CN113911098B - HDC high-precision vehicle speed control method and system combined with cruise control - Google Patents
HDC high-precision vehicle speed control method and system combined with cruise control Download PDFInfo
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- CN113911098B CN113911098B CN202111418018.XA CN202111418018A CN113911098B CN 113911098 B CN113911098 B CN 113911098B CN 202111418018 A CN202111418018 A CN 202111418018A CN 113911098 B CN113911098 B CN 113911098B
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- 230000004913 activation Effects 0.000 claims description 12
- 238000011217 control strategy Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
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- 230000005540 biological transmission Effects 0.000 description 4
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- 230000008451 emotion Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
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Classifications
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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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
-
- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
-
- 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
- B60W30/14—Adaptive cruise control
- B60W30/143—Speed control
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Human Computer Interaction (AREA)
- Controls For Constant Speed Travelling (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
The invention provides an HDC high-precision vehicle speed control method and system combined with cruise control.A ESP arbitration controller receives an HDC switch state signal sent by an HDC switch; judging whether an HDC switch state signal is started or not, and if so, indicating that a driver requests to enter an HDC function; judging the current running road surface state of the vehicle: if the vehicle is in a downhill slope, the ESP arbitration controller acquires the current vehicle speed, and activates the HDC module when the condition is met, so that the HDC module is in an ON state; the HDC switch indicator lights are illuminated. The invention realizes accurate control of the HDC speed and reduces the driving intensity of a driver, combines cruise switch adjustment, comprises comprehensive control of EMS engine control, a TCU gearbox controller, a braking system and an instrument, and can accurately set the target speed by using the cruise switch according to different road conditions, thereby being convenient for the driver to drive the vehicle and improving the driving and controlling performances under various road conditions.
Description
Technical Field
The invention relates to the technical field of vehicle speed control, in particular to an HDC high-precision vehicle speed control method and system combined with cruise control.
Background
With the increasing promotion of the living standard of people, the light commercial vehicles are upgraded, the automobile consumer groups are younger, and the demands of people for the light commercial vehicles are not only tool-type vehicles, but also travel seats with certain comfortableness, interestingness and simple operation, and drivers can hope that the vehicles can easily drive various vehicle conditions.
At present, a vehicle adopts an accelerator pedal and a brake pedal to control the speed of the vehicle, because of engine and brake response reasons, a driver cannot accurately set a target speed of the vehicle, and particularly on a road section with more ascending and descending slopes, the accelerator pedal and the brake pedal are required to be repeatedly operated to control the speed of the vehicle, and if the vehicle is not controlled in time, the running danger is easy to be caused.
Disclosure of Invention
In order to enable a vehicle to run on a slope more safely, comfortably and simply, the invention provides the HDC high-precision vehicle speed control method combined with cruise control, which is convenient for a driver to select and improves the control performance of the vehicle.
The method comprises the following steps: the ESP arbitration controller receives an HDC switch state signal sent by the HDC switch;
judging whether an HDC switch state signal is started or not, and if so, indicating that a driver requests to enter an HDC function;
the ESP arbitration controller judges the current running road surface state of the vehicle:
if the speed is downhill, the ESP arbitration controller acquires the current speed, and when the current speed is more than 8km/h and less than 60km/h, the HDC module is activated to enable the HDC module to be in an ON state;
the HDC switch indicator lights are illuminated.
It should be further noted that, the ESP arbitration controller determines the current running road surface state of the vehicle:
if the road is a level road or an ascending slope, the HDC module is not activated;
if the current speed is less than 8km/h, the HDC module is not activated;
if the current vehicle speed is greater than 60km/h, the HDC module is deactivated.
It should be further noted that, after the HDC module is in the ON state, if the current vehicle speed is greater than the maximum vehicle speed actively controlled by the HDC, the ESP arbitration controller sends a signal for actively controlling the HDC to be in a standby state to the gateway;
the gateway sends an HDC active control standby state signal to the EMS engine controller and the TCU controller;
the HDC active control function is inactive and the meter displays the state in which the HDC active control function is inactive.
