CN204784548U - Bull -dozer enclosed type torque converter's unblock system that closes - Google Patents
Bull -dozer enclosed type torque converter's unblock system that closes Download PDFInfo
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- CN204784548U CN204784548U CN201520512881.5U CN201520512881U CN204784548U CN 204784548 U CN204784548 U CN 204784548U CN 201520512881 U CN201520512881 U CN 201520512881U CN 204784548 U CN204784548 U CN 204784548U
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- 238000000034 method Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
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Abstract
The utility model discloses a bull -dozer enclosed type torque converter's unblock system that closes, it triggers the submodule piece and closes unblock judgement submodule piece including closing unblock control, close unblock control and trigger the submodule piece for acquire enclosed type torque converter's control parameter, control parameter includes braking information, keeps off position information, engine temperature value, throttle aperture, secondary speed, wherein keeps off position information including information of shifting gears and neutral gear information, close the unblock and judge the submodule piece for trigger the control parameter that the submodule piece acquireed and close unblock control to enclosed type torque converter according to closing unblock control. Should close the unblock system provides multiple parameter and closes unblock control, can satisfy the bull -dozer and close the unblock requirement to various operating modes are different.
Description
Technical Field
The utility model relates to an engineering vehicle field, concretely relates to locking and unlocking system of bull-dozer locking hydraulic torque converter.
Background
The blocked torque converter is assembled in a transmission system of a vehicle to transmit power of an engine to a transmission. The use of the locked hydraulic torque converter on the bulldozer can automatically increase the torque of the vehicle during starting, improve the starting performance, reduce the impact during starting and gear shifting, prevent the engine from suddenly flameout due to overload, improve the driving comfort, obstruct the fluctuation caused by uneven torque of the engine and reduce the noise. However, hydraulic transmission is inefficient and less fuel efficient than mechanical transmission. In order to improve the transmission efficiency of the lockup type torque converter, a lockup clutch is adopted. The locking and unlocking conditions of the lock-up clutch have a great influence on the locking and unlocking quality of the entire transmission system. The traditional locking parameters are used for locking and unlocking the bulldozer, and the requirement of the bulldozer on complex working conditions cannot be met.
SUMMERY OF THE UTILITY MODEL
To the technical problem in the background art, the utility model aims to provide a bull-dozer locking hydraulic torque converter's locking release system can satisfy the control requirement of bull-dozer to various operating modes differences.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize.
A locking and unlocking system of a locking type hydraulic torque converter of a bulldozer comprises a locking and unlocking control trigger submodule and a locking and unlocking judgment submodule;
the locking and unlocking control triggering submodule is used for acquiring control parameters of the locking type hydraulic torque converter, wherein the control parameters comprise braking information, gear information, an engine water temperature value, an accelerator opening degree and a turbine rotating speed, and the gear information comprises gear shifting information and neutral gear information; and the locking and unlocking judgment submodule is used for performing locking and unlocking control on the locking type hydraulic torque converter according to the control parameters acquired by the locking and unlocking control trigger submodule.
