CN113816307B - Vehicle inching control system, vehicle and vehicle inching control method - Google Patents
Vehicle inching control system, vehicle and vehicle inching control method Download PDFInfo
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- CN113816307B CN113816307B CN202111112368.3A CN202111112368A CN113816307B CN 113816307 B CN113816307 B CN 113816307B CN 202111112368 A CN202111112368 A CN 202111112368A CN 113816307 B CN113816307 B CN 113816307B
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- oil
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- torque converter
- valve
- hydraulic torque
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07572—Propulsion arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
Abstract
The invention belongs to the technical field of vehicles, and discloses a vehicle inching control system, a vehicle and a vehicle inching control method. The vehicle inching control system comprises a hydraulic torque converter, an oil tank, an oil pump, a flow control valve and an oil return valve, wherein the hydraulic torque converter is connected between an engine and a gearbox, the hydraulic torque converter is used for transmitting power output by the engine to the gearbox, the input end of the oil pump is communicated with the oil tank, the output end of the oil pump is communicated with the hydraulic torque converter through the flow control valve, the hydraulic torque converter is communicated with the oil tank through the oil return valve, and the flow control valve is used for controlling the quantity of transmission oil entering the hydraulic torque converter.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle inching control system, a vehicle and a vehicle inching control method.
Background
Some engineering vehicles need to have a jog state, for example, when a forklift is used for carrying materials, the forklift needs to accurately swing a fork below the goods when approaching the materials, and the goods cannot be knocked, or when the forklift is used for working in a narrow space, the forklift needs to move at a very slow speed, i.e. the forklift needs to have a jog state.
The existing solution is that a inching valve is added on a gearbox, when a inching pedal is stepped on, the inching valve removes part of oil flowing into a clutch in the gearbox, so that the oil pressure on the surface of a piston in the clutch is reduced, a slipping phenomenon is generated, the speed of a forklift is controlled through the slipping of the clutch, and accordingly the forklift slowly moves. However, slipping of the clutch increases wear of the clutch, which shortens the life of the clutch and even affects the dynamics of the forklift.
Disclosure of Invention
The invention aims to provide a vehicle inching control system, a vehicle and a vehicle inching control method, which are used for solving the problems that the speed of a forklift is controlled by sliding friction of a clutch, the abrasion of the clutch is increased, the service life of the clutch is shortened, and even the dynamic property of the vehicle is influenced.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides a vehicle inching control system, comprising:
a torque converter connected between an engine and a transmission, the torque converter for transmitting power output by the engine to the transmission;
the hydraulic torque converter comprises an oil tank, an oil pump, a flow control valve and an oil return valve, wherein the input end of the oil pump is communicated with the oil tank, the output end of the oil pump is communicated with the hydraulic torque converter through the flow control valve, the hydraulic torque converter is communicated with the oil tank through the oil return valve, and the flow control valve is used for controlling the quantity of transmission oil entering the hydraulic torque converter.
As a preferable mode of the inching control system for the vehicle, the inching control system for the vehicle further comprises a sequence valve and a first oil path, wherein the oil pump is communicated with the flow control valve through the sequence valve, one end of the first oil path is communicated with the oil path between the oil pump and the sequence valve, and the other end of the first oil path is communicated with the gearbox.
As a preferable scheme of the vehicle inching control system, the vehicle inching control system further comprises an overflow valve and a second oil way, wherein one end of the second oil way is connected with the oil way between the sequence valve and the flow control valve, the other end of the second oil way is connected with the oil tank, and the overflow valve is arranged in the second oil way. As a preferable mode of the above-described vehicle inching control system, further comprising a fine oil filter through which the sequence valve communicates with the oil pump.
As a preferable mode of the above-described vehicle inching control system, a coarse oil filter is further included, and the oil pump communicates with the oil tank through the coarse oil filter.
As a preferable mode of the vehicle inching control system, the vehicle inching control system further comprises a cooler, and the oil return valve is communicated with the oil tank through the cooler.
A vehicle comprises the vehicle inching control system.
The invention also provides a vehicle inching control method, which is implemented by adopting the vehicle inching control system and comprises the following steps:
when the vehicle is in a inching state, the rotating speed of the engine is unchanged, the quantity of transmission oil entering the hydraulic torque converter is controlled to be L through the flow control valve, the first set value is L1, the second set value is L2, L1 is more than 0, and L1 is less than or equal to L2.
As a preferable mode of the above-described vehicle inching control method, l=l2 when the vehicle is in a normal operating state.
As a preferable mode of the vehicle inching control method, when the engine is idling, L < L1 is not less than 0, and the vehicle is in a stationary state.
