CN117759706A - Automatic gearbox control method and system for plateau hill start - Google Patents
Automatic gearbox control method and system for plateau hill start Download PDFInfo
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- CN117759706A CN117759706A CN202410124707.7A CN202410124707A CN117759706A CN 117759706 A CN117759706 A CN 117759706A CN 202410124707 A CN202410124707 A CN 202410124707A CN 117759706 A CN117759706 A CN 117759706A
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Abstract
The invention discloses a control method and a system for an automatic gearbox clutch for plateau hill start, wherein the method specifically comprises the following steps: identifying whether the target vehicle meets the condition of entering a plateau hill start mode; controlling a target vehicle to enter a plateau hill start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox, and activating a hill start auxiliary system; step on the accelerator pedal, judge whether the engine speed of the target vehicle reaches the preset engine speed; if yes, the driving disc and the driven disc of the preset clutch are combined, so that the engine and the gearbox are engaged, and the hill start auxiliary system is exited. According to the invention, under the condition of not changing the engine, the target vehicle can start smoothly on the plateau ramp by adjusting the clutch control of the gearbox, and the hill-lifting capability of the target vehicle on the plateau ramp is improved.
Description
Technical Field
The invention relates to the technical field of automatic gearbox control, in particular to an automatic gearbox control method and system for plateau hill start.
Background
The air pressure is reduced in the plateau environment, the air inflow of the engine is reduced, the torque attenuation of the engine is serious due to insufficient fuel combustion, and the vehicle can be weakened or even can not start in the plateau. In addition, the transmission of the target vehicle which cannot be started is in turn prevented from rotating the engine, and the engine is likely to stall.
It is a considerable direction in the industry to effectively prevent this.
Disclosure of Invention
The invention aims to improve and innovate the defects and problems existing in the background art, and provides an automatic gearbox control method and system for plateau hill start.
According to a first aspect of the present invention, there is provided an automatic transmission clutch control method for plateau hill start, specifically comprising the steps of:
identifying whether the target vehicle meets the condition of entering a plateau hill start mode;
controlling a target vehicle to enter a plateau hill start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox, and activating a hill start auxiliary system;
step on the accelerator pedal, judge whether the engine speed of the target vehicle reaches the preset engine speed;
if yes, the driving disc and the driven disc of the preset clutch are combined, so that the engine and the gearbox are engaged, and the hill start auxiliary system is exited.
Further, the step of identifying whether the target vehicle meets the condition of entering the altitude hill start mode specifically includes:
judging whether the atmospheric pressure monitored by the target vehicle is smaller than a preset pressure threshold value or not;
judging whether the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value or not;
judging whether the accelerator opening of the target vehicle is larger than a preset opening threshold value or not;
judging whether the accelerator opening time of the target vehicle is greater than a preset time threshold value or not;
judging whether the engine speed of the target vehicle is smaller than a preset speed threshold value or not;
judging whether the engine speed change rate of the target vehicle is smaller than a preset speed change rate threshold value or not;
judging whether the gear of the target vehicle is in the D gear;
if the conditions are satisfied, the target vehicle satisfies the condition of entering the altitude slope starting mode.
In a further scheme, the step of separating the driving disc and the driven disc of the preset clutch specifically comprises the following steps:
for a double-clutch automatic gearbox, a driving disc and a driven disc of a clutch for controlling odd gears are separated;
for an automatic transmission that requires multiple clutch combinations for a first gear, a corresponding one of the clutches is disengaged to disconnect engine power from the transmission.
Further, the step of determining whether the engine speed of the target vehicle reaches the preset engine speed specifically includes:
monitoring the gradient of a ramp where a target vehicle is located;
when the gradient of the ramp is monitored to be smaller than a preset gradient threshold value, judging whether the engine speed of the target vehicle reaches a first preset engine speed or not;
and when the gradient of the ramp is monitored to be larger than a preset gradient threshold value, judging whether the engine speed of the target vehicle reaches a second preset engine speed or not, wherein the second preset engine speed is larger than the first preset engine speed.
