T in real time1/T2，T1As input shaft torque, T2As the torque of the output shaft,
and comparing the actual torque ratio K with the locked target torque ratio K in real time1When the actual torque ratio K is equal to the lock-up target torque ratio K1For effecting torque converter lockup clutches in unisonAnd completely locking.
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EP0754890A2 (en) * 1995-07-17 1997-01-22 Toyota Jidosha Kabushiki Kaisha Slip control system of lockup clutch
JP2007320353A (en) * 2006-05-30 2007-12-13 Aisin Seiki Co Ltd Oil pressure supply device and driving device for vehicle
CN107489751A (en) * 2017-08-22 2017-12-19 湘潭大学 A kind of fluid torque-converter dynamic impact control device and control method
CN110159751A (en) * 2019-06-10 2019-08-23 湘潭大学 A kind of converter lockout slippage, cooling electrofluidic control device and control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754890A2 (en) * 1995-07-17 1997-01-22 Toyota Jidosha Kabushiki Kaisha Slip control system of lockup clutch
JP2007320353A (en) * 2006-05-30 2007-12-13 Aisin Seiki Co Ltd Oil pressure supply device and driving device for vehicle
CN107489751A (en) * 2017-08-22 2017-12-19 湘潭大学 A kind of fluid torque-converter dynamic impact control device and control method
CN110159751A (en) * 2019-06-10 2019-08-23 湘潭大学 A kind of converter lockout slippage, cooling electrofluidic control device and control method

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