The invention has the beneficial effects that: the invention provides a vehicle inching control system, a vehicle and a vehicle inching control method, wherein after transmission oil is pumped out from an oil tank by an oil pump, the transmission oil is driven to flow back to the oil tank after sequentially passing through a flow control valve, a hydraulic torque converter and an oil return valve, the ability of the torque converter to transfer engine power to a clutch in the transmission can be varied by adjusting the amount of transmission oil entering the torque converter through a flow control valve. When the vehicle is jogged, the flow control valve is adjusted to ensure that the quantity of transmission oil entering the hydraulic torque converter is smaller, the power absorbed by the hydraulic torque converter by the engine is less, and the power converted by the hydraulic torque converter is less, so that the hydraulic torque converter outputs a smaller rotating speed to a clutch in the gearbox, and the vehicle moves at a lower speed; the transmission oil quantity entering the hydraulic torque converter is gradually increased through the flow control valve, the capacity of the hydraulic torque converter is improved, the power of the engine absorbed by the hydraulic torque converter is improved, the power converted into output power is increased, the rotating speed of a clutch in a gearbox output by the hydraulic torque converter is improved, and the vehicle speed of a vehicle is correspondingly improved. The vehicle inching control system adjusts the transmission oil quantity entering the hydraulic torque converter through the flow control valve to control the speed of the vehicle, can approach materials at a lower speed according to the requirement of a driver, can not wear a clutch, and has the advantages of small load of the hydraulic torque converter to an engine, less fuel consumption, energy conservation and environmental protection when the lower speed is kept.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle inching control system according to an embodiment of the present invention.
In the figure:
1. an oil pump; 2. a flow control valve; 3. a torque converter; 4. an oil return valve; 5. a sequence valve; 6. an overflow valve; 7. a cooler; 8. a fine oil filter; 9. a coarse oil filter.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The invention provides a vehicle inching control system, a vehicle and a vehicle inching control method, wherein the vehicle inching control system adjusts the transmission oil quantity entering a hydraulic torque converter through a flow control valve to control the speed of the vehicle, can approach materials at a lower speed according to the requirement of a driver, does not wear a clutch, and has the advantages of small load of the hydraulic torque converter on an engine, less consumed fuel and energy conservation and environmental protection when the lower speed is maintained.
As shown in fig. 1, the inching control system for a vehicle comprises a hydraulic torque converter 3, an oil tank, an oil pump 1, a flow control valve 2 and an oil return valve 4, wherein the hydraulic torque converter 3 is connected between an engine and a gearbox, the hydraulic torque converter 3 is used for transmitting power output by the engine to the gearbox, an input end of the oil pump 1 is communicated with the oil tank, an output end of the oil pump 1 is communicated with the hydraulic torque converter 3 through the flow control valve 2, the hydraulic torque converter 3 is communicated with the oil tank through the oil return valve 4, and the flow control valve 2 is used for controlling the quantity of transmission oil entering the hydraulic torque converter 3. After the oil pump 1 pumps the transmission oil from the oil tank, the transmission oil is driven to flow back to the oil tank after sequentially passing through the flow control valve 2, the hydraulic torque converter 3 and the oil return valve 4, and the transmission oil quantity entering the hydraulic torque converter 3 is regulated through the flow control valve 2, so that the capability of the hydraulic torque converter 3 for transmitting engine power to a clutch in a gearbox can be changed. The oil return valve 4 provides certain back pressure for the working of the hydraulic torque converter 3, and ensures that the hydraulic torque converter 3 can work normally. When the vehicle is jogged, the flow control valve 2 is adjusted to ensure that the quantity of transmission oil entering the hydraulic torque converter 3 is smaller, the power absorbed by the hydraulic torque converter 3 by the engine is less, and the power converted by the hydraulic torque converter 3 is smaller, so that the hydraulic torque converter 3 outputs a smaller rotating speed to a clutch in a gearbox, and the vehicle moves at a lower speed; the transmission oil quantity entering the hydraulic torque converter 3 is gradually increased through the flow control valve 2, the capacity of the hydraulic torque converter 3 is improved, the power of the engine absorbed by the hydraulic torque converter 3 is improved, the power converted into output power is increased, the rotation speed of a clutch in a gearbox output by the hydraulic torque converter 3 is increased, and the vehicle speed of a vehicle is correspondingly increased. The vehicle inching control system adjusts the transmission oil quantity entering the hydraulic torque converter 3 through the flow control valve 2 to control the speed of the vehicle, can approach materials at a lower speed according to the requirement of a driver, can not wear a clutch, and has the advantages of small load of the hydraulic torque converter 3 to an engine, less consumed fuel, energy conservation and environmental protection when the lower speed is kept.