The further scheme is that the gradient of the ramp is the ramp gradient obtained at the stopping time of the previous driving period, and the method for obtaining the ramp gradient is as follows:
acquiring the longitudinal acceleration a of the vehicle through a vehicle body stabilizing system;
obtaining actual acceleration a of vehicle by wheel speed sensor x ；
And obtaining the slope gradient theta DEG of the driving road section according to the vehicle longitudinal acceleration and the vehicle actual acceleration, wherein the slope gradient theta DEG is equal to the vehicle longitudinal acceleration a and the vehicle actual acceleration a x The relation of (a) is (a-a) x ) 180/pi=sin (θ°) 9.8; wherein a is x ＝(V 2 -V 1 )/Δt，V 2 For the linear speed of the wheel detected by the wheel speed sensor at the second moment, V 1 The wheel linear speed monitored for the first time wheel speed sensor.
According to a second aspect of the present invention, there is provided an automatic transmission clutch control system for plateau hill start, comprising in particular:
the identifying module is used for identifying whether the target vehicle meets the condition of entering the altitude slope starting mode or not;
the separation module is used for controlling the target vehicle to enter a high-altitude hill-start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox and activate a hill-start auxiliary system;
the judging module is used for judging whether the engine speed of the target vehicle reaches the preset engine speed after the accelerator pedal is stepped on;
and the combining module is used for combining the driving disc and the driven disc of the preset clutch when the engine speed of the target vehicle reaches the preset engine speed so as to enable the engine to be engaged with the gearbox and exit the hill start auxiliary system.
Further, the judging module is specifically configured to:
judging whether the atmospheric pressure monitored by the target vehicle is smaller than a preset pressure threshold value or not;
judging whether the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value or not;
judging whether the accelerator opening of the target vehicle is larger than a preset opening threshold value or not;
judging whether the accelerator opening time of the target vehicle is greater than a preset time threshold value or not;
judging whether the engine speed of the target vehicle is smaller than a preset speed threshold value or not;
judging whether the engine speed change rate of the target vehicle is smaller than a preset speed change rate threshold value or not;
judging whether the gear of the target vehicle is in the D gear;
if the conditions are satisfied, the target vehicle satisfies the condition of entering the altitude slope starting mode.
Further, the separation module is specifically configured to:
for a double-clutch automatic gearbox, a driving disc and a driven disc of a clutch for controlling odd gears are separated;
for an automatic transmission that requires multiple clutch combinations for a first gear, a corresponding one of the clutches is disengaged to disconnect engine power from the transmission.
Further, the judging module specifically includes:
the monitoring unit is used for monitoring the gradient of the ramp where the target vehicle is located;
the first judging unit is used for judging whether the engine speed of the target vehicle reaches a first preset engine speed or not when the gradient of the ramp is monitored to be smaller than a preset gradient threshold value;
and the second judging unit is used for judging whether the engine speed of the target vehicle reaches a second preset engine speed or not when the gradient of the ramp is monitored to be larger than a preset gradient threshold value, wherein the second preset engine speed is larger than the first preset engine speed.
Further, the monitoring unit is specifically configured to:
acquiring the longitudinal acceleration a of the vehicle through a vehicle body stabilizing system;
obtaining actual acceleration a of vehicle by wheel speed sensor x ；
And obtaining the slope gradient theta DEG of the driving road section according to the vehicle longitudinal acceleration and the vehicle actual acceleration, wherein the slope gradient theta DEG is equal to the vehicle longitudinal acceleration a and the vehicle actual acceleration a x The relation of (a) is (a-a) x ) 180/pi=sin (θ°) 9.8; wherein a is x ＝(V 2 -V 1 )/Δt，V 2 For the linear speed of the wheel detected by the wheel speed sensor at the second moment, V 1 The method comprises the steps of monitoring the linear speed of a wheel for a first moment wheel speed sensor;
the gradient of the ramp where the target vehicle is located is the gradient of the ramp obtained at the parking time of the previous driving period.
