CN110758097A - Control method and device for torque transmission of rear axle of four-wheel drive vehicle - Google Patents
Control method and device for torque transmission of rear axle of four-wheel drive vehicle Download PDFInfo
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- CN110758097A CN110758097A CN201810826776.7A CN201810826776A CN110758097A CN 110758097 A CN110758097 A CN 110758097A CN 201810826776 A CN201810826776 A CN 201810826776A CN 110758097 A CN110758097 A CN 110758097A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
- B60K23/08—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles
- B60K23/0808—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles for varying torque distribution between driven axles, e.g. by transfer clutch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
- B60K23/08—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles
- B60K2023/085—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles automatically actuated
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
The invention provides a method and a device for controlling the torque transmission of a rear axle of a four-wheel drive vehicle, wherein the method comprises the following steps: step S1, real-time monitoring and obtaining the current speed and the current gear of the vehicle; step S2, judging whether the current gear of the vehicle is a D gear or an R gear; and step S3, when the current gear of the vehicle is the D gear or the R gear and the current vehicle speed of the vehicle is between static and a first preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to be zero. The invention reduces vehicle shake by changing the torque transmitted by the rear axle, thereby improving the riding comfort of passengers, especially passengers in the rear row.
Description
Technical Field
The invention relates to the field of intelligent timely four-wheel drive systems, in particular to a method and a device for controlling the transmission torque of a rear axle of a four-wheel drive vehicle.
Background
Under the condition that the vehicle starts, when D shelves and R shelves braking are static, the gearbox outputs drive torque, because wheel braking vehicle does not move and engine low-speed motion unstability etc. reasons, this part drive torque is stored in driving system and is not effectively released, can cause the engine shake and then pass through the transmission shaft, the transmission of torque manager transmission is for the rear axle, thereby lead to the vehicle back row seat shake, and because the rear axle transmits engine torque and the vehicle does not rotate, lead to transmission system sliding friction serious, can lead to certain damage to transmission system.
Disclosure of Invention
The invention aims to provide a control method and a control device for torque transmission of a rear axle of a four-wheel drive vehicle, which can reduce vehicle shaking by reducing the torque transmitted by the rear axle of the vehicle when the four-wheel drive vehicle is braked and is static in a D gear and an R gear.
In order to solve the technical problem, the invention provides a control method for torque transmission of a rear axle of a four-wheel drive vehicle, which comprises the following steps:
step S1, real-time monitoring and obtaining the current speed and the current gear of the vehicle;
step S2, judging whether the current gear of the vehicle is a D gear or an R gear;
and step S3, when the current gear of the vehicle is the D gear or the R gear and the current vehicle speed of the vehicle is between static and a first preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to be zero.
The method comprises the steps that in the process that the current vehicle speed of a vehicle is gradually increased from a first preset reference vehicle speed to a second preset reference vehicle speed, the torque transmitted by a rear axle of the vehicle is controlled to be gradually increased from zero, and when the current vehicle speed of the vehicle is increased to the second preset reference vehicle speed, the torque transmitted by the rear axle of the vehicle is controlled to be increased to a normal value;
or in the process that the current vehicle speed of the vehicle is reduced from the second preset reference vehicle speed to the first preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to be gradually reduced from the normal value, and controlling the torque transmitted by the rear axle of the vehicle to be zero when the current vehicle speed of the vehicle is reduced to the first preset reference vehicle speed.
And when the current vehicle speed of the vehicle is greater than the second preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to keep the normal value, wherein the normal value is half of the total output torque of the engine.
The method comprises the steps of monitoring the rotating speed of an engine of the vehicle in real time, and determining that the vehicle is in a starting state or in a moving-to-static state according to the rotating speed of the engine and the current speed.
The first preset reference vehicle speed value is 1-2 kph, and the second preset reference vehicle speed value is 3-4 kph.
