CN110293971B - Ramp slow descending control method, ramp slow descending control system and vehicle - Google Patents
Ramp slow descending control method, ramp slow descending control system and vehicle Download PDFInfo
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- CN110293971B CN110293971B CN201910551655.0A CN201910551655A CN110293971B CN 110293971 B CN110293971 B CN 110293971B CN 201910551655 A CN201910551655 A CN 201910551655A CN 110293971 B CN110293971 B CN 110293971B
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- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W2050/146—Display means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/10—Accelerator pedal position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/12—Brake pedal position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/15—Road slope, i.e. the inclination of a road segment in the longitudinal direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2720/00—Output or target parameters relating to overall vehicle dynamics
- B60W2720/10—Longitudinal speed
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Human Computer Interaction (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
- Controls For Constant Speed Travelling (AREA)
Abstract
A ramp slow descending control method, a ramp slow descending control system and a vehicle are provided, the method comprises the following steps: judging whether the cross-country mode is started or not; when the off-road mode is started, judging whether the current speed of the vehicle is in a preset speed interval or not and whether the gradient of a slope where the vehicle is located is in a preset gradient interval or not; and if the current speed of the vehicle is in the preset speed interval and the slope of the slope where the vehicle is located is in the preset slope interval, activating the ramp slow-down control function, and controlling the vehicle to keep the current speed when the ramp slow-down control function is activated to run. The ramp descent control method is simple to operate, can accurately reflect the driving intention of a driver, and has good driving experience.
Description
Technical Field
The invention relates to the field of automatic control of vehicles, in particular to a ramp descent control method, a ramp descent control system and a vehicle.
Background
Normally, when the vehicle is descending a slope and the accelerator pedal is released, the engine will run at a lower speed and the vehicle will slow down (normal engine braking effect). However, if the downhill grade becomes steeper, or when the vehicle is heavily loaded, the speed of the vehicle may increase despite the effect of engine braking. In this case, the brake must be stepped to reduce the vehicle speed, and if the driver does not operate properly, the vehicle is easily controlled and causes a safety accident.
The vehicle runs on a steep slope or a rough road section, and a ramp Descent Control (HDC) function can use brake intervention to ensure the descending speed of the vehicle and the running stability of the vehicle, so that the transition stress of a driver is relieved, and the safe running of the vehicle is ensured.
The ramp down control function is a sub-function of an electronic stability control system (ESC) for controlling the speed and stability of the vehicle when the vehicle is descending at low speed. The ramp descent control function uses braking intervention and self gravity component to maintain a safe descent speed under the condition that a driver steps on a brake pedal and an accelerator pedal to stabilize the vehicle speed under a steep descent condition. This function is increasingly applied to various vehicles.
However, the hill hold control function generally has a separate on switch and a vehicle speed adjustment device, and the hill hold control function is activated after the on switch is turned on. In addition, when the speed is adjusted, the speed of the vehicle after the interference of the ramp descent control function needs to be adjusted through a vehicle speed adjusting button, the function is complicated in operation, the driving intention of a driver cannot be reflected in time, and the driving experience is poor.
Disclosure of Invention
The invention provides a ramp slow-down control method, a ramp slow-down control system and a vehicle.
The invention provides a ramp slow descending control method, which comprises the following steps:
judging whether the cross-country mode is started or not;
when the off-road mode is started, judging whether the current speed of the vehicle is in a preset speed interval or not and whether the gradient of a slope where the vehicle is located is in a preset gradient interval or not;
if the current speed of the vehicle is in the preset speed interval and the slope of the slope where the vehicle is located is in the preset slope interval, activating the ramp slow-falling control function, and controlling the vehicle to keep the current speed when the ramp slow-falling control function is activated to run;
when the vehicle is controlled to keep running at the current speed, the method further comprises the steps of detecting whether the intention of changing the current speed of the vehicle exists or not, calculating the current speed of the vehicle at the end of the intention when the intention of changing the current speed of the vehicle is detected, judging whether the current speed of the vehicle at the end of the intention is in the preset speed interval or not, and if the current speed of the vehicle at the end of the intention is in the preset speed interval, keeping the vehicle running at the current speed of the vehicle at the end of the intention by the ramp slow-down control function when the intention is finished; if the current speed of the vehicle is not within the predetermined speed interval at the end of the intention, the hill descent control function ends.
Further, while controlling the vehicle to keep running at the current speed, the method further includes implementing monitoring of the running state of the vehicle, and outputting a braking torque required to maintain the vehicle running at the current speed according to the running state of the vehicle.