As a further technical scheme:
the locking and unlocking judgment submodule comprises a braking judgment submodule, a gear shifting judgment submodule, a neutral gear judgment submodule, an engine water temperature value judgment submodule and a turbine rotating speed judgment submodule;
the braking judgment submodule is used for judging whether the bulldozer is in braking, and if so, controlling the locking type hydraulic torque converter to unlock;
the gear shifting judgment submodule is used for judging whether the bulldozer is in gear shifting or not, and if the bulldozer is in gear shifting, controlling the locking type hydraulic torque converter to unlock;
the neutral gear judgment submodule is used for judging whether the locked hydraulic torque converter is in a neutral gear or not when the bulldozer is not braking and is not shifting, and controlling the locked hydraulic torque converter to unlock if the locked hydraulic torque converter is in the neutral gear;
the engine water temperature value judgment submodule is used for comparing the current engine water temperature value with a minimum water temperature threshold value and a maximum water temperature threshold value when the vehicle is not braked, shifted and neutral; when the water temperature value of the current engine is smaller than the minimum water temperature threshold value, controlling the locking type hydraulic torque converter to unlock; when the water temperature value of the current engine is greater than the highest water temperature threshold value, controlling the locking type hydraulic torque converter to lock; when the water temperature value of the current engine is between the lowest water temperature threshold and the highest water temperature threshold, maintaining the current locking and unlocking state unchanged;
the turbine rotating speed judgment submodule is used for comparing the turbine rotating speed acquired during non-braking and non-gear shifting with a preset locked turbine target rotating speed when the current engine water temperature value is between the lowest water temperature threshold and the highest water temperature threshold; if the obtained turbine rotating speed is greater than the preset locked turbine target rotating speed, controlling the hydraulic torque converter to lock; if the obtained turbine rotating speed is less than the difference value between the preset locked turbine target rotating speed and the preset unlocking numerical value, controlling the locked hydraulic torque converter to unlock; and if the acquired turbine rotating speed is less than the preset locked turbine target rotating speed and greater than the difference value between the preset locked turbine target rotating speed and the preset unlocking value, maintaining the current locked and unlocked state unchanged.
The utility model has the advantages that: the locking and unlocking system controls the locking and unlocking of the bulldozer through various locking and unlocking parameters, can meet the locking and unlocking requirements of the bulldozer on various working conditions, has high control precision, and greatly improves the working efficiency and reliability of the locking type hydraulic torque converter.
Drawings
Fig. 1 is a flowchart of an embodiment of a locking and unlocking method disclosed in the present invention;
FIG. 2 is a torque-speed characteristic curve of an engine according to an embodiment of the present disclosure;
FIG. 3 is a torque-speed characteristic graph of an embodiment of the disclosed closed-end torque converter;
FIG. 4 is a graph illustrating the joint performance of an engine operating in conjunction with a closed-end torque converter according to an embodiment of the present disclosure;
fig. 5 is another flowchart of an embodiment of a locking and unlocking method disclosed in the present invention;
fig. 6 is a structural diagram of a locking and unlocking system according to another embodiment of the present invention;
fig. 7 is another structural diagram of a locking and unlocking system according to another embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
the embodiment of the utility model provides a bull-dozer locking hydraulic torque converter's locking unblock method and system, the following is explained in detail respectively.
First embodiment
In this embodiment, the lockup torque converter is a component of the bulldozer and is used for transmitting power from the engine of the bulldozer to the transmission.
A locking and unlocking method of a locking type hydraulic torque converter of a bulldozer comprises the following steps: calculating target rotating speeds of a locked turbine of a locked hydraulic torque converter under different throttle opening degrees and different working states, wherein the different working states comprise a coupling working condition, a highest efficiency working condition and a high efficiency region working condition; acquiring control parameters, wherein the control parameters comprise bulldozer brake information, gear information, accelerator opening, turbine rotating speed and engine water temperature value, and the gear information comprises gear shifting information and neutral information; and performing locking and unlocking control on the locked hydraulic torque converter according to the control parameters and the target rotating speed of the locked turbine.
Referring to fig. 1 to 5, the specific process is as follows:
100: and calculating the target rotating speed of the locked turbine of the locked hydraulic torque converter under different throttle opening degrees and different working states of the locked hydraulic torque converter, wherein the different working states comprise a coupling working condition, a highest efficiency working condition and a high efficiency region working condition.
The step 100 specifically includes:
1001: generating a torque-rotating speed characteristic curve of an engine of the bulldozer according to original performance parameters of the engine;
each engine is accompanied by original performance parameters when being shipped from a factory, and the original performance parameters of the engine comprise a rotating speed value and a torque value under a plurality of test points (usually 10 to 20 test points). As shown in fig. 2, the abscissa represents the rotational speed of the engine and the ordinate represents the torque of the engine, which are characteristic curves of the engine at different accelerator opening degrees.