The invention also provides a control device for torque transmission of a rear axle of a four-wheel drive vehicle, which is characterized by comprising a monitoring module, a judging module and a first torque adjusting module, wherein:
the monitoring module is used for monitoring and acquiring the current speed and the current gear of the four-wheel drive vehicle in real time;
the judging module is used for judging whether the current gear of the vehicle is a D gear or an R gear;
the first torque adjusting module is used for controlling the torque transmitted by the rear axle of the vehicle to be zero when the judgment result of the judging module is that the current gear of the vehicle is a D gear or an R gear and the current speed of the vehicle is between static and a first preset reference speed.
The second torque adjusting module is used for controlling the torque transmitted by the rear axle of the vehicle to gradually increase from zero in the process that the current vehicle speed of the vehicle gradually increases from a first preset reference vehicle speed to a second preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to increase to a normal value when the current vehicle speed of the vehicle increases to the second preset reference vehicle speed; or controlling the torque transmitted by the rear axle of the vehicle to gradually decrease from the normal value in the process that the current vehicle speed of the vehicle gradually decreases from the second preset reference vehicle speed to the first preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to be zero when the current vehicle speed of the vehicle decreases to the first preset reference vehicle speed.
And the third torque adjusting module is used for controlling the torque transmitted by the rear axle of the vehicle to keep the normal value when the current vehicle speed of the vehicle is greater than the second preset reference vehicle speed, wherein the normal value is half of the total output torque of the engine.
The monitoring module is further used for monitoring the rotating speed of an engine of the vehicle, and the judging module is further used for determining that the vehicle is in a starting state or a state from moving to static according to the rotating speed of the engine and the current speed of the vehicle.
Wherein, further include: a setting module for setting the first preset reference vehicle speed value to 1-2 kph,
and the second preset reference vehicle speed value is 3-4 kph.
The embodiment of the invention has the beneficial effects that: when the vehicle is in a D gear or an R gear, the vehicle speed is monitored, when the vehicle speed is smaller than a first preset reference vehicle speed, the torque transmitted by the rear axle of the vehicle is controlled to be zero, and when the vehicle speed is larger than the first preset reference vehicle speed and smaller than a second preset reference vehicle speed, the torque transmitted by the rear axle of the vehicle is controlled to be increased to a normal torque value or reduced to be zero. The invention reduces vehicle shake by changing the torque transmitted by the rear axle, thereby improving the riding comfort of passengers, especially passengers in the rear row.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a control method for torque transmission of a rear axle of a four-wheel drive vehicle according to an embodiment of the invention.
FIG. 2 is a plot of vehicle rear axle torque transfer versus current vehicle speed for a particular implementation of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a control device for torque transmission of a rear axle of a four-wheel drive vehicle according to an embodiment of the invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, a method for controlling torque transmission of a rear axle of a four-wheel drive vehicle according to an embodiment of the present invention includes:
step S1, monitoring in real time to obtain the current speed and the current gear of the four-wheel drive vehicle;
step S2, judging whether the current gear of the vehicle is a D gear or an R gear;
and step S3, when the current gear of the vehicle is the D gear or the R gear and the current vehicle speed of the vehicle is between static and a first preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to be zero.
Wherein, the method also comprises: controlling the torque transmitted by the rear axle of the vehicle to gradually increase from zero in the process that the current vehicle speed of the vehicle gradually increases from a first preset reference vehicle speed to a second preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to increase to a normal value when the current vehicle speed of the vehicle increases to the second preset reference vehicle speed; or controlling the torque transmitted by the rear axle of the vehicle to gradually decrease from the normal value in the process of reducing the current vehicle speed of the vehicle from the second preset reference vehicle speed to the first preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to be zero when the current vehicle speed of the vehicle decreases to the first preset reference vehicle speed.
Wherein the control method further comprises: and when the current vehicle speed of the vehicle is greater than the second preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to keep the normal value, wherein the normal value is half of the total output torque of the engine.
Wherein the method further comprises: the method comprises the steps of monitoring the rotating speed of an engine of the vehicle in real time, and determining that the vehicle is in a starting state or in a moving-to-static state according to the rotating speed of the engine and the current speed of the vehicle.
