CN111649112B - Control method of hydraulic torque converter under emergency brake working condition - Google Patents
Control method of hydraulic torque converter under emergency brake working condition Download PDFInfo
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- CN111649112B CN111649112B CN202010769926.2A CN202010769926A CN111649112B CN 111649112 B CN111649112 B CN 111649112B CN 202010769926 A CN202010769926 A CN 202010769926A CN 111649112 B CN111649112 B CN 111649112B
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- gear
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- torque converter
- hydraulic torque
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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
- F16H41/00—Rotary fluid gearing of the hydrokinetic type
-
- 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
- F16H61/38—Control of exclusively fluid gearing
- F16H61/48—Control of exclusively fluid gearing hydrodynamic
Abstract
The invention discloses a control method of a hydraulic torque converter under a sudden braking working condition, which comprises the steps that the hydraulic torque converter is in a locking state, a gear signal of a gearbox is monitored, a rotating speed signal is obtained, a rotating speed change rate is calculated, the hydraulic torque converter is forcibly opened after the rotating speed change rate reaches a certain value, the hydraulic torque converter is forcibly opened in advance by monitoring the gear and the braking degree, the hydraulic torque converter is controlled to be opened by adopting pressure compensation and time compensation, and the safety and the comfort of driving are ensured to the maximum extent on the premise that an engine is protected from being extinguished.
Description
Technical Field
The invention belongs to the technical field of hydraulic torque converter control methods, and particularly relates to a control method of a hydraulic torque converter under a sudden braking working condition.
Background
The working state of the hydraulic torque converter has two working conditions of opening and locking, the prior art mainly realizes opening and locking through the control chart of the hydraulic torque converter, and when the working state is the opening state, the torque increasing effect can be achieved, the power performance is improved, the flexible connection is adopted, the efficiency is lower due to oil liquid transmission, and the opening working condition is generally used for starting at a low gear (1 gear and 2 gears) of a vehicle or accelerating a large oil door. When the engine is in a locking state, a locking clutch inside the engine enters a locking working condition, the power of the engine can be transmitted to the transmission by 100%, the efficiency is high, but the engine belongs to hard connection at the moment and cannot play a role in increasing torque, the locking working condition is generally used for normal driving of a high gear (3 gears and above), and the using working condition and the using period are long.
In the process of implementing the invention, the inventor finds that the prior art has the following defects: under the working condition that the hydraulic torque converter is switched from locking to opening, if the pressure is reduced too fast, compared with the whole power system, the whole power system has no transition period from hard connection to soft connection, and the problem of vehicle-skipping can occur in the whole vehicle; if the engine is in a low gear, the vehicle speed is static or very low, the engine speed is reduced, even the engine is pulled to be flameout, if the pressure is reduced too slowly, the unlocking is not timely, and the potential safety hazard of engine flameout exists.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control method of a hydraulic torque converter under the condition of emergency braking, overcome the defects in the prior art and ensure the driving comfort to the maximum extent on the premise of protecting the engine from extinguishing fire.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a control method of a hydraulic torque converter under a sudden braking working condition comprises the steps that the hydraulic torque converter is in a locking state, a gear signal of a gearbox is monitored, a rotating speed signal is obtained, a rotating speed change rate is calculated, and the hydraulic torque converter is forcibly opened after the rotating speed change rate reaches a certain value.
Preferably, step 101 is included, the method starts, and then step 102 is entered;
103, acquiring a gear signal of the gearbox from TCU software, and entering step 104;
and step 108, ending.
Preferably, in step 106, the limit for forcing the torque converter to open is: when the gear of the gearbox is 1 gear and 2 gears, and the change rate of the rotating speed is lower than minus 180rpms, the hydraulic torque converter enters an open state;
when the gear of the gearbox is 3, 4 or 5, and the change rate of the rotating speed is lower than-400 rpms, the hydraulic torque converter enters an open state;
and when the gear of the gearbox is 6 gears and 7 gears, and the change rate of the rotating speed is lower than-500 rpms, the hydraulic torque converter enters an open state.
Preferably, in step 107, the torque converter control process from lockup to lockup includes time compensation and pressure compensation.
Preferably, when the gear is fixed, the smaller the speed change rate is, the larger the pressure compensation value is, and P isdropThe smaller the value; when the rotating speed change rate is the same, the lower the gear is, the larger the pressure compensation value is, and PdropThe smaller the value;
when the gear is fixed, the smaller the change rate of the rotating speed is, the larger the time compensation value is, and TP2The smaller the value; when the change rate of the rotating speed is constant, the lower the gear is, the larger the time compensation value is, and TP2The smaller the value.