1002: generating a torque-rotating speed characteristic curve of the locked hydraulic torque converter according to the original performance parameters of the engine and the original performance parameters of the locked hydraulic torque converter; the generation process is as follows:
first, a model of the lockup type torque converter may be established using the following formula (1) based on original characteristic parameters of the lockup type torque converter.
Formula (1)
Wherein: t isBRepresenting the torque, λ, of a closed-end hydrodynamic torque converterBRepresenting the torque coefficient of the closed-end hydrodynamic torque converter, i representing the speed ratio, i being the turbine speed divided by the impeller speed nBρ represents the oil density, D represents the diameter of the closed hydraulic torque converter circle, nBRepresenting the impeller speed.
One of the performance parameters is attached to each locked hydraulic torque converter when the locked hydraulic torque converter is shipped from a factory, and the original performance parameters of the locked hydraulic torque converter comprise the rotating speed of a turbine and the rotating speed n of a pump impellerBThe oil density rho, the diameter D of the closed hydraulic torque converter circle and the like; when the selected type of the locked hydraulic torque converter is determined, the oil density rho, the diameter D of a circle of the locked hydraulic torque converter and the turbine speed are determined; pump impeller speed nBThe same as the engine speed.
Two of them, λB(i) Denotes λBThe function is a function with i as a variable, the function is fitted according to data measured by tests, the rotating speed ratio i is used as an input variable, the original characteristic parameter is used as a corresponding output variable, and therefore the torque coefficient lambda corresponding to each different value of i can be calculatedB。
The torque-rotation speed characteristic curve of the lockup type torque converter is generated from the model, as shown in fig. 3. The abscissa is the rotational speed of the hydrodynamic torque converter, and the ordinate is the torque of the blocked hydrodynamic torque converter.
1003: generating a combined characteristic curve of the engine and the locked hydraulic torque converter which work together according to the torque-rotating speed characteristic curve of the engine and the torque-rotating speed characteristic curve of the locked hydraulic torque converter;
the torque-rotational speed characteristic curve of the engine and the torque-rotational speed characteristic curve of the lockup torque converter are input into the same coordinate system, and a combined characteristic curve in which the engine and the lockup torque converter work together is generated, as shown in fig. 4, the abscissa of the combined characteristic curve is the rotational speed, and the ordinate of the combined characteristic curve is the torque.
1004: acquiring a common working point of the engine and the locked hydraulic torque converter according to the combined characteristic curve;
the common operating point is an intersection point of a torque-rotation speed characteristic curve of the engine and a torque-rotation speed characteristic curve of the lockup type hydraulic torque converter in the combined characteristic curve, at the common operating point, the rotation speed of the engine is equal to the rotation speed of the lockup type hydraulic torque converter, and the torque of the engine is equal to the torque of the lockup type hydraulic torque converter.
1005: and calculating the target rotating speeds of the locked turbine and the unlocked turbine under different accelerator opening degrees and different working states according to the combined characteristic curve and the working condition characteristics of the bulldozer, so as to control the locking and unlocking of the locked hydraulic torque converter. The target rotating speed of the unlocked turbine is equal to the target rotating speed of the locked turbine minus a preset unlocking numerical value, wherein the preset unlocking numerical value can be 20r/min, 30r/min, 40r/min, 50r/min and the like.
Taking the forward gear of the bulldozer as an example, the first forward gear and the second forward gear are traction conditions (working gears), and the third forward gear is a driving condition (driving gear).
(1) The first forward gear and the second forward gear of the bulldozer are generally traction working conditions, when the traction gears work, the external load change of the bulldozer is complex, in order to improve the adaptability of a transmission system to the continuous change of the external load and increase the traction performance of the whole bulldozer, when the opening degree of an accelerator is different, a locking point is taken in a coupling working condition to ensure the traction force required by the bulldozer, so that the stability of the transmission system is improved; and determining the locking point of the hydraulic torque converter at the coupling point as the locking point of the bulldozer in the working gear.