Specifically, after the current vehicle speed of the vehicle is greater than a first preset reference vehicle speed, the rear axle of the vehicle is controlled to be loaded with a transmission torque, the first preset reference vehicle speed is 1-2 kph, the first preset reference vehicle speed is used for reducing the slipping of front wheels during starting, and the vehicle has good dynamic performance during starting; and when the current speed of the vehicle reaches a second preset reference speed, loading the torque value transmitted by the rear axle of the vehicle to a normal value, and ensuring that the vehicle has enough driving force to drive the vehicle, wherein the second preset reference speed value is 3-4 kph.
This is explained in detail below with reference to fig. 2. In fig. 2, a straight line 1 is an original torque loading curve, and a curve 2 is a vehicle rear axle torque loading curve of the invention. The vehicle four-wheel drive controller monitors a current vehicle speed signal, a vehicle gear signal and an engine speed signal of a vehicle, sets a first preset reference vehicle speed u0 to be 2kph, sets a second preset reference vehicle speed u1 to be 4kph, judges whether the current gear signal is a D gear or an R gear, judges whether the vehicle is in a just-started state according to the engine speed signal, and controls the torque T transmitted by a rear axle of the vehicle to be zero in the whole process that the current vehicle speed V of the vehicle is less than the first preset reference vehicle speed by 2kph if the current gearbox gear of the vehicle is the D gear or the R gear and the current vehicle is in the just-started state according to the speed of the engine. When the current speed V of the vehicle reaches 2kph, starting to load torque on the rear axle of the vehicle to ensure good dynamic property and reduce vehicle slip when the vehicle starts to run, gradually increasing the current speed of the vehicle, controlling the torque T transmitted by the rear axle of the vehicle to gradually increase, when the current speed of the vehicle reaches a second preset reference speed 4kph, increasing the torque T transmitted by the rear axle of the vehicle to a normal torque value T0 to ensure that the vehicle has enough driving force to drive the vehicle, and when the current speed of the vehicle continues to increase, keeping the torque value T transmitted by the rear axle of the vehicle to be a normal value T0, as can be seen from FIG. 2, in general conditions, the torque transmitted by the rear axle of the vehicle is a normal value T1 in the whole process that the current speed of the vehicle increases from zero. For example: when the vehicle is in a four-wheel drive mode, particularly in a four-wheel drive mode locking state, when the vehicle is at a standstill, the torque transmitted by the rear axle is half of the total output torque of the engine, while the torque transmitted by the rear axle of the vehicle is zero, and the riding comfort of passengers in the rear row can be improved by reducing the torque transmitted by the rear axle. When the vehicle is in a moving state to a static state, the control process is the same as the vehicle starting control method, specifically, when the current gear position of the vehicle is in a D gear or an R gear, when the current vehicle speed V of the vehicle is greater than a second preset reference vehicle speed 4kph, the torque T transmitted by the rear axle of the vehicle is kept at a normal torque value T0, when the current vehicle speed V of the vehicle is reduced to the second preset reference vehicle speed 4kph, the torque T transmitted by the rear axle of the vehicle is started to be controlled to be gradually reduced, and when the current vehicle speed of the vehicle is gradually reduced to the first preset reference vehicle speed, the torque T transmitted by the rear axle of the vehicle is reduced to zero. The value of torque transmitted by the rear axle of the vehicle remains zero when the current speed of the vehicle gradually decreases from the first reference speed 2kph to zero. T0= T1, although the straight line T0 and the straight line T1 do not coincide in the figure, it is only for the purpose of more clearly illustrating the comparison between the change process of the torque transmitted by the rear axle of the vehicle according to the invention and the original torque loading curve.
The embodiment of the invention has the beneficial effects that: when the vehicle is in a D gear or an R gear, the vehicle speed is monitored, when the vehicle speed is smaller than a first preset reference vehicle speed, the torque transmitted by the rear axle of the vehicle is controlled to be zero, and when the vehicle speed is larger than the first preset reference vehicle speed and smaller than a second preset reference vehicle speed, the torque transmitted by the rear axle of the vehicle is controlled to be increased to a normal torque value or reduced to be zero. The invention reduces vehicle shake by changing the torque transmitted by the rear axle, thereby improving the riding comfort of passengers, especially passengers in the rear row.