Preferably, in 1 gear, when the rotating speed change rate is between-500 and-180 rpms, the pressure compensation value range is between-1.5 and-0.5 bar, PdropIn the range [ 0, 1 ] bar;
in gear 2, when the speed change rate is between-500 and-250 rpms, the pressure compensation value range is between-1.5 and-0.5 bar, PdropIn the range [ 0, 1 ] bar;
in 3 gear, when the rotation speed change rate is between-500 and-400 rpms, the pressure compensation value range is between-1 and-0.5 bar, PdropIn the range [ 0.5, 1 ] bar;
in 4-gear, when the change rate of the rotating speed is [ - ∞ -500 ] rpms, the pressure compensation value is-0.5 bar, PdropIs 1 bar.
Preferably, in 1 gear, when the rotating speed change rate is between-500 and-180 rpms, the time compensation value is between-500 and-300 ms, and TP2Is [ 0,200 ] ms;
in the 2-gear, when the change rate of the rotating speed is between-500 and-250 rpms, the time compensation value is between-500 and-100 ms, and TP2 is 0,400 ms;
in 3 gear, when the change rate of the rotating speed is between-500 and-400 rpms, the time compensation value is between-300 and-100 ms; t isP2Is [ 200,400 ] ms;
in 4-gear, when the change rate of the rotating speed is [ - ∞ -500 ] rpms, the time compensation value is-100 ms, TP2Is 400 ms.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
1. and the hydraulic torque converter is forcibly opened in advance by monitoring the gear and the braking degree.
2. The hydraulic torque converter is controlled to be opened by adopting pressure compensation and time compensation, so that the safety and the comfort of driving are ensured to the maximum extent on the premise of not extinguishing the engine.
Drawings
FIG. 1 is a flow chart of a torque converter from lockup to lockup in a hard braking condition according to the present invention; FIG. 2 is a timing diagram of the torque converter of the present invention from locked to unlocked.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following should not be construed as limiting the scope of the present invention.
In the embodiment of the method, the first step,
the larger the automobile braking force is, the stronger the deceleration feeling is, and the larger the deceleration of the automobile speed is reflected by data. Meanwhile, the speed of the vehicle can be calculated through the rotating speed of the output shaft, and the change rate of the rotating speed is the deceleration which can reflect the speed of the vehicle. In consideration of economy and drivability, different gears forcibly open the torque converter based on different braking forces.
As shown in fig. 1, a method for controlling a torque converter under a sudden braking condition,
starting at step 101, and then proceeding to step 102;
103, acquiring a gear signal of the gearbox from TCU software, and entering step 104;
and step 108, ending.
Table 1 is a torque converter state table:
in table 1, 1 indicates that the torque converter is forced to an open state, and 0 indicates that no control is performed.
When the gear of the gearbox is 1 gear and 2 gears, and the change rate of the rotating speed is lower than minus 180rpms, the hydraulic torque converter enters an open state;
when the gear of the gearbox is 3, 4 or 5, and the change rate of the rotating speed is lower than-400 rpms, the hydraulic torque converter enters an open state;
and when the gear of the gearbox is 6 gears and 7 gears, and the change rate of the rotating speed is lower than-500 rpms, the hydraulic torque converter enters an open state.
As shown in FIG. 2, when the torque converter is switched from the lockup state to the lockup state, the pressure control is divided into two stages, P1 and P2, first P1, and the pressure is decreased to a pressure decrease point P within a time period (10 ms)dropAt TP2And in time, draining to 0.
In order to take safety into account, in the case of heavy braking, the torque converter can be opened more quickly, increasing the pressure and time compensation of the basic gear and the braking force.
The solid line represents the pressure control process of the torque converter from the lockup state to the open state; the broken line represents the pressure control process of the hydraulic torque converter from locking to opening under the time compensation and the pressure compensation; normal controlled pressure drop point Pdrop1.5bar, TP2Is 500 ms.
Table 2 shows the pressure points PdropCompensation table of (2):
the values in Table 2 represent P for normal controldropPressure compensation was carried out on the basis of 1.5 bar. When the gear is 3 gears and the change rate of the rotating speed is-400 rpms, the pressure compensation value is-0.5 bar and PdropIs 1 bar.
In 1 gear, when the change rate of the rotating speed is between-500 and-180 rpms, the pressure compensation value range is between-1.5 and-0.5 bar, PdropThe range is [ 0, 1 ] bar.