(2) When the bulldozer drives in a forward three-gear mode and moves out of a gear mode, the driving gear is generally adopted, when the bulldozer is in the driving gear, the external load change is small, the locking point can be a low turbine rotating speed point of a working condition in an efficient area, the normal driving and the stability of the bulldozer can be guaranteed, and the fuel economy of the bulldozer is guaranteed; and determining the locking point of the hydraulic torque converter in the working condition of the high-efficiency area as the locking point of the bulldozer in the driving gear.
(3) With the bulldozer in a non-braking state, locking the torque converter may allow locking.
(4) When a driver tries to shift gears and acquires a gear shifting signal, the locked hydraulic torque converter is in an unlocked state.
200: and acquiring control parameters, wherein the control parameters comprise bulldozer brake information, gear information, accelerator opening, turbine rotating speed and engine water temperature value, and the gear information comprises gear shifting information and neutral information.
300: and performing locking and unlocking control on the locked hydraulic torque converter according to the control parameters and the target rotating speed of the locked turbine. The method specifically comprises the following steps:
firstly, performing locking and unlocking control on a locked hydraulic torque converter according to the braking information and the gear information;
secondly, performing locking and unlocking control on the locking type hydraulic torque converter according to the water temperature value of the engine;
and finally, performing locking and unlocking control on the locked hydraulic torque converter according to the turbine rotating speed, the gear information and the accelerator opening. Wherein,
and performing locking and unlocking control on the locked hydraulic torque converter according to the braking information and the gear information, which specifically comprises the following steps: determining whether the bulldozer is braking; if braking, controlling the locking type hydraulic torque converter to unlock; when the brake is not applied, judging whether the gear is shifted; if the gear is shifted, controlling the locking type hydraulic torque converter to unlock; if not, acquiring gear information, an engine water temperature value and a turbine rotating speed; and judging whether the bulldozer is in a neutral gear, and if so, controlling the locking type hydraulic torque converter to unlock.
Performing locking and unlocking control on the locked hydraulic torque converter according to the water temperature value of the engine; the method specifically comprises the following steps: when the engine water temperature value is lower than the lowest water temperature threshold value, controlling the locking type hydraulic torque converter to unlock; when the water temperature value of the engine is higher than the highest water temperature threshold value, controlling the locking type hydraulic torque converter to be locked; and when the water temperature value of the engine is between the lowest water temperature threshold and the highest water temperature threshold, namely the water temperature value of the engine is greater than or equal to the lowest water temperature threshold and is less than or equal to the highest water temperature threshold, maintaining the current locking and unlocking state unchanged.
Performing locking and unlocking control on the locked hydraulic torque converter according to the turbine speed, the gear information and the accelerator opening, specifically comprising the steps of obtaining a preset locked turbine target speed n1 according to the conditions of current gear information and the accelerator opening when the water temperature value of the engine is between a lowest water temperature threshold and a highest water temperature threshold, and specifically obtaining a preset locked turbine target speed n1 according to the locked turbine target speeds of the locked hydraulic torque converter in different working states and under different accelerator openings calculated in the step 100; obtaining a preset unlocking turbine target rotating speed n2 according to a preset locking turbine target rotating speed n1, wherein the preset unlocking turbine target rotating speed n2 is equal to n 1-a preset unlocking numerical value; wherein the preset unlocking numerical value can be 20r/min, 30r/min, 40r/min, 50r/min and the like.
Comparing the turbine speed n acquired under the non-braking and non-gear shifting condition with a preset locked turbine target speed n1 and a preset unlocked turbine target speed n 2; if n is greater than n1, controlling the locked hydraulic torque converter to be locked; if n < n2, controlling the locked hydraulic torque converter to unlock; if n2< n < n1, the current locking/unlocking state is maintained, and control ends.