Further, whether an accelerator pedal or a brake pedal is in a treaded state is detected, if the accelerator pedal or the brake pedal is in the treaded state, the current speed of the vehicle after the treading action of the accelerator pedal or the brake pedal is finished is detected, whether the current speed of the vehicle at the moment is in the preset speed interval is judged, and if the current speed of the vehicle at the moment is in the preset speed interval, the ramp-down control function keeps the vehicle to run at the current speed after the treading action is finished after the action of treading the accelerator pedal or the brake pedal is finished; and if the current speed of the vehicle is not in the preset speed interval, closing the ramp slow-falling control function.
Further, the predetermined speed interval is greater than a first speed threshold and less than a second speed threshold, and the predetermined grade threshold is greater than a first grade threshold.
The invention also provides a ramp slow descending control system, which comprises a driving mode switch, a control unit, a gradient detection device, a vehicle speed detection device and an execution device, wherein the driving mode switch is used for selecting a preset driving mode of a vehicle and transmitting the selected driving mode information to the control unit, the gradient detection device detects the gradient of a slope where the vehicle is located and transmits the gradient information to the control unit, the vehicle speed detection device detects the current speed of the vehicle and transmits the current speed information to the control unit, a preset speed interval and a preset gradient interval are stored in the control unit, when the control unit detects that the driving mode switch selects an off-road mode, the current speed of the vehicle and the gradient of the slope where the vehicle is located are analyzed, when the current speed of the vehicle is within the preset speed interval, when the slope of the slope where the vehicle is located is within the preset slope interval, the control unit starts a ramp slow-falling control function and controls the vehicle to keep running at the current speed when the ramp slow-falling control function is activated through the execution device;
the ramp-down control system further comprises a vehicle speed changing device, the control unit detects whether the driver has an intention to change the vehicle speed through the vehicle speed changing device, if so, detects the current speed of the vehicle at the end of the intention through the vehicle speed detecting device, if so, the ramp-down control function keeps the vehicle running at the current speed of the vehicle at the end of the intention; if the current speed of the vehicle is not within the predetermined speed interval at the end of the intention, the hill descent control function ends.
Furthermore, the ramp slow-falling control system further comprises a temperature detection device, the temperature detection device detects the temperature on the execution device and transmits the temperature information to the control unit, a preset temperature threshold is stored in the control unit, the control unit judges whether the temperature on the execution device exceeds the preset temperature threshold according to the temperature information, and the control unit closes the ramp slow-falling control function.
Further, the ramp slow-down control system further comprises a display device, and when the ramp slow-down control function exits or fails, the control unit displays information representing that the ramp slow-down control function exits or fails on the display device.
The invention also provides a vehicle which comprises the ramp descent control system.
In summary, in the present invention, since the off-road mode is in the same environment as the hill descent control function on the one hand and the control strategy thereof is similar to the hill descent control function on the other hand, compared with the prior art, the hill descent control function is combined in the off-road mode, and the hill descent control function can be activated only when the vehicle is in the off-road mode, which can remove the control switch of the hill descent control function and reduce the complexity of the driver operating the vehicle. On the other hand, after the condition of the hill descent control function is met, the vehicle speed is not corrected when the current speed exceeds the preset speed interval any more, the hill descent control function is activated as long as the vehicle speed is kept in the preset speed interval, the vehicle speed in the preset speed interval is not processed, and then the vehicle is controlled to keep running at the current speed when the current speed is in the preset speed interval.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic control logic diagram of a ramp descent control method according to an embodiment of the present invention.
Fig. 2 is a system block diagram of a ramp descent control system according to an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
The invention provides a ramp slow-down control method, a ramp slow-down control system and a vehicle.
Fig. 1 is a schematic control logic diagram of a ramp slow-down control method according to an embodiment of the present invention, and as shown in fig. 1, the ramp slow-down control method according to the present invention includes the following steps:
judging whether the cross-country mode is started or not;
when the off-road mode is started, judging whether the current speed of the vehicle is in a preset speed interval or not and whether the gradient of a slope where the vehicle is located is in a preset gradient interval or not;
and if the current speed of the vehicle is in a preset speed interval and the gradient of the slope where the vehicle is located is in a preset gradient interval, activating a ramp slow down Control function (HDC), and controlling the vehicle to keep running at the current speed when the ramp slow down Control function is activated.