Optionally, the hydraulic control system further comprises a sequence valve 5 and a first oil way, wherein the oil pump 1 is communicated with the flow control valve 2 through the sequence valve 5, one end of the first oil way is communicated with an oil way between the oil pump 1 and the sequence valve 5, and the other end of the first oil way is communicated with the gearbox. The transmission oil passes through two oil ways after being output from the oil pump 1, one oil way is communicated with the sequence valve 5, the transmission oil enters the hydraulic torque converter 3 after sequentially passing through the sequence valve 5 and the flow control valve 2, the other oil way is a first oil way, one end of the first oil way is communicated with an oil way between the oil pump 1 and the sequence valve 5, the other end of the first oil way is communicated with the gearbox, and the transmission oil enters the gearbox through the first oil way and is used for providing pressure for gear shifting of the gearbox. The pressure required by the working of the gearbox is high, the pressure required by the working of the hydraulic torque converter 3 is low, and the sequence valve 5 is used for ensuring that the oil pump 1 supplies oil to the gearbox before supplying oil to the hydraulic torque converter 3.
Optionally, the hydraulic system further comprises an overflow valve and a second oil way, wherein one end of the second oil way is connected with the oil way between the sequence valve and the flow control valve, the other end of the second oil way is connected with the oil tank, and the overflow valve is arranged in the second oil way. The relief valve 6 ensures that the pressure of the torque converter 3 is not higher than a safety set point, preventing damage to the torque converter 3 due to excessive pressure.
Optionally, a fine oil filter 8 is further included, and the sequence valve 5 communicates with the oil pump 1 through the fine oil filter 8. The fine oil filter 8 is used to filter the transmission oil output from the oil pump 1.
Optionally, a coarse oil filter 9 is further included, and the oil pump 1 communicates with the oil tank through the coarse oil filter 9. The coarse oil filter 9 is used for filtering transmission oil pumped from the oil tank, and the filtered transmission oil enters the oil pump 1.
Optionally, a cooler 7 is further included, and the oil return valve 4 is in communication with the oil tank through the cooler 7. The transmission oil flows into the oil tank after being cooled by the cooler 7, so that the transmission oil keeps a certain working temperature, and the damage to the sealing element of the hydraulic torque converter 3 caused by the overhigh oil temperature is avoided.
Optionally, the oil return valve 4 may also be in communication with the gearbox via a cooler 7. Transmission oil passes through the cooler into the transmission to lubricate the transmission.
The invention also provides a vehicle inching control method, which is implemented by adopting the vehicle inching control system and comprises the following steps:
the transmission oil quantity entering the torque converter 3 is controlled to be L through the flow control valve 2, wherein the first set value is L1, and the second set value is L2.
When the engine is idling, L is more than or equal to 0 and less than or equal to L1, and the vehicle is in a stationary state. When the engine is idling, the oil supply flow of the hydraulic torque converter 3 is smaller than a first set value, the flow field in the hydraulic torque converter 3 is changed, the engine and the hydraulic torque converter 3 work together to output torque and power very little, the rolling resistance of the vehicle cannot be overcome, the hydraulic torque converter 3 is in a zero-speed working condition, and the vehicle is in a static state. The transmission oil quantity entering the hydraulic torque converter 3 is gradually increased through the flow control valve 2, the internal flow field pressure of the hydraulic torque converter 3 is changed, the working output torque and power of the hydraulic torque converter 3 and the engine are increased, and when the output torque of the hydraulic torque converter 3 is enough to overcome the rolling resistance of a vehicle, the turbine of the hydraulic torque converter 3 is changed from stationary to rotary, the vehicle is slowly started, and the inching state is entered.
When the vehicle is in a inching state, the rotating speed of the engine is unchanged, the quantity of transmission oil entering the hydraulic torque converter 3 is controlled to be changed between a first set value and a second set value through the flow control valve 2, so that the moving speed of the vehicle is controlled, L1 is more than 0, and L1 is less than or equal to L2. When the vehicle is in a inching state, the flow control valve 2 is used for controlling the transmission oil quantity entering the hydraulic torque converter 3 to gradually increase, so that the working output torque and power of the engine and the hydraulic torque converter 3 are improved, and the speed of the vehicle is improved; the flow control valve 2 controls the transmission oil quantity entering the hydraulic torque converter 3 to gradually decrease, so that the working output torque and power of the engine and the hydraulic torque converter 3 are reduced, and the speed of the vehicle is reduced.