Compared with the prior art, the invention has the beneficial effects that: the invention provides an automatic gearbox clutch control method for plateau hill start, which is characterized in that after a target vehicle is identified to meet the condition of entering a plateau hill start mode, the target vehicle is controlled to enter the plateau hill start mode, and a driving disc and a driven disc of a preset clutch are separated so as to separate an engine from a gearbox, so that the gearbox is prevented from dragging the engine, and the rotation speed and the output torque of the engine are not influenced; when the accelerator pedal is stepped on, after the engine speed of the target vehicle is monitored to be increased to the preset engine speed, a driving disc and a driven disc of a preset clutch are combined, so that the engine and the gearbox are connected; at the moment, the power of the engine can be transmitted to the gearbox, and the rotating speed of the engine is high enough at the moment, so that the target vehicle can start smoothly on the slope of the plateau, and the slope lifting capacity of the target vehicle on the slope of the plateau is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling an automatic transmission clutch for hill start on a plateau according to a first embodiment of the present invention;
fig. 2 is a block diagram of an automatic transmission clutch control system for hill start on a plateau according to a second embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present invention provides a control method of an automatic gearbox clutch for plateau hill start, which specifically includes the following steps:
step S1, identifying whether a target vehicle meets the condition of entering a plateau hill start mode;
in addition, under the condition of the plateau environment, the air pressure is reduced, the air inflow of the engine is reduced, the torque attenuation of the engine is serious due to insufficient fuel combustion, the starting capability of the target vehicle on the plateau is weakened or even the target vehicle cannot be started, the rotating speed of the engine is inhibited in turn by the gearbox of the target vehicle which cannot be started, and the engine is flameout; therefore, it is necessary to enhance the starting ability on a plateau ramp.
The target vehicle runs in the plateau environment and is not necessarily in the hill start stage; in the hill start stage, the conventional start strategy is not necessarily capable of smoothly starting; therefore, before the control target vehicle enters the altitude slope mode, it is necessary to identify whether the target vehicle satisfies the condition of entering the altitude slope mode.
Specifically, the conditions for entering the plateau hill start mode include: (1) Whether the atmospheric pressure monitored by the target vehicle is smaller than a preset pressure threshold value; (2) Whether the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value or not; (3) Whether the accelerator opening of the target vehicle is larger than a preset opening threshold; (4) Whether the accelerator opening time of the target vehicle is greater than a preset time threshold; (5) Whether the engine speed of the target vehicle is less than a preset speed threshold; (6) Whether the engine speed change rate of the target vehicle is smaller than a preset speed change rate threshold; (6) the target vehicle gear is in D gear. It will be appreciated that monitoring the barometric pressure may determine whether the target vehicle is in a plateau environment; monitoring the driving wheel speed of the target vehicle can judge whether the target vehicle is in a starting stage or not; the accelerator opening, the accelerator opening time, the engine speed and the engine speed change rate of the target vehicle are monitored, and whether the target vehicle can start smoothly in a conventional mode can be judged; therefore, whether the target vehicle can start smoothly in the conventional mode or not can be judged in the starting stage of the target vehicle in the plateau environment, and whether the target vehicle enters the plateau slope starting mode or not is determined; obviously, when the above conditions of the target vehicle are satisfied, it indicates that the target vehicle cannot start smoothly in the starting stage under the plateau environment, and step S2 is executed at this time, that is, the target vehicle is controlled to enter the plateau hill start mode.
Illustratively, if the target vehicle monitors that the atmospheric pressure is less than 50kpa through the atmospheric pressure sensor, then it indicates that the atmospheric pressure monitored by the target vehicle is less than a preset pressure threshold; the method comprises the steps that when a target vehicle monitors that the driving wheel speed is smaller than 15kph through a wheel speed sensor of an ABS system, the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value; the target vehicle monitors that the accelerator opening is larger than 80% through a control signal of an electronic accelerator pedal, and indicates that the accelerator opening of the target vehicle is larger than a preset opening threshold; the target vehicle monitors that the accelerator opening time is more than 3s through a control signal of an electronic accelerator pedal, and indicates that the accelerator opening time of the target vehicle is more than a preset time threshold; the target vehicle monitors that the engine speed is less than 2000rpm and the engine speed change rate is less than 50rpm/s through the crankshaft position sensor, and then the engine speed of the target vehicle is less than a preset speed threshold value and the engine speed change rate of the target vehicle is less than a preset speed change rate threshold value.