In the embodiment, since the off-road mode is the same as the hill-drop control function in the environment and is similar to the hill-drop control function in the control strategy, compared with the prior art, the hill-drop control function is combined in the off-road mode, and the hill-drop control function can be activated only when the vehicle is in the off-road mode, so that a control switch of the hill-drop control function can be removed, and the complexity of the driver in operating the vehicle is reduced. On the other hand, after the condition of the hill descent control function is met, it is no longer when the current speed exceeds the predetermined speed interval, the vehicle speed is corrected as long as the vehicle speed is kept within the preset speed interval, the vehicle speed within the preset speed interval is not processed, but when the current speed is within a predetermined speed interval, the hill descent control function is activated, and then controls the vehicle to keep running at the current speed when the driver does not perform other operations, so that the current speed of the vehicle can be prevented from being changed by acceleration or deceleration within a predetermined speed interval, the method can control the vehicle to run at the current speed when the ramp slow-falling control function is activated, the vehicle speed can not change due to external factors such as the slope and the like, the driving intention of the driver is correctly reflected, the operation of the driver is reduced, and the driving experience is improved.
Specifically, in the present embodiment, the predetermined speed interval is an interval from the first speed threshold to the second speed threshold, and preferably, the predetermined speed interval is greater than 7Km/h and less than 40Km/h, that is, when the current speed is greater than 7Km/h and less than 40Km/h, the current speed is within the predetermined speed interval. If the current speed is less than 7Km/h or greater than 40Km/h, the hill descent control function will not be activated and will not modify the speed of the vehicle even if the vehicle is in the off-road mode.
The predetermined gradient interval is greater than the first gradient threshold, preferably the predetermined gradient interval is greater than 7% gradient, i.e. when the vehicle is on a gradient less than 7%, the hill descent control function is not activated even if the vehicle is in the off-road mode.
After the ramp-down control function is activated, the method further comprises the steps of monitoring the running state of the vehicle in real time, and outputting the braking torque required for maintaining the vehicle to run at the current speed according to the running state of the vehicle so as to control the vehicle to keep running at the current speed. When monitoring the running state of the vehicle, the monitored information may be determined according to the requirements, such as the opening degree of an accelerator pedal, the opening degree of a brake pedal, the gradient of the vehicle and/or the acceleration of the vehicle.
Further, in this embodiment, when controlling the vehicle to keep running at the current speed, the method further includes detecting whether there is an intention to change the current speed of the vehicle, calculating the current speed of the vehicle at the end of the intention when there is an intention to change the current speed of the vehicle, determining whether the current speed of the vehicle at the end of the intention is within a predetermined speed interval, and keeping the vehicle running at the current speed of the vehicle at the end of the intention when the hill-drop control function ends the intention if the current speed of the vehicle at the end of the intention is within the predetermined speed interval. If the current speed of the vehicle is not within the predetermined speed interval at the time of the termination of the intention, the hill-hold control function is terminated.
Specifically, the method continuously detects whether an accelerator pedal or a brake pedal is in a treaded state, if so, the intention of a driver is shown, detects the current speed of the vehicle after the treading action of the accelerator pedal or the brake pedal is finished, judges whether the current speed of the vehicle is in a preset speed interval, and if the current speed is in the preset speed interval, a ramp descent control function keeps the vehicle running at the current speed after the action of treading the accelerator pedal or the brake pedal is finished; if the current speed is outside the preset speed interval, the ramp descent control function is closed, the speed of the vehicle is not corrected, and when the current speed is outside the preset speed interval due to the fact that the accelerator pedal or the brake pedal is stepped on, the method further comprises giving a prompt that the ramp descent control function is closed.
And further, detecting relevant equipment, interfaces and networks with the ramp descent control function, if the temperature of the relevant equipment, interfaces and networks with the ramp descent control function is too high, and if network communication faults and/or problems occur on each communication interface, closing the ramp descent control function, and sending a fault alarm, for example, displaying the fault of the ramp descent control function through an instrument board, and prompting a driver to automatically adjust the vehicle speed.
Further, the method further comprises the step of lighting a brake lamp to remind a rear vehicle and guarantee the safety distance when the vehicle is controlled to keep running at the current speed by performing brake control on the vehicle through the ramp slow-descending control function.