As shown in fig. 5, the specific execution flow of the locking and unlocking system of the locking type hydraulic torque converter of the present invention may be as follows:
501: initializing each module after starting power-on:
502: judging initial parameters, judging whether the state parameters in each module need to be reset after initialization, if not, performing step 503, if so, performing resetting according to preset conditions, and then performing step 503, wherein the preset conditions can be set according to the requirements of practical application;
503: acquiring a locking and unlocking state, determining a current locking and unlocking mode, and if the locking and unlocking mode is an automatic mode, continuing to execute the step 504;
504: judging whether braking exists at present, and if braking exists, entering an unlocking mode; if not, go to step 505;
505: judging whether gear shifting exists at present, and if so, entering an unlocking mode; if not, go to step 506;
506: acquiring gear information, an engine water temperature value T and a turbine rotating speed n at the moment;
507: judging whether the current gear is neutral, if so, entering an unlocking mode, and if not, performing step 508;
508: judging the current water temperature value of the engine; and comparing the water temperature value T of the engine with a minimum water temperature threshold of 60 ℃ and a maximum water temperature threshold of 90 ℃, if T is less than 60 ℃, entering an unlocking mode, if T is greater than 90 ℃, entering a locking mode, and if T is greater than or equal to 60 ℃ and less than or equal to 90 ℃, maintaining the current locking and unlocking state unchanged.
509: judging the current accelerator opening state;
510: obtaining a preset locked turbine target rotating speed n1 according to the current accelerator opening and gear information; comparing the preset locked turbine target rotating speed n1 obtained in the step 509 with the turbine rotating speed n obtained in the step 506, and controlling the locked hydraulic torque converter to be locked if n is greater than n1-50 r/min; if n is less than n2, controlling the locked hydraulic torque converter to unlock; and if n is 1-50r/min < n < n1, maintaining the current locking and unlocking state unchanged, and ending the control.
Second embodiment
Referring to fig. 6 to 7, in order to better implement the above method, a second embodiment of the present invention further provides a locking and unlocking system of a closed hydraulic torque converter of a bulldozer, which includes a locking and unlocking control trigger sub-module and a locking and unlocking judgment sub-module.
And the locking and unlocking control triggering submodule is used for acquiring control parameters of the locking type hydraulic torque converter, wherein the control parameters comprise braking information, gear information, an engine water temperature value, an accelerator opening degree and a turbine rotating speed, and the gear information comprises gear shifting information and neutral gear information.
And the locking and unlocking judgment submodule is used for performing locking and unlocking control on the locking type hydraulic torque converter according to the control parameters acquired by the locking and unlocking control trigger submodule.
The locking and unlocking judgment submodule comprises a braking judgment submodule, a gear shifting judgment submodule, a neutral gear judgment submodule, an engine water temperature value judgment submodule and a turbine rotating speed judgment submodule.
The braking judgment submodule is used for judging whether the bulldozer is in braking, and if so, controlling the locking type hydraulic torque converter to unlock;
the gear shifting judgment submodule is used for judging whether the bulldozer is in gear shifting or not, and if the bulldozer is in gear shifting, controlling the locking type hydraulic torque converter to unlock;
the neutral gear judgment submodule is used for judging whether the locked hydraulic torque converter is in a neutral gear or not when the bulldozer is not braking and is not shifting, and controlling the locked hydraulic torque converter to unlock if the locked hydraulic torque converter is in the neutral gear;
the engine water temperature value judgment submodule is used for comparing the current engine water temperature value with a minimum water temperature threshold value and a maximum water temperature threshold value when the vehicle is not braked, shifted and neutral; when the water temperature value of the current engine is smaller than the minimum water temperature threshold value, controlling the locking type hydraulic torque converter to unlock; when the water temperature value of the current engine is greater than the highest water temperature threshold value, controlling the locking type hydraulic torque converter to lock; when the water temperature value of the current engine is between the lowest water temperature threshold and the highest water temperature threshold, maintaining the current locking and unlocking state unchanged;
the turbine rotating speed judgment submodule is used for comparing the turbine rotating speed acquired during non-braking and non-gear shifting with a preset locked turbine target rotating speed when the current engine water temperature value is between the lowest water temperature threshold and the highest water temperature threshold; if the obtained turbine rotating speed is greater than the preset locked turbine target rotating speed, controlling the hydraulic torque converter to lock; if the obtained turbine rotating speed is less than the difference value between the preset locked turbine target rotating speed and the preset unlocking numerical value, controlling the locked hydraulic torque converter to unlock; and if the acquired turbine rotating speed is less than the preset locked turbine target rotating speed and greater than the difference value between the preset locked turbine target rotating speed and the preset unlocking value, maintaining the current locked and unlocked state unchanged.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (2)
1. A locking and unlocking system of a locking type hydraulic torque converter of a bulldozer is characterized by comprising a locking and unlocking control trigger submodule and a locking and unlocking judgment submodule;
the locking and unlocking control triggering submodule is used for acquiring control parameters of the locking type hydraulic torque converter, wherein the control parameters comprise braking information, gear information, an engine water temperature value, an accelerator opening degree and a turbine rotating speed, and the gear information comprises gear shifting information and neutral gear information;
and the locking and unlocking judgment submodule is used for performing locking and unlocking control on the locking type hydraulic torque converter according to the control parameters acquired by the locking and unlocking control trigger submodule.