It should be further noted that, when the vehicle speed is less than the maximum vehicle speed of the HDC active control, the ESP arbitration controller sends an HDC active control activation state signal to the gateway;
the gateway sends an HDC active control activation state signal to the instrument, the EMS engine controller and the TCU controller;
the HDC active control is activated, and the instrument displays the active control function activation running state of the HDC.
It should be further noted that, the ESP arbitration controller determines whether the brake pedal state is depressed;
if the driver is stepped on, the driver is instructed to adjust the target vehicle speed through a brake pedal, and the vehicle speed is controlled through the braking process of the brake pedal;
if the brake pedal is not depressed, the ESP arbitration controller judges whether the throttle position of the engine is in an output state;
if the vehicle is in an output state, the HDC active control function is not activated, and the vehicle speed is controlled by a driver accelerator signal.
Further, when the throttle position of the engine is the minimum value, the ESP arbitration controller determines whether the current vehicle speed satisfies the HDC activation condition;
if the current speed is greater than 8km/h and less than 60km/h, activating the HDC module to enable the HDC module to be in an ON state;
the HDC switch indicator lights are illuminated.
It should be further noted that, the ESP arbitration controller determines whether the cruise control is on;
if the cruise control is started, regulating the HDC target speed by adopting a cruise switch, and sending a cruise control instruction to a gateway after the ESP arbitration controller arbitrates, wherein the gateway sends the cruise control instruction to an instrument, an EMS engine controller and a TCU controller;
and if the cruise control is not started, performing HDC control at the current determined target vehicle speed.
The ESP arbitration controller acquires current gear information, actual torque information of an engine flywheel end, engine rotation speed information and four wheel rotation speed information, judges whether the engine needs to be controlled in a torque up or torque down mode, and achieves an HDC target vehicle speed;
if the engine torque reduction is needed, the ESP arbitration controller sends an engine torque reduction activation signal to the EMS engine controller, and an engine slow torque reduction signal or an engine fast torque reduction signal; the EMS engine controller executes the torque reduction request to realize the control of the HDC target vehicle speed;
if the engine torque is required, the ESP arbitration controller sends an engine torque request signal and an engine torque value to the EMS engine controller; the EMS engine controller executes the torque up request to realize the control of the HDC target vehicle speed;
if the engine torque reduction is not needed, the ESP arbitration controller judges whether braking intervention is needed to realize the HDC target vehicle speed control;
if braking intervention is needed, the ESP arbitration controller sends a brake lamp lighting signal to the gateway, the gateway sends the brake lamp lighting signal to the EMS engine controller and the TCU controller, and the brake lamp is lightened, and meanwhile, the brake pipeline is built up to control the HDC target vehicle speed.
When the ESP arbitration controller receives the request signal for exiting the HDC switch, the ESP arbitration controller sends an HDC closing signal to the gateway, the gateway sends the HDC closing signal to the EMS engine controller and the TCU controller, the HDC switch indicator is closed, and the HDC function exits.
The invention also provides an HDC high-precision vehicle speed control system combined with cruise control, which comprises: ESP arbitration controller, HDC switch, gateway, EMS engine controller, TCU controller and control strategy signal definition module;
the ESP arbitration controller is connected with the HDC switch, and receives an HDC switch state signal sent by the HDC switch;
the ESP arbitration controller is respectively connected with the EMS engine controller and the TCU controller through a gateway to control the HDC target vehicle speed;
the control strategy signal definition module is used for respectively configuring signal names, signal contents and parameters corresponding to each control signal;
control signals communicated between the ESP arbitration controller, the EMS engine controller and the TCU controller are transmitted by signal names, signal contents and parameters.
From the above technical scheme, the invention has the following advantages:
according to the HDC high-precision vehicle speed control method and system combining cruise control, a driver can start the HDC abrupt slope descent control function in real time according to road conditions, under the condition of complex road conditions such as mountain areas and curves, the driver does not need to control an accelerator pedal and a brake pedal all the time when the function is activated, the HDC realizes the downhill speed control according to the target vehicle speed requested by the driver, the operation intensity of the driver is reduced, and the driving process is easier.