When the vehicle is in a normal operation state, the flow control valve 2 controls the amount of transmission oil entering the torque converter 3 to a second set value. L=l2. After the amount of transmission oil entering the torque converter 3 reaches the second set value, the vehicle speed is increased by increasing the rotational speed of the engine.
When the vehicle is in a normal working state, the flow control valve 2 is adjusted to a standard position, so that the quantity of transmission oil entering the hydraulic torque converter 3 is a second set value, and the output power of the hydraulic torque converter 3 meets the operation requirement of the whole machine.
The invention further provides a vehicle, which comprises the vehicle inching control system.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A vehicle jog control system, comprising:
a torque converter (3), the torque converter (3) being connected between an engine and a gearbox, the torque converter (3) being adapted to transfer power output by the engine to the gearbox;
the hydraulic torque converter comprises an oil tank, an oil pump (1), a flow control valve (2) and an oil return valve (4), wherein the input end of the oil pump (1) is communicated with the oil tank, the output end of the oil pump (1) is communicated with the hydraulic torque converter (3) through the flow control valve (2), the hydraulic torque converter (3) is communicated with the oil tank through the oil return valve (4), and the flow control valve (2) is used for controlling the quantity of transmission oil entering the hydraulic torque converter (3).
2. The inching control system of claim 1, further comprising a sequence valve (5) and a first oil passage, the oil pump (1) being in communication with the flow control valve (2) through the sequence valve (5), one end of the first oil passage being in communication with an oil passage between the oil pump (1) and the sequence valve (5), the other end being in communication with the transmission.
3. The inching control system of claim 2, further comprising an overflow valve (6) and a second oil passage, one end of the second oil passage being connected to an oil passage between the sequence valve (5) and the flow control valve (2), the other end being connected to the oil tank, the overflow valve (6) being provided in the second oil passage.
4. The vehicle inching control system according to claim 2, further comprising a fine oil filter (8), wherein the sequence valve (5) communicates with the oil pump (1) through the fine oil filter (8).
5. The inching control system of claim 1, further comprising a coarse oil filter (9), wherein the oil pump (1) communicates with the oil tank through the coarse oil filter (9).
6. The vehicle inching control system according to claim 1, further comprising a cooler (7), wherein the oil return valve (4) communicates with the oil tank through the cooler (7).
7. A vehicle comprising the vehicle jog control system of any one of claims 1-6.
8. A vehicle jog control method, implemented with the vehicle jog control system of any one of claims 1-6, comprising:
when the vehicle is in a inching state, the rotating speed of the engine is unchanged, the quantity of transmission oil entering the hydraulic torque converter (3) is controlled to be L through the flow control valve (2), the first set value is L1, the second set value is L2, L1 is more than 0, and L1 is less than or equal to L2.
9. The vehicle inching control method according to claim 8, characterized in that l=l2 when the vehicle is in a normal operation state.
10. The inching control method of claim 8, wherein 0L < L1 when the engine is idling, the vehicle being stationary.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111112368.3A CN113816307B (en) | 2021-09-23 | 2021-09-23 | Vehicle inching control system, vehicle and vehicle inching control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111112368.3A CN113816307B (en) | 2021-09-23 | 2021-09-23 | Vehicle inching control system, vehicle and vehicle inching control method |
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| CN113816307A CN113816307A (en) | 2021-12-21 |
| CN113816307B true CN113816307B (en) | 2023-07-07 |
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| JP3804358B2 (en) * | 1999-10-18 | 2006-08-02 | 株式会社豊田自動織機 | Industrial vehicle switchback control device |
| US8597159B2 (en) * | 2009-12-02 | 2013-12-03 | Ford Global Technologies, Llc | Methods and systems for assisted direct start control |
| CN104265878B (en) * | 2014-09-12 | 2016-07-06 | 绍兴金道齿轮箱有限公司 | The brake fine motion integrated control system of fork truck hydraulic transmission gearbox |
| CN112249981A (en) * | 2020-09-30 | 2021-01-22 | 安徽合力股份有限公司 | Forklift traveling system |
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2021
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| DE10360479A1 (en) * | 2002-12-27 | 2004-07-15 | Aisin AW Co., Ltd., Anjo | Fluid control device for a motor vehicle's fluid drive, operates blocking control/converter bridging in the vehicle's fluid drive |
| JP2004211802A (en) * | 2002-12-27 | 2004-07-29 | Aisin Aw Co Ltd | Hydraulic control device for lock-up mechanism |
| CN102359133A (en) * | 2011-09-27 | 2012-02-22 | 山推工程机械股份有限公司 | Hydraulic system of bulldozer |
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