In summary, in the present invention, since the off-road mode is in the same environment as the hill descent control function on the one hand and the control strategy thereof is similar to the hill descent control function on the other hand, compared with the prior art, the hill descent control function is combined in the off-road mode, and the hill descent control function can be activated only when the vehicle is in the off-road mode, which can remove the control switch of the hill descent control function and reduce the complexity of the driver operating the vehicle. On the other hand, after the condition of the hill descent control function is met, the vehicle speed is not corrected when the current speed exceeds the preset speed interval any more, the hill descent control function is activated as long as the vehicle speed is kept in the preset speed interval, the vehicle speed in the preset speed interval is not processed, and then the vehicle is controlled to keep running at the current speed when the current speed is in the preset speed interval.
Fig. 2 is a system block diagram of a ramp slow-down control system according to an embodiment of the present invention, as shown in fig. 2, the present invention further provides a ramp slow-down control system, which includes a driving mode switch 10, a control unit 20, a gradient detection device 30, a vehicle speed detection device 40 and an execution device 50, the driving mode switch 10 is used for selecting a preset driving mode of a vehicle and transmitting selected driving mode information to the control unit 20, the gradient detection device 30 detects a gradient of a slope surface on which the vehicle is located and transmits the gradient information to the control unit 20, the vehicle speed detection device 40 detects a current speed of the vehicle and transmits the current speed information to the control unit 20, a predetermined speed interval and a predetermined gradient interval are stored in the control unit 20, the control unit 20 analyzes the current speed of the vehicle and the gradient of the slope surface on which the vehicle is located when detecting that the driving mode switch 10 selects an off-road mode, when the current speed of the vehicle is within a predetermined speed interval and the slope of the slope on which the vehicle is located is within a predetermined slope interval, the control unit 20 starts the hill descent control function, and controls the vehicle to keep running at the current speed at which the hill descent control function is activated through the execution device 50.
Further, in the present embodiment, the control unit 20 may be an Electronic Stability control system (ESC), wherein the stored predetermined speed interval is a first speed threshold to a second speed threshold, and when the current speed is greater than the first speed threshold and less than the second speed threshold, the current speed is within the predetermined speed interval. The predetermined gradient section stored by the control unit 20 is greater than the first gradient threshold, and when the gradient of the slope where the vehicle is located is greater than the first gradient threshold, the control unit 20 may determine that the gradient of the slope where the vehicle is located is within the predetermined gradient section.
In the present embodiment, the gradient detecting means 30 may be an inertial sensor. The vehicle speed detection device 40 may be a vehicle speed sensor. The actuator 50 may be an electronic booster.
Further, in the present embodiment, the control system further includes a vehicle speed changing device 60, such as an accelerator pedal and/or a brake pedal, the control unit 20 detects whether the driver has an intention to change the vehicle speed through the vehicle speed changing device 60, such as whether the accelerator pedal or the brake pedal is depressed, detects the current speed of the vehicle at the end of the intention through the vehicle speed detecting device 40 if there is an intention to change the vehicle speed, and then controls the vehicle to keep the current speed of the vehicle at the end of the intention to continue traveling through the executing device 50.
Further, the system further includes a temperature detector 70, the temperature detector 70 detects the temperature of the actuator 50, such as a brake disc, and transmits the temperature information to the control unit 20, a predetermined temperature threshold is stored in the control unit 20, and according to the temperature information, it is determined whether the temperature of the actuator 50 exceeds the predetermined temperature threshold, and when the temperature of the actuator 50 exceeds the predetermined temperature threshold, the control unit 20 turns off the ramp-down control function, that is, the ramp-down control function is exited.
Further, the control system also includes a display device 80, such as a dashboard. When the hill hold control function exits or malfunctions, the control unit 20 displays information representing that the hill hold control function exits or malfunctions on the display device 80.
The control system further comprises a brake lamp 90, and when the control unit 20 brakes the vehicle through the execution device 50, the control unit 20 can light the brake lamp 90 to remind the vehicle behind to ensure the safety distance.
The invention also provides a vehicle comprising the ramp descent control system, and other technical features of the vehicle are referred to in the prior art and are not described herein again.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A ramp slow descending control method is characterized by comprising the following steps: the method comprises the following steps:
judging whether the cross-country mode is started or not;
when the off-road mode is started, judging whether the current speed of the vehicle is in a preset speed interval or not and whether the gradient of a slope where the vehicle is located is in a preset gradient interval or not;
if the current speed of the vehicle is in the preset speed interval and the slope of the slope where the vehicle is located is in the preset slope interval, activating the ramp slow-falling control function, and controlling the vehicle to keep the current speed when the ramp slow-falling control function is activated to run;
when the vehicle is controlled to keep running at the current speed, the method further comprises the steps of detecting whether the intention of changing the current speed of the vehicle exists or not, calculating the current speed of the vehicle at the end of the intention when the intention of changing the current speed of the vehicle is detected, judging whether the current speed of the vehicle at the end of the intention is in the preset speed interval or not, and if the current speed of the vehicle at the end of the intention is in the preset speed interval, keeping the vehicle running at the current speed of the vehicle at the end of the intention by the ramp slow-down control function when the intention is finished; if the current speed of the vehicle is not within the predetermined speed interval at the end of the intention, the hill descent control function ends.