S2, controlling the target vehicle to enter a plateau hill start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox, and activating a hill start auxiliary system;
as described above, when it is recognized that the target vehicle satisfies the condition of entering the altitude hill start mode, the target vehicle is controlled to enter the altitude hill start mode, and the driving disc and the driven disc of the preset clutch are separated; specifically, for the dual clutch automatic gearbox, only two clutches are provided, 1 odd gear is controlled, 1 even gear is controlled, and only 1 clutch is needed for gear combination, so that after a control target vehicle enters a plateau hill-climbing mode, a driving disc and a driven disc of the clutch (1 gear control clutch) for controlling the odd gear are separated at the moment; for an 8AT automatic gearbox and a 9AT automatic gearbox, 3 clutch combinations are generally needed for one gear, for example, an 8AT gearbox is provided with 5 clutches inside, 4 groups of planetary rows, the power transmission of the planetary rows is controlled by controlling the combination of the clutches, for example, a first gear is formed, 3 clutch combinations are needed, and an A clutch controls the P1 sun gear to be fixed; the clutch B controls the fixation of the gear ring of the P1, so as to control the fixation of the planet carrier of the P1, the planet carrier of the P1 is connected with the gear ring of the P4, and the gear ring corresponding to the P4 is fixed; the power of the control input shaft of the clutch C is combined with the P4 sun gear, so that the power is transmitted to the P4 planet carrier by the P4 sun gear, and the P4 planet carrier is connected with the output shaft of the gearbox; thus, after the control target vehicle enters the plateau hill mode, the driving and driven discs of the C clutch are disengaged at this time, while the driving and driven discs of the a and B clutches remain engaged. It can be understood that the driving disc and the driven disc of the clutch which are used for controlling the combination of the power of the input shaft and the sun wheel are in a separated state, so that the power of the engine cannot be transmitted to the gearbox, and if the accelerator pedal is stepped on at the moment, the gearbox cannot generate a dragging effect on the engine, so that the rotating speed and the output torque of the engine can be improved, and the engine cannot be flameout.
It should be noted that, at this time, since the target vehicle has not yet started, in order to prevent the vehicle from running backward, it is necessary to activate the hill start assist system HHC; the hill start assist system HHC is a prior art, and will not be described in detail herein.
It should be further noted that, the control of the target vehicle to enter the altitude hill start mode is triggered under the condition of failure in starting in the normal mode, and the control of the target vehicle to enter the Gao Yuanpo start mode is only to separate the driving disc and the driven disc of the preset clutch, and the gear of the target vehicle is not adjusted; therefore, the gear of the target vehicle is still the D range at this time.
Step S3, stepping on an accelerator pedal, and judging whether the engine speed of the target vehicle reaches a preset engine speed;
as previously described, when the engine and gearbox are combined, the gearbox of the target vehicle that cannot be started will in turn inhibit the rotational speed of the engine, resulting in engine stall; therefore, the driving disc and the driven disc of the preset clutch are separated, so that the engine and the gearbox are separated; at this time, when the accelerator pedal is depressed, the transmission does not adversely inhibit the engine speed in the process of increasing the engine speed and torque of the target vehicle.
It should be noted that, for the slopes with different slopes, the engine speeds corresponding to the starting of the target vehicle have differences, the larger the slope of the slope is, the larger engine torque is required for the starting of the target vehicle, and the higher the engine speed is required before the preset clutch is combined; for a small-gradient ramp, the engine output torque is not required to be higher to enable the target vehicle to start smoothly, and when the engine and the gearbox are combined together through the clutch under the condition that the engine output torque is smaller, the damage to the clutch is small, and the service life of the clutch is longer. Therefore, when the gradient of the ramp is monitored to be smaller than the preset gradient threshold value, judging whether the engine speed of the target vehicle reaches the first preset engine speed, if so, executing the step S4; and when the gradient of the ramp is monitored to be larger than the preset gradient threshold value, judging whether the engine speed of the target vehicle reaches a second preset engine speed, if so, executing the step S4, wherein the second preset engine speed is larger than the first preset engine speed, and the second preset engine speed is not larger than 2000N.