The speed of the vehicle controlled by the driver operating the pedal is greatly influenced by driving experience and emotion, and frequent braking by a novice has the risk of overheating braking. The HDC system is used for controlling the vehicle speed, so that the operation mode of an experienced driver can be simulated, the engine, the gearbox and the brake can be cooperatively controlled, the participation proportion of the brake can be effectively reduced, and the safety of long-time downhill running is improved.
The cruise switch control speed accuracy is higher, and the target speed setting can be finished in advance, so that the HDC speed control is more intelligent and finer, and the vehicle driving feeling is greatly improved.
In the invention, after the vehicle descends and the HDC function is started, a driver is required to set the target speed according to the needs, and the HDC system automatically controls the torque and the braking of the engine, so that the vehicle descends slowly with the target speed. The invention realizes accurate control of the HDC speed and reduces the driving intensity of a driver, combines cruise switch adjustment, comprises comprehensive control of EMS engine control, a TCU gearbox controller, a brake system and an instrument, and enables the driver to accurately set the target speed by using the cruise switch according to different road conditions.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description will be briefly introduced below, it being 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 schematic diagram of an HDC high-precision vehicle speed control system incorporating cruise control;
FIG. 2 is a schematic diagram of an embodiment of an HDC high-precision vehicle speed control system incorporating cruise control.
FIG. 3 is a flow chart of an HDC high-precision vehicle speed control method incorporating cruise control.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The units and algorithm steps of each example described in connection with the embodiments disclosed in the HDC high-precision vehicle speed control method and system for cruise control provided by the present invention can be implemented in electronic hardware, computer software, or a combination of both, and to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described in terms of functionality in the foregoing description. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The HDC of the present invention is a comfort function that helps the driver to descend a hill through active intervention and the vehicle controls speed without driver intervention. By pressing the HDC button, the HDC function is turned on and off. If desired, the driver may change the target speed by means of a brake pedal or an accelerator pedal, a cruise switch. The speed control precision of the brake pedal and the accelerator pedal is low, and especially, a novice driver is difficult to quickly adjust the target speed in place; the cruise switch control is added, so that the target vehicle speed can be adjusted in a grading manner according to the set control precision, and the control is accurate and simple.
The block diagram shown in the drawings of the HDC high-precision vehicle speed control method and system incorporating cruise control provided by the invention is merely a functional entity and does not necessarily correspond to a physically independent entity. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
As shown in fig. 1 to 2, the HDC high-precision vehicle speed control system incorporating cruise control provided by the present invention includes: an ESP arbitration controller 2, an HDC switch 1, a gateway 3, an EMS engine controller 4, a TCU controller 5 and a control strategy signal definition module;
the ESP arbitration controller 2 is connected with the HDC switch 1, and the ESP arbitration controller 2 receives an HDC switch 1 state signal sent by the HDC switch 1;
the ESP arbitration controller 2 is respectively connected with the EMS engine controller 4 and the TCU controller 5 through the gateway 3 to control the HDC target vehicle speed;
the control strategy signal definition module is used for respectively configuring signal names, signal contents and parameters corresponding to each control signal;
control signals communicated between the ESP arbitration controller 2, the EMS engine controller 4 and the TCU controller 5 are transmitted by signal names, signal contents and parameters.
The system can be further provided with an HDC function control system, a power system, a transmission system, a brake, an instrument system, a vehicle body control system and the like according to the actual needs of the vehicle.
The HDC function in the invention is divided into an HDC switch, an HDC indicator lamp display and a speed adjustment. The HDC switch has an on state and an off state; the HDC indicator lamp and the instrument system are matched to indicate the state of the HDC function, and three states exist in the HDC function: the HDC OFF status indicator lights are turned OFF, and the HDC ON status indicator lights (including the HDC ON Active lights and HDC ON Not Active) are turned ON; the instrument system displays different states of the HDC ON Active and HDC ON Not Active; the speed regulating system mainly comprises a braking deceleration request, an accelerator acceleration request and a cruise switch acceleration and deceleration request; the powertrain controller is abbreviated as (EMS); the transmission system is divided into a gearbox and a transfer case, the gearbox controller being abbreviated as (TCU); the instrumentation system is abbreviated as (IP); the vehicle body control system is abbreviated as (BMS), the device can coordinate the above devices, arbitrate and judge the HDC function activation selected by the driver and the vehicle speed selection, and finally decide a reasonable control mode.