In gear 2, when the speed change rate is between-500 and-250 rpms, the pressure compensation value range is between-1.5 and-0.5 bar, PdropThe range is [ 0, 1 ] bar.
In 3 gear, when the rotation speed change rate is between-500 and-400 rpms, the pressure compensation value range is between-1 and-0.5 bar, PdropThe range is [ 0.5, 1 ] bar.
In 4-gear, when the change rate of the rotating speed is [ - ∞ -500 ]At rpms, the pressure compensation value is-0.5 bar, PdropIs 1 bar.
When the gear is fixed, the smaller the change rate of the rotating speed is, the larger the pressure compensation value is, and PdropThe smaller the value; when the rotating speed change rate is the same, the lower the gear is, the larger the pressure compensation value is, and PdropThe smaller the value.
Table 3 shows the time TP2Compensation table of (2):
the values in Table 3 represent T in normal controlP2Time compensation is performed on a 500ms basis. For example, in 3-gear, the compensation value is-100 ms, T when the rotating speed change rate is-400 rpmsP2Is 400 ms.
When the gear is fixed, the smaller the change rate of the rotating speed is, the larger the time compensation value is, and TP2The smaller the value; when the change rate of the rotating speed is constant, the lower the gear is, the larger the time compensation value is, and TP2The smaller the value.
In 1 gear, when the change rate of the rotating speed is between-500 and-180 rpms, the time compensation value is between-500 and-300 ms, and TP2Is [ 0,200 ] ms;
in gear 2, when the change rate of the rotating speed is between-500 and-250 rpms, the time compensation value is between-500 and-100 ms, and TP2Is [ 0,400 ] ms;
in 3 gear, when the change rate of the rotating speed is between-500 and-400 rpms, the time compensation value is between-300 and-100 ms; t isP2Is [ 200,400 ] ms;
in 4-gear, when the change rate of the rotating speed is [ - ∞ -500 ] rpms, the time compensation value is-100 ms, TP2Is 400 ms;
when the gear is in 3 gears and the change rate of the rotating speed is-400 rpms, the pressure point PdropIs 1bar, TP2Is 400 ms.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (3)
1. A control method of a hydraulic torque converter under a sudden braking working condition is characterized by comprising the following steps: comprises that
The hydraulic torque converter is in a locked state, a gear signal of the gearbox is monitored, a rotating speed signal is obtained, the rotating speed change rate is calculated, and the hydraulic torque converter is forcibly opened after the rotating speed change rate reaches a certain value;
comprises that
Step 101, start, then enter step 102;
step 102, judging whether the hydraulic torque converter is in a locked state, if so, entering step 103, otherwise, entering step 108;
103, acquiring a gear signal of the gearbox from TCU software, and entering step 104;
step 104, acquiring a rotating speed signal from an output shaft sensor, and entering step 105;
step 105, calculating the change rate of the rotating speed according to the rotating speed signal, and entering step 106;
step 106, judging whether the change rate of the rotating speed reaches the limit value of forcibly opening the hydraulic torque converter or not by combining the gear of the gearbox, if so, entering step 107, otherwise, returning to step 103;
step 107, turning on the hydraulic torque converter, and then entering step 108;
step 108, ending;
in step 106, the limit for forcing the torque converter on is:
when the gear of the gearbox is 1 gear and 2 gears, and the change rate of the rotating speed is lower than minus 180rpms, the hydraulic torque converter enters an open state;
when the gear of the gearbox is 3, 4 or 5, and the change rate of the rotating speed is lower than-400 rpms, the hydraulic torque converter enters an open state;
when the gear of the gearbox is 6-gear and 7-gear, and the change rate of the rotating speed is lower than-500 rpms, the hydraulic torque converter enters an open state;
in step 107, the control process of the hydraulic torque converter from locking to opening comprises time compensation and pressure compensation;
when the hydraulic torque converter is switched from a locked state to an open state, the pressure control is divided into two stages, P1 and P2, firstly P1, and the pressure is reduced to a pressure reduction point P in a time perioddropAt TP2In time, draining to 0;
when the gear is fixed, the smaller the change rate of the rotating speed is, the larger the pressure compensation value is, and PdropThe smaller the value; when the rotating speed change rate is the same, the lower the gear is, the larger the pressure compensation value is, and PdropThe smaller the value;
when the gear is fixed, the smaller the change rate of the rotating speed is, the larger the time compensation value is, and TP2The smaller the value; when the change rate of the rotating speed is constant, the lower the gear is, the larger the time compensation value is, and TP2The smaller the value.