It should be noted that the vehicle longitudinal acceleration a may be obtained by the vehicle body stabilization system, and the vehicle actual acceleration a may be obtained by the wheel speed sensor x And obtaining the slope gradient theta DEG of the driving road section according to the vehicle longitudinal acceleration and the vehicle actual acceleration, wherein the slope gradient theta DEG is equal to the vehicle longitudinal acceleration a and the vehicle actual acceleration a x The relation of (a) is (a-a) x ) 180/pi=sin (θ°) 9.8; wherein a is x ＝(V 2 -V 1 )/Δt，V 2 For the linear speed of the wheel detected by the wheel speed sensor at the second moment, V 1 For the wheel linear speed monitored by the wheel speed sensor at the first time, Δt is the time interval, and Δt is 0.05s in the present embodiment. It can be understood that, when the target vehicle is running, the gradient of the ramp where the target vehicle is located is updated and stored continuously, and when the target vehicle is parked on the ramp, the gradient of the ramp where the parking time is located is acquired correspondingly; thus, when the target vehicle is on a hill start, the hill gradient corresponding to the stop time may be invoked to be compared with the preset gradient threshold value.
S4, combining a driving disc and a driven disc of a preset clutch so as to enable an engine to be engaged with a gearbox and exit from the hill start auxiliary system;
specifically, when the engine speed of the target vehicle is monitored to reach the preset engine speed, the driving disc and the driven disc of the preset clutch are driven to be combined together, so that the engine and the gearbox are combined, and the power of the engine can be transmitted to the gearbox.
In summary, the invention provides an automatic gearbox clutch control method for plateau hill start, when a target vehicle is identified to meet the condition of entering a plateau hill start mode, the target vehicle is controlled to enter the plateau hill start mode, and a driving disc and a driven disc of a preset clutch are separated so as to separate an engine from a gearbox, so that the gearbox is prevented from dragging the engine, and the rotation speed and the output torque of the engine are not influenced; when the accelerator pedal is stepped on, after the engine speed of the target vehicle is monitored to be increased to the preset engine speed, a driving disc and a driven disc of a preset clutch are combined, so that the engine and the gearbox are connected; at the moment, the power of the engine can be transmitted to the gearbox, and the rotating speed of the engine is high enough at the moment, so that the target vehicle can start smoothly on the slope of the plateau, and the slope lifting capacity of the target vehicle on the slope of the plateau is improved.
Example 2
Referring to fig. 2, the present invention provides an automatic gearbox clutch control system for plateau hill start, specifically comprising:
the identifying module is used for identifying whether the target vehicle meets the condition of entering the altitude slope starting mode or not;
the separation module is used for controlling the target vehicle to enter a high-altitude hill-start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox and activate a hill-start auxiliary system;
the judging module is used for judging whether the engine speed of the target vehicle reaches the preset engine speed after the accelerator pedal is stepped on;
and the combining module is used for combining the driving disc and the driven disc of the preset clutch when the engine speed of the target vehicle reaches the preset engine speed so as to enable the engine to be engaged with the gearbox and exit the hill start auxiliary system.
Optionally, the judging module is specifically configured to:
judging whether the atmospheric pressure monitored by the target vehicle is smaller than a preset pressure threshold value or not;
judging whether the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value or not;
judging whether the accelerator opening of the target vehicle is larger than a preset opening threshold value or not;
judging whether the accelerator opening time of the target vehicle is greater than a preset time threshold value or not;
judging whether the engine speed of the target vehicle is smaller than a preset speed threshold value or not;
judging whether the engine speed change rate of the target vehicle is smaller than a preset speed change rate threshold value or not;
judging whether the gear of the target vehicle is in the D gear;
if the conditions are satisfied, the target vehicle satisfies the condition of entering the altitude slope starting mode.
Optionally, the separation module is specifically configured to:
for a double-clutch automatic gearbox, a driving disc and a driven disc of a clutch for controlling odd gears are separated;
for an automatic transmission that requires multiple clutch combinations for a first gear, a corresponding one of the clutches is disengaged to disconnect engine power from the transmission.
Optionally, the judging module specifically includes:
the monitoring unit is used for monitoring the gradient of the ramp where the target vehicle is located;
the first judging unit is used for judging whether the engine speed of the target vehicle reaches a first preset engine speed or not when the gradient of the ramp is monitored to be smaller than a preset gradient threshold value;
and the second judging unit is used for judging whether the engine speed of the target vehicle reaches a second preset engine speed or not when the gradient of the ramp is monitored to be larger than a preset gradient threshold value, wherein the second preset engine speed is larger than the first preset engine speed.