After the vehicle descends and the HDC function is started, a driver is required to set a target vehicle speed according to the requirement, and the HDC system automatically controls the torque and the braking of the engine, so that the vehicle descends slowly at the target vehicle speed. The invention realizes accurate control of the HDC speed and reduces the driving intensity of a driver, combines cruise switch adjustment, comprises comprehensive control of EMS engine control, a TCU gearbox controller, a brake system and an instrument, and enables the driver to accurately set the target speed by using the cruise switch according to different road conditions.
Based on the system, the invention also provides an HDC high-precision vehicle speed control method combined with cruise control, as shown in figure 3. In the method, a control strategy signal is used as a transmission mode, and the transmission of control instructions are carried out according to defined signal names, signal contents and meanings in the control execution process.
The control strategy signal is defined as follows:
the control method of the invention comprises the following steps:
when the ESP arbitration controller receives the HDC switch request signal GW_Hdcswitch, firstly, judging whether the value of the signal GW_Hdcswitch is 0x1, if so, indicating that the driver requests to enter the HDC function, and judging whether the current road section of the vehicle is a downhill, a flat road or an uphill road by the ESP controller.
If the road is a flat road or an ascending slope, the HDC function is not activated;
if the downhill HDC function is ready to switch to the on state, the ESP arbitration controller calculates the current vehicle speed according to ESP_Wheelspeed_FL, ESP_Wheelspeed_FR, ESP_Wheelspeed_RL and ESP_Wheelspeed_RR signals, and if the current vehicle speed is less than 8km/h, the HDC function is not activated; if the current speed is greater than 60km/h, the HDC function is not activated; if the current speed is greater than 8km/h and less than 60km/h, the HDC function is in an ON state; the HDC switch indicator lights are illuminated.
After the HDC function is in an ON state, the ESP arbitration controller judges that if the current vehicle speed is greater than the maximum vehicle speed actively controlled by the HDC, taking 35km/h as an example, the ESP arbitration controller sends an ESP_HDCStatus value of 0x1 to a gateway, the gateway sends the signal value to EMS, TCU and IP, the HDC active control function is not activated, and an instrument displays HDC ON not active; when the vehicle speed is the same; the ESP arbitration controller judges that if the current vehicle speed is smaller than the HDC active control maximum vehicle speed, the ESP arbitration controller sends an ESP_HDCStatus value of 0x2 to the gateway, and the gateway sends signal values to the instrument, the EMS engine controller and the TCU controller. The HDC function is activated and the meter displays the HDC ON active.
The ESP arbitration controller determines whether EMS_BrakePedleStatus is 0x1, and if so, 0x1 indicates that the driver adjusts the target vehicle speed by the brake pedal, and the vehicle speed when 0x1 is switched to 0x0 is used as the target vehicle speed to perform the HDC control.
If the value is 0x0, the ESP arbitration controller judges whether EMS_ThrottleP is a certain value between 0x1 and 0xFF, if the value is a certain value between 0x1 and 0xFF, the driver is proved to step on the accelerator pedal to actively accelerate, the HDC active control function is not activated, and the vehicle speed is controlled by a driver accelerator signal;
when EMS_ThrottlePosition is 0x0, the ESP arbitration controller judges whether the current vehicle speed meets the HDC activation condition in the above manner.
The ESP arbitration controller judges whether EMS_CruiseControlStatus is a certain value of 0x1, 0x2, 0x3, 0x4, 0x5, 0x6 and 0x7, if so, the ESP arbitration controller sends ESP_HDCStatus to the gateway after arbitration by the ESP arbitration controller, and the gateway sends the signal value to the instrument, the EMS engine controller and the TCU controller. If EMS_CruiseControlStatus is 0x0, HDC control is performed at the current determined target vehicle speed.