The second embodiment of the invention provides a control device for torque transmission of a rear axle of a four-wheel drive vehicle, and particularly, the control device can be realized in a four-wheel drive controller of the four-wheel drive vehicle. In one embodiment, the control apparatus includes a monitoring module 31, a determination module 32, and a first torque adjustment module 33, wherein:
the monitoring module 31 is used for monitoring the current speed and the current gear of the four-wheel drive vehicle in real time;
the judging module 32 is configured to judge whether the current gear of the vehicle is a D gear or an R gear;
the first torque adjusting module 33 is configured to control the torque transmitted by the rear axle to be zero when the determination result of the determining module is that the current gear of the vehicle is the D gear or the R gear, and the current vehicle speed of the vehicle is between standstill and a first preset reference vehicle speed.
In some embodiments, the control apparatus further comprises a second torque adjusting module 34, configured to control the torque transmitted by the rear axle of the vehicle to gradually increase from zero during the process that the current vehicle speed of the vehicle gradually increases from the first preset reference vehicle speed to the second preset reference vehicle speed, and to increase to a normal value when the current vehicle speed of the vehicle increases to the second preset reference vehicle speed; or controlling the torque transmitted by the rear axle of the vehicle to gradually decrease from the normal value in the process that the current vehicle speed of the vehicle gradually decreases from the second preset reference vehicle speed to the first preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to be zero when the current vehicle speed of the vehicle decreases to the first preset reference vehicle speed.
In some embodiments, the control apparatus further comprises a third torque adjusting module 35, configured to control the torque transmitted by the rear axle of the vehicle to maintain the normal value when the current vehicle speed of the vehicle is greater than the second preset reference vehicle speed, where the normal value is half of the total output torque of the engine.
It is understood that the first torque adjustment module 33, the second torque adjustment module 34, and the third torque adjustment module 35 may be implemented by one torque adjustment module or by a plurality of torque adjustment modules in different embodiments.
The monitoring module 31 is further configured to monitor a rotational speed of an engine of a vehicle, and the determining module 32 is further configured to determine that the vehicle is in a starting state or a moving state to a stationary state according to the rotational speed of the engine and a current speed of the vehicle.
In some embodiments, the control device further comprises a setting module for setting the first preset reference vehicle speed value to be 1-2 kph, and the second preset reference vehicle speed value to be 3-4 kph.
For the working principle and the advantageous effects thereof, please refer to the description of the first embodiment of the present invention, which will not be described herein again.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A control method for transmitting torque by a rear axle of a four-wheel drive vehicle comprises the following steps:
step S1, real-time monitoring and obtaining the current speed and the current gear of the vehicle;
step S2, judging whether the current gear of the vehicle is a D gear or an R gear;
and step S3, when the current gear of the vehicle is the D gear or the R gear and the current vehicle speed of the vehicle is between static and a first preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to be zero.
2. The control method according to claim 2, characterized in that the method further comprises:
controlling the torque transmitted by the rear axle of the vehicle to gradually increase from zero in the process that the current vehicle speed of the vehicle gradually increases from a first preset reference vehicle speed to a second preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to increase to a normal value when the current vehicle speed of the vehicle increases to the second preset reference vehicle speed;
or in the process that the current vehicle speed of the vehicle is reduced from the second preset reference vehicle speed to the first preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to be gradually reduced from the normal value, and controlling the torque transmitted by the rear axle of the vehicle to be zero when the current vehicle speed of the vehicle is reduced to the first preset reference vehicle speed.
3. The control method according to claim 2, characterized by further comprising:
and when the current vehicle speed of the vehicle is greater than the second preset reference vehicle speed, controlling the torque transmitted by the rear axle of the vehicle to keep the normal value, wherein the normal value is half of the total output torque of the engine.
4. The control method according to claim 3, characterized in that the method further comprises:
the method comprises the steps of monitoring the rotating speed of an engine of the vehicle in real time, and determining that the vehicle is in a starting state or in a moving-to-static state according to the rotating speed of the engine and the current speed.
5. The control method according to any one of claims 2 to 4, characterized in that:
the first preset reference vehicle speed value is 1-2 kph, and the second preset reference vehicle speed value is 3-4 kph.