Optionally, the monitoring unit is specifically configured to:
acquiring the longitudinal acceleration a of the vehicle through a vehicle body stabilizing system;
obtaining actual acceleration a of vehicle by wheel speed sensor x ；
And obtaining the slope gradient theta DEG of the driving road section according to the vehicle longitudinal acceleration and the vehicle actual acceleration, wherein the slope gradient theta DEG is equal to the vehicle longitudinal acceleration a and the vehicle actual acceleration a x The relation of (a) is (a-a) x ) 180/pi=sin (θ°) 9.8; wherein a is x ＝(V 2 -V 1 )/Δt，V 2 For the linear speed of the wheel detected by the wheel speed sensor at the second moment, V 1 The method comprises the steps of monitoring the linear speed of a wheel for a first moment wheel speed sensor;
the gradient of the ramp where the target vehicle is located is the gradient of the ramp obtained at the parking time of the previous driving period.
It should be noted that the functions or operation steps implemented when the above modules are executed are substantially the same as those in the above method embodiments, and are not described herein again.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application for the embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The clutch control method for the automatic gearbox for the plateau hill start is characterized by comprising the following steps of:
identifying whether the target vehicle meets the condition of entering a plateau hill start mode;
controlling a target vehicle to enter a plateau hill start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox, and activating a hill start auxiliary system;
step on the accelerator pedal, judge whether the engine speed of the target vehicle reaches the preset engine speed;
if yes, the driving disc and the driven disc of the preset clutch are combined, so that the engine and the gearbox are engaged, and the hill start auxiliary system is exited.
2. The automatic transmission clutch control method for plateau hill start according to claim 1, wherein the step of identifying whether the target vehicle satisfies the condition of entering the plateau hill start mode specifically includes:
judging whether the atmospheric pressure monitored by the target vehicle is smaller than a preset pressure threshold value or not;
judging whether the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value or not;
judging whether the accelerator opening of the target vehicle is larger than a preset opening threshold value or not;
judging whether the accelerator opening time of the target vehicle is greater than a preset time threshold value or not;
judging whether the engine speed of the target vehicle is smaller than a preset speed threshold value or not;
judging whether the engine speed change rate of the target vehicle is smaller than a preset speed change rate threshold value or not;
judging whether the gear of the target vehicle is in the D gear;
if the conditions are satisfied, the target vehicle satisfies the condition of entering the altitude slope starting mode.
3. The method for controlling an automatic transmission clutch for a plateau hill start according to claim 1, wherein the step of separating the driving disc and the driven disc of the preset clutch specifically comprises:
for a double-clutch automatic gearbox, a driving disc and a driven disc of a clutch for controlling odd gears are separated;
for an automatic transmission that requires multiple clutch combinations for a first gear, a corresponding one of the clutches is disengaged to disconnect engine power from the transmission.
4. The automatic transmission clutch control method for plateau hill start according to claim 1, wherein the step of determining whether the engine speed of the target vehicle reaches the preset engine speed specifically includes:
monitoring the gradient of a ramp where a target vehicle is located;
when the gradient of the ramp is monitored to be smaller than a preset gradient threshold value, judging whether the engine speed of the target vehicle reaches a first preset engine speed or not;
and when the gradient of the ramp is monitored to be larger than a preset gradient threshold value, judging whether the engine speed of the target vehicle reaches a second preset engine speed or not, wherein the second preset engine speed is larger than the first preset engine speed.
5. The automatic transmission control method for plateau hill start according to claim 4, wherein:
the gradient of the ramp is the ramp gradient obtained at the stopping time of the previous driving period, and the method for obtaining the ramp gradient is as follows:
acquiring the longitudinal acceleration a of the vehicle through a vehicle body stabilizing system;
obtaining actual acceleration a of vehicle by wheel speed sensor x ；
And obtaining the slope gradient theta DEG of the driving road section according to the vehicle longitudinal acceleration and the vehicle actual acceleration, wherein the slope gradient theta DEG is equal to the vehicle longitudinal acceleration a and the vehicle actual acceleration a x The relation of (a) is (a-a) x ) 180/pi=sin (θ°) 9.8; wherein a is x ＝(V 2 -V 1 )/Δt，V 2 For the linear speed of the wheel detected by the wheel speed sensor at the second moment, V 1 The wheel linear speed monitored for the first time wheel speed sensor.