The ESP arbitration controller receives TCU_ CurrentGear, EMS _ EffectiveEngineTorque, EMS _ EngineSpeed, ESP _Wheelspeed_FL, ESP_Wheelspeed_FR, ESP_Wheelspeed_RL, and ESP_Wheelspeed_RR to determine whether an engine up-torque or down-torque is required to achieve the HDC target vehicle speed, and if an engine down-torque is required, the ESP arbitration controller sends an ESP_Basc signal value 0x1, an ESP_TorqLow or an ESP_TorqFast signal value between 0x1 and 0Xffe to the EMS engine controller.
The EMS engine controller executes the torque reducing request; if the engine torque up is needed, the ESP arbitration controller sends an ESP_TorTorIncSt signal value 0x1 and a certain value between the ESP_TorTorTorIncreate signal value 0x1 and 0Xffe to the EMS engine controller, and the EMS engine controller executes the torque up request; and realizing the HDC target vehicle speed. If the engine torque reduction is not needed, the ESP arbitration controller judges whether braking intervention is needed to achieve the HDC target speed, if the braking intervention is needed, the ESP arbitration controller sends an ESP_BLRequestController signal value 0x0 to a gateway, the gateway sends the signal value to an instrument, an EMS engine controller and a TCU controller, a brake lamp is turned on, meanwhile, a brake pipeline is built up, and the HDC target speed is controlled.
When the ESP arbitration controller receives the HDC switch request signal GW_Hdcswitch to be switched to 0x0, the driver requests to exit the HDC control, the ESP arbitration controller sends an ESP_HDCStatus signal value 0x0 to the gateway, the gateway sends the signal value to the meter, the EMS engine controller and the TCU controller, the HDC ON information of the meter is not displayed any more, the HDC switch indicator is turned off, and the HDC function exits.
According to the HDC high-precision vehicle speed control method and system combining cruise control, a driver can start the HDC abrupt slope descent control function in real time according to road conditions, under the condition of complex road conditions such as mountain areas and curves, the driver does not need to control an accelerator pedal and a brake pedal all the time when the function is activated, the HDC realizes the downhill speed control according to the target vehicle speed requested by the driver, the operation intensity of the driver is reduced, and the driving process is easier.
The speed of the vehicle controlled by the driver operating the pedal is greatly influenced by driving experience and emotion, and frequent braking by a novice has the risk of overheating braking. The HDC system is used for controlling the vehicle speed, so that the operation mode of an experienced driver can be simulated, the engine, the gearbox and the brake can be cooperatively controlled, the participation proportion of the brake can be effectively reduced, and the safety of long-time downhill running is improved.
The cruise switch control speed accuracy is higher, and the target speed setting can be finished in advance, so that the HDC speed control is more intelligent and finer, and the vehicle driving feeling is greatly improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An HDC high-precision vehicle speed control method combined with cruise control is characterized in that the method comprises the following steps:
the ESP arbitration controller receives an HDC switch state signal sent by the HDC switch;
judging whether an HDC switch state signal is started or not, and if so, indicating that a driver requests to enter an HDC function;
the ESP arbitration controller judges the current running road surface state of the vehicle:
if the speed is downhill, the ESP arbitration controller acquires the current speed, and when the current speed is more than 8km/h and less than 60km/h, the HDC module is activated to enable the HDC module to be in an ON state;
the HDC switch indicator lights are lightened;
the ESP arbitration controller acquires current gear information, actual torque information of an engine flywheel end, engine rotation speed information and four wheel rotation speed information, judges whether the engine needs to be controlled in a torque up or torque down mode, and achieves an HDC target vehicle speed;
if the engine torque reduction is needed, the ESP arbitration controller sends an engine torque reduction activation signal to the EMS engine controller, and an engine slow torque reduction signal or an engine fast torque reduction signal; the EMS engine controller executes the torque reduction request to realize the control of the HDC target vehicle speed;
if the engine torque is required, the ESP arbitration controller sends an engine torque request signal and an engine torque value to the EMS engine controller; the EMS engine controller executes the torque up request to realize the control of the HDC target vehicle speed;
if the engine torque reduction is not needed, the ESP arbitration controller judges whether braking intervention is needed to realize the HDC target vehicle speed control;
if braking intervention is needed, the ESP arbitration controller sends a brake lamp lighting signal to the gateway, the gateway sends the brake lamp lighting signal to the EMS engine controller and the TCU controller, and the brake lamp is lighted and the brake pipeline is simultaneously pressurized to control the HDC target vehicle speed.