6. The utility model provides a control device of four-wheel drive vehicle rear axle transmission moment of torsion which characterized in that, includes monitoring module, judgement module and first torque adjustment module, wherein:
the monitoring module is used for monitoring and acquiring the current speed and the current gear of the four-wheel drive vehicle in real time;
the judging module is used for judging whether the current gear of the vehicle is a D gear or an R gear;
the first torque adjusting module is used for controlling the torque transmitted by the rear axle of the vehicle to be zero when the judgment result of the judging module is that the current gear of the vehicle is a D gear or an R gear and the current speed of the vehicle is between static and a first preset reference speed.
7. The control device according to claim 6, characterized by further comprising:
the second torque adjusting module is used for controlling the torque transmitted by the rear axle of the vehicle to gradually increase from zero in the process that the current vehicle speed of the vehicle gradually increases from a first preset reference vehicle speed to a second preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to increase to a normal value when the current vehicle speed of the vehicle increases to the second preset reference vehicle speed; or controlling the torque transmitted by the rear axle of the vehicle to gradually decrease from the normal value in the process that the current vehicle speed of the vehicle gradually decreases from the second preset reference vehicle speed to the first preset reference vehicle speed, and controlling the torque transmitted by the rear axle of the vehicle to be zero when the current vehicle speed of the vehicle decreases to the first preset reference vehicle speed.
8. The control device according to claim 7, characterized by further comprising:
and the third torque adjusting module is used for controlling the torque transmitted by the rear axle of the vehicle to keep the normal value when the current vehicle speed of the vehicle is greater than the second preset reference vehicle speed, wherein the normal value is half of the total output torque of the engine.
9. The control device according to claim 8, characterized in that:
the monitoring module is further used for monitoring the rotating speed of an engine of the vehicle, and the judging module is further used for determining that the vehicle is in a starting state or a state from moving to static according to the rotating speed of the engine and the current speed of the vehicle.
10. The control device according to any one of claims 7 to 9, characterized by further comprising: a setting module for setting the first preset reference vehicle speed value to be 1-2 kph and the second preset reference
The vehicle-test speed value is 3-4 kph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810826776.7A CN110758097A (en) | 2018-07-25 | 2018-07-25 | Control method and device for torque transmission of rear axle of four-wheel drive vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810826776.7A CN110758097A (en) | 2018-07-25 | 2018-07-25 | Control method and device for torque transmission of rear axle of four-wheel drive vehicle |
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| CN110758097A true CN110758097A (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810826776.7A Pending CN110758097A (en) | 2018-07-25 | 2018-07-25 | Control method and device for torque transmission of rear axle of four-wheel drive vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362211A (en) * | 2020-10-27 | 2021-02-12 | 北京航空航天大学宁波创新研究院 | Engine predicted torque precision detection method and device and traffic equipment |
| WO2022166499A1 (en) * | 2021-02-03 | 2022-08-11 | 长城汽车股份有限公司 | Low-speed four-wheel drive mode control method and apparatus, storage medium, and electronic device |
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| US9061685B2 (en) * | 2010-02-26 | 2015-06-23 | Aisin Ai Co., Ltd. | Drive state control apparatus for vehicle |
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| JPH02227335A (en) * | 1989-02-28 | 1990-09-10 | Mitsubishi Motors Corp | Power transmission for automobile |
| US9061685B2 (en) * | 2010-02-26 | 2015-06-23 | Aisin Ai Co., Ltd. | Drive state control apparatus for vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112362211A (en) * | 2020-10-27 | 2021-02-12 | 北京航空航天大学宁波创新研究院 | Engine predicted torque precision detection method and device and traffic equipment |
| CN112362211B (en) * | 2020-10-27 | 2022-02-01 | 北京航空航天大学宁波创新研究院 | Engine predicted torque precision detection method and device and traffic equipment |
| WO2022166499A1 (en) * | 2021-02-03 | 2022-08-11 | 长城汽车股份有限公司 | Low-speed four-wheel drive mode control method and apparatus, storage medium, and electronic device |
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