CN104742904A - Cruise control method and system - Google Patents
Cruise control method and system Download PDFInfo
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- CN104742904A CN104742904A CN201510137786.6A CN201510137786A CN104742904A CN 104742904 A CN104742904 A CN 104742904A CN 201510137786 A CN201510137786 A CN 201510137786A CN 104742904 A CN104742904 A CN 104742904A
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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, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- 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
- 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
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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
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
- B60W10/11—Stepped gearings
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine 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
- B60W2540/215—Selection or confirmation of options
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0616—Position of fuel or air injector
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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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/10—Change speed gearings
- B60W2710/1005—Transmission ratio engaged
Abstract
The invention discloses a cruise control method and system of an automobile. Through a cruise control torque requirement calculation module in the cruise control system is used for receiving an engine rotation speed signal and a current cruise target speed input by a driver, a gearbox control module is used for obtaining a current cruise target speed signal and a current simulation accelerator opening signal to execute corresponding clutch control and gear control, and finally a system torque coordination module is used for controlling an engine ignition angle and a throttle opening degree to obtain current required torque, so that in the cruise control process, the automobile achieves downshifting fast acceleration or downshifting fast deceleration. According to the cruise control method, an automatic gearbox control unit and an engine controller are effectively combined, the problem that in the prior art, in the cruise control process, the automobile can not achieve fast acceleration and fast deceleration is solved, the automobile can make a faster response when encountering risks in the cruise control process, and the driving safety of the automobile in the cruise control process is further improved.
Description
Technical field
The present invention relates to automobile technical field, particularly relate to a kind of cruise control method and system of automobile.
Background technology
The existing cruise control method of automobile is respond the speed of a motor vehicle of cruising that chaufeur sets by means of only engine controller side, to ensure the convenience that system realizes and to drive the ride comfort felt, but because driving engine exists the delay of long period from air inlet to acting output torque, therefore, this kind of cruise control method cannot respond fast to the urgency acceleration of chaufeur and anxious deceleration demand, limits the application operating mode of cruise function.
Summary of the invention
The object of the embodiment of the present invention is the problem that cannot meet special driving demand existed to solve existing cruise control method, provides a kind of cruise control method and system of in conjunction with gearbox control, gear and power-transfer clutch being carried out to Comprehensive Control.
To achieve these goals, the technical solution used in the present invention is:
A kind of cruise control method, comprising:
Obtain the current cruise target speed of chaufeur input;
According to described current cruise target speed, calculate current cruise target moment of torsion;
According to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, obtain the virtual throttle aperture of corresponding described current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree;
When described current cruise target speed is greater than or equal to current cruising speed, if described current cruise target moment of torsion is greater than the current max. output torque of driving engine, then:
According to described current virtual accelerator open degree and current vehicle speed, determine that accelerating downshift type exports Automatic Transmission control unit to, performs corresponding clutch control and shift control to make described Automatic Transmission control unit according to described acceleration downshift type;
The urgency that described Automatic Transmission control unit exports corresponding described acceleration downshift type to engine controller accelerates torque request and described current cruise target moment of torsion, to make engine controller comprise the described anxious all torque demand determination current demand moments of torsion accelerating torque request and described current cruise target moment of torsion according to what receive, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
Preferably, described method also comprises:
When described current cruise target speed is less than current cruising speed, if the rate of change of the relatively current cruising speed of described current cruise target speed is less than or equal to anxious threshold value of slowing down, then:
Current vehicle speed is multiplied by downshift coefficient in advance, is revised current vehicle speed;
According to described current virtual accelerator open degree with revised current vehicle speed, determine that anxious deceleration downshift type exports Automatic Transmission control unit to, perform corresponding clutch control and shift control to make described Automatic Transmission control unit according to described anxious deceleration downshift type;
Described Automatic Transmission control unit exports the anxious deceleration torque request of corresponding described anxious deceleration downshift type to engine controller, to make engine controller according to all torque demand determination current demand moments of torsion comprising described current cruise target moment of torsion and described anxious deceleration torque request received, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
Preferably, described method also comprises:
When described current cruise target speed is less than current cruising speed, if the rate of change of the relatively current cruising speed of described current cruise target speed is greater than anxious threshold value of slowing down, then:
According to described current virtual accelerator open degree and current vehicle speed, determine that deceleration downshift type exports Automatic Transmission control unit to, perform corresponding clutch control and shift control to make described Automatic Transmission control unit according to described deceleration downshift type;
Described Automatic Transmission control unit exports the deceleration torque request of corresponding described deceleration downshift type to engine controller, to make engine controller according to all torque demand determination current demand moments of torsion comprising described current cruise target moment of torsion and described deceleration torque request received, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
Preferably, described according to described current cruise target speed, calculate current cruise target moment of torsion and comprise:
Calculate the difference between described current cruise target speed and current cruising speed, obtain current cruising speed variable quantity;
Obtain the current overall gear ratio of automotive transmission;
According to the data reflecting corresponding relation between the current overall gear ratio of automotive transmission and PID adjustment factor, obtain the PID adjustment factor of corresponding described current overall gear ratio as current PID adjustment factor;
According to described previous cycle velocity variable and described current PID adjustment factor, calculate current cruise target moment of torsion.
Preferably, described according to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, the virtual throttle aperture obtaining corresponding described current cruise target moment of torsion and present engine rotating speed comprises as current virtual accelerator open degree:
According to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, obtain the virtual throttle aperture of corresponding described current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree by interpolation.
Preferably, described current virtual accelerator open degree is less than the virtual throttle aperture when urgency acceleration downshift request of described Automatic Transmission control unit and anxious deceleration downshift request, then:
Show the output torque of present engine can maintain current shift under vehicle operating, now described Automatic Transmission control unit stops getting involved the control to described current cruising speed.
A kind of CCS cruise control system, comprising:
Control torque demand of cruising computing module, this module is for receiving