2. The method for controlling the torque converter under the condition of sudden braking as claimed in claim 1, wherein: in 1 gear, when the change rate of the rotating speed is between-500 and-180 rpms, the pressure compensation value range is between-1.5 and-0.5 bar, PdropIn the range [ 0, 1 ] bar;
in gear 2, when the speed change rate is between-500 and-250 rpms, the pressure compensation value range is between-1.5 and-0.5 bar, PdropIn the range [ 0, 1 ] bar;
in 3 gear, when the rotation speed change rate is between-500 and-400 rpms, the pressure compensation value range is between-1 and-0.5 bar, PdropIn the range [ 0.5, 1 ] bar;
in 4-gear, when the change rate of the rotating speed is [ - ∞ -500 ] rpms, the pressure compensation value is-0.5 bar, PdropIs 1 bar.
3. The method for controlling the torque converter under the condition of sudden braking as claimed in claim 1, wherein:
in 1 gear, when the change rate of the rotating speed is between-500 and-180 rpms, the time compensation value is between-500 and-300 ms, and TP2Is [ 0,200 ] ms;
in 2 gear, when the speed change rate is [ -500, -250 [ -500 [ ]At rpms, the time compensation value is [ -500, -100 ] ms, TP2Is [ 0,400 ] ms;
in 3 gear, when the change rate of the rotating speed is between-500 and-400 rpms, the time compensation value is between-300 and-100 ms; t isP2Is [ 200,400 ] ms;
in 4-gear, when the change rate of the rotating speed is [ - ∞ -500 ] rpms, the time compensation value is-100 ms, TP2Is 400 ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010769926.2A CN111649112B (en) | 2020-08-04 | 2020-08-04 | Control method of hydraulic torque converter under emergency brake working condition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010769926.2A CN111649112B (en) | 2020-08-04 | 2020-08-04 | Control method of hydraulic torque converter under emergency brake working condition |
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| CN111649112A CN111649112A (en) | 2020-09-11 |
| CN111649112B true CN111649112B (en) | 2020-12-22 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0942438A (en) * | 1995-08-03 | 1997-02-14 | Toyota Motor Corp | Speed change control device of automatic transmission |
| JP2010270772A (en) * | 2009-05-19 | 2010-12-02 | Fuji Heavy Ind Ltd | Control device of continuously variable transmission |
| CN102644730A (en) * | 2012-04-28 | 2012-08-22 | 山推工程机械股份有限公司 | Gear-shifting control method, gear-shifting control system and engineering machinery for traction work |
| CN103765052A (en) * | 2011-09-07 | 2014-04-30 | 日产自动车株式会社 | Coasting downshift control device for automatic transmission |
| CN105276165A (en) * | 2014-07-16 | 2016-01-27 | 本田技研工业株式会社 | Control apparatus for automatic transmission |
| CN109578575A (en) * | 2019-01-02 | 2019-04-05 | 盛瑞传动股份有限公司 | Automatic transmission control method |
| CN210014003U (en) * | 2019-04-26 | 2020-02-04 | 南京劲力传动技术有限公司 | Hydraulic control system and front-mounted rear-drive hydraulic automatic gearbox comprising same |
-
2020
- 2020-08-04 CN CN202010769926.2A patent/CN111649112B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0942438A (en) * | 1995-08-03 | 1997-02-14 | Toyota Motor Corp | Speed change control device of automatic transmission |
| JP2010270772A (en) * | 2009-05-19 | 2010-12-02 | Fuji Heavy Ind Ltd | Control device of continuously variable transmission |
| CN103765052A (en) * | 2011-09-07 | 2014-04-30 | 日产自动车株式会社 | Coasting downshift control device for automatic transmission |
| CN102644730A (en) * | 2012-04-28 | 2012-08-22 | 山推工程机械股份有限公司 | Gear-shifting control method, gear-shifting control system and engineering machinery for traction work |
| CN105276165A (en) * | 2014-07-16 | 2016-01-27 | 本田技研工业株式会社 | Control apparatus for automatic transmission |
| CN109578575A (en) * | 2019-01-02 | 2019-04-05 | 盛瑞传动股份有限公司 | Automatic transmission control method |
| CN210014003U (en) * | 2019-04-26 | 2020-02-04 | 南京劲力传动技术有限公司 | Hydraulic control system and front-mounted rear-drive hydraulic automatic gearbox comprising same |
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| CN111649112A (en) | 2020-09-11 |
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