2. The hill descent control method according to claim 1, wherein: in controlling the vehicle to keep running at the current speed, the method further includes implementing monitoring of the running state of the vehicle, and outputting a braking torque required to maintain the vehicle running at the current speed according to the running state of the vehicle.
3. The hill descent control method according to claim 2, wherein: detecting whether an accelerator pedal or a brake pedal is in a trampled state, if the accelerator pedal or the brake pedal is in the trampled state, detecting the current speed of the vehicle after the trampling action of the accelerator pedal or the brake pedal is finished, judging whether the current speed of the vehicle at the moment is in a preset speed interval, and if the current speed of the vehicle at the moment is in the preset speed interval, keeping the vehicle to run at the current speed after the trampling action is finished by the ramp descent control function after the trampling action is finished; and if the current speed of the vehicle is not in the preset speed interval, closing the ramp slow-falling control function.
4. The hill descent control method according to claim 1, wherein: the predetermined speed interval is greater than a first speed threshold and less than a second speed threshold, and the predetermined grade threshold is greater than a first grade threshold.
5. A ramp descent control system is characterized in that: the system comprises a driving mode switch, a control unit, a gradient detection device, a vehicle speed detection device and an execution device, wherein the driving mode switch is used for selecting a preset driving mode of a vehicle and transmitting the selected driving mode information to the control unit, the gradient detection device detects the gradient of a slope where the vehicle is located and transmits the gradient information to the control unit, the vehicle speed detection device detects the current speed of the vehicle and transmits the current speed information to the control unit, a preset speed interval and a preset gradient interval are stored in the control unit, when the control unit detects that the driving mode switch selects an off-road mode, the current speed of the vehicle and the gradient of the slope where the vehicle is located are analyzed, and when the current speed of the vehicle is in the preset speed interval and the gradient of the slope where the vehicle is located is in the preset gradient interval, the control unit starts a ramp slow-falling control function and controls the vehicle to keep running at the current speed when the ramp slow-falling control function is activated through the execution device;
the ramp-down control system further comprises a vehicle speed changing device, the control unit detects whether the driver has an intention to change the vehicle speed through the vehicle speed changing device, if so, detects the current speed of the vehicle at the end of the intention through the vehicle speed detecting device, if so, the ramp-down control function keeps the vehicle running at the current speed of the vehicle at the end of the intention; if the current speed of the vehicle is not within the predetermined speed interval at the end of the intention, the hill descent control function ends.
6. The ramp descent control system according to claim 5, wherein: the ramp slow-descending control system further comprises a temperature detection device, the temperature detection device detects the temperature on the execution device and transmits the temperature information to the control unit, a preset temperature threshold value is stored in the control unit, the control unit judges whether the temperature on the execution device exceeds the preset temperature threshold value according to the temperature information, and the control unit closes the ramp slow-descending control function.
7. The ramp descent control system according to claim 5, wherein: the ramp slow-falling control system further comprises a display device, and when the ramp slow-falling control function exits or fails, the control unit displays information representing that the ramp slow-falling control function exits or fails on the display device.
8. A vehicle, characterized in that: the vehicle comprising a hill descent control system according to any one of claims 5 to 7.
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| CN201910551655.0A CN110293971B (en) | 2019-06-24 | 2019-06-24 | Ramp slow descending control method, ramp slow descending control system and vehicle |
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| CN201910551655.0A CN110293971B (en) | 2019-06-24 | 2019-06-24 | Ramp slow descending control method, ramp slow descending control system and vehicle |
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| CN111703311A (en) * | 2020-05-25 | 2020-09-25 | 南京金龙客车制造有限公司 | Steep-slope slow-descent control method based on pure electric passenger car system |
| CN111993903A (en) * | 2020-08-24 | 2020-11-27 | 奇瑞商用车（安徽）有限公司 | Method and system for controlling gradual descent of automobile steep slope |
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