2. The HDC high-precision vehicle speed control method according to claim 1, wherein the ESP arbitration controller judges the current running road surface state of the vehicle:
if the road is a level road or an ascending slope, the HDC module is not activated;
if the current speed is less than 8km/h, the HDC module is not activated;
if the current vehicle speed is greater than 60km/h, the HDC module is deactivated.
3. The HDC high-precision vehicle speed control method incorporating cruise control according to claim 1, characterized in that,
after the HDC module is in an ON state, if the current vehicle speed is greater than the maximum vehicle speed actively controlled by the HDC, the ESP arbitration controller sends a signal for actively controlling the HDC to be in a standby state to the gateway;
the gateway sends an HDC active control standby state signal to the EMS engine controller and the TCU controller;
the HDC active control function is inactive and the meter displays the state in which the HDC active control function is inactive.
4. The HDC high-precision vehicle speed control method incorporating cruise control according to claim 3, characterized in that,
when the vehicle speed is smaller than the maximum vehicle speed actively controlled by the HDC, the ESP arbitration controller sends an HDC active control activation state signal to the gateway;
the gateway sends an HDC active control activation state signal to the instrument, the EMS engine controller and the TCU controller;
the HDC active control is activated, and the instrument displays the active control function activation running state of the HDC.
5. The HDC high-precision vehicle speed control method incorporating cruise control according to claim 1, characterized in that,
the ESP arbitration controller judges whether the brake pedal state is stepped on;
if the driver is stepped on, the driver is instructed to adjust the target vehicle speed through a brake pedal, and the vehicle speed is controlled through the braking process of the brake pedal;
if the brake pedal is not depressed, the ESP arbitration controller judges whether the throttle position of the engine is in an output state;
if the vehicle is in an output state, the HDC active control function is not activated, and the vehicle speed is controlled by a driver accelerator signal.
6. The HDC high-precision vehicle speed control method incorporating cruise control according to claim 1, characterized in that,
when the throttle position of the engine is the minimum value, the ESP arbitration controller judges whether the current vehicle speed meets the HDC activation condition;
and if the current speed is greater than 8km/h and less than 60km/h, activating the HDC module to enable the HDC module to be in an ON state.
7. The HDC high-precision vehicle speed control method incorporating cruise control according to claim 1, characterized in that,
the ESP arbitration controller judges whether the cruise control is started or not;
if the cruise control is started, regulating the HDC target speed by adopting a cruise switch, and sending a cruise control instruction to a gateway after the ESP arbitration controller arbitrates, wherein the gateway sends the cruise control instruction to an instrument, an EMS engine controller and a TCU controller;
and if the cruise control is not started, performing HDC control at the current determined target vehicle speed.
8. The HDC high-precision vehicle speed control method incorporating cruise control according to claim 1, characterized in that,
when the ESP arbitration controller receives the request signal for exiting the HDC switch, the ESP arbitration controller sends an HDC closing signal to the gateway, the gateway sends the HDC closing signal to the EMS engine controller and the TCU controller, the HDC switch indicator is closed, and the HDC function exits.
9. An HDC high-precision vehicle speed control system incorporating cruise control, characterized in that the system employs the HDC high-precision vehicle speed control method incorporating cruise control as claimed in any one of claims 1 to 8;
the system comprises: ESP arbitration controller, HDC switch, gateway, EMS engine controller, TCU controller and control strategy signal definition module;
the ESP arbitration controller is connected with the HDC switch, and receives an HDC switch state signal sent by the HDC switch;
the ESP arbitration controller is respectively connected with the EMS engine controller and the TCU controller through a gateway to control the HDC target vehicle speed;
the control strategy signal definition module is used for respectively configuring signal names, signal contents and parameters corresponding to each control signal;
control signals communicated between the ESP arbitration controller, the EMS engine controller and the TCU controller are transmitted by signal names, signal contents and parameters.
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