2. The locking and unlocking system of a locking type hydraulic torque converter for a bulldozer according to claim 1, characterized in that: the locking and unlocking judgment submodule comprises a braking judgment submodule, a gear shifting judgment submodule, a neutral gear judgment submodule, an engine water temperature value judgment submodule and a turbine rotating speed judgment submodule;
the braking judgment submodule is used for judging whether the bulldozer is in braking, and if so, controlling the locking type hydraulic torque converter to unlock;
the gear shifting judgment submodule is used for judging whether the bulldozer is in gear shifting or not, and if the bulldozer is in gear shifting, controlling the locking type hydraulic torque converter to unlock;
the neutral gear judgment submodule is used for judging whether the locked hydraulic torque converter is in a neutral gear or not when the bulldozer is not braking and is not shifting, and controlling the locked hydraulic torque converter to unlock if the locked hydraulic torque converter is in the neutral gear;
the engine water temperature value judgment submodule is used for comparing the current engine water temperature value with a minimum water temperature threshold value and a maximum water temperature threshold value when the vehicle is not braked, shifted and neutral; when the water temperature value of the current engine is smaller than the minimum water temperature threshold value, controlling the locking type hydraulic torque converter to unlock; when the water temperature value of the current engine is greater than the highest water temperature threshold value, controlling the locking type hydraulic torque converter to lock; when the water temperature value of the current engine is between the lowest water temperature threshold and the highest water temperature threshold, maintaining the current locking and unlocking state unchanged;
the turbine rotating speed judgment submodule is used for comparing the turbine rotating speed acquired during non-braking and non-gear shifting with a preset locked turbine target rotating speed when the current engine water temperature value is between the lowest water temperature threshold and the highest water temperature threshold; if the obtained turbine rotating speed is greater than the preset locked turbine target rotating speed, controlling the hydraulic torque converter to lock; if the obtained turbine rotating speed is less than the difference value between the preset locked turbine target rotating speed and the preset unlocking numerical value, controlling the locked hydraulic torque converter to unlock; and if the acquired turbine rotating speed is less than the preset locked turbine target rotating speed and greater than the difference value between the preset locked turbine target rotating speed and the preset unlocking value, maintaining the current locked and unlocked state unchanged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520512881.5U CN204784548U (en) | 2015-07-15 | 2015-07-15 | Bull -dozer enclosed type torque converter's unblock system that closes |
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| CN201520512881.5U CN204784548U (en) | 2015-07-15 | 2015-07-15 | Bull -dozer enclosed type torque converter's unblock system that closes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989802A (en) * | 2015-07-15 | 2015-10-21 | 长安大学 | Locking and unlocking method and locking and unlocking system for locking type hydraulic torque converter of bulldozer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989802A (en) * | 2015-07-15 | 2015-10-21 | 长安大学 | Locking and unlocking method and locking and unlocking system for locking type hydraulic torque converter of bulldozer |
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