6. An automatic gearbox clutch control system for plateau hill start specifically comprises:
the identifying module is used for identifying whether the target vehicle meets the condition of entering the altitude slope starting mode or not;
the separation module is used for controlling the target vehicle to enter a high-altitude hill-start mode, separating a driving disc and a driven disc of a preset clutch so as to separate an engine from a gearbox and activate a hill-start auxiliary system;
the judging module is used for judging whether the engine speed of the target vehicle reaches the preset engine speed after the accelerator pedal is stepped on;
and the combining module is used for combining the driving disc and the driven disc of the preset clutch when the engine speed of the target vehicle reaches the preset engine speed so as to enable the engine to be engaged with the gearbox and exit the hill start auxiliary system.
7. The automatic transmission clutch control system for plateau hill start of claim 6, wherein said determination module is specifically configured to:
judging whether the atmospheric pressure monitored by the target vehicle is smaller than a preset pressure threshold value or not;
judging whether the driving wheel speed of the target vehicle is smaller than a preset wheel speed threshold value or not;
judging whether the accelerator opening of the target vehicle is larger than a preset opening threshold value or not;
judging whether the accelerator opening time of the target vehicle is greater than a preset time threshold value or not;
judging whether the engine speed of the target vehicle is smaller than a preset speed threshold value or not;
judging whether the engine speed change rate of the target vehicle is smaller than a preset speed change rate threshold value or not;
judging whether the gear of the target vehicle is in the D gear;
if the conditions are satisfied, the target vehicle satisfies the condition of entering the altitude slope starting mode.
8. An automatic transmission clutch control system for a plateau hill start as claimed in claim 6, wherein said disengagement module is specifically configured to:
for a double-clutch automatic gearbox, a driving disc and a driven disc of a clutch for controlling odd gears are separated;
for an automatic transmission that requires multiple clutch combinations for a first gear, a corresponding one of the clutches is disengaged to disconnect engine power from the transmission.
9. The automatic transmission clutch control system for plateau hill start of claim 6, wherein said determination module specifically comprises:
the monitoring unit is used for monitoring the gradient of the ramp where the target vehicle is located;
the first judging unit is used for judging whether the engine speed of the target vehicle reaches a first preset engine speed or not when the gradient of the ramp is monitored to be smaller than a preset gradient threshold value;
and the second judging unit is used for judging whether the engine speed of the target vehicle reaches a second preset engine speed or not when the gradient of the ramp is monitored to be larger than a preset gradient threshold value, wherein the second preset engine speed is larger than the first preset engine speed.
10. An automatic gearbox control system for a highland hill start according to claim 9, characterized in that the monitoring unit is specifically adapted to:
acquiring the longitudinal acceleration a of the vehicle through a vehicle body stabilizing system;
obtaining actual acceleration a of vehicle by wheel speed sensor x ；
And obtaining the slope gradient theta DEG of the driving road section according to the vehicle longitudinal acceleration and the vehicle actual acceleration, wherein the slope gradient theta DEG is equal to the vehicle longitudinal acceleration a and the vehicle actual acceleration a x The relation of (a) is (a-a) x ) 180/pi=sin (θ°) 9.8; wherein a is x ＝(V 2 -V 1 )/Δt，V 2 For the linear speed of the wheel detected by the wheel speed sensor at the second moment, V 1 The method comprises the steps of monitoring the linear speed of a wheel for a first moment wheel speed sensor;
the gradient of the ramp where the target vehicle is located is the gradient of the ramp obtained at the parking time of the previous driving period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410124707.7A CN117759706A (en) | 2024-01-30 | 2024-01-30 | Automatic gearbox control method and system for plateau hill start |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410124707.7A CN117759706A (en) | 2024-01-30 | 2024-01-30 | Automatic gearbox control method and system for plateau hill start |
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| Publication Number | Publication Date |
|---|---|
| CN117759706A true CN117759706A (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410124707.7A Pending CN117759706A (en) | 2024-01-30 | 2024-01-30 | Automatic gearbox control method and system for plateau hill start |
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| Country | Link |
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| CN (1) | CN117759706A (en) |
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- 2024-01-30 CN CN202410124707.7A patent/CN117759706A/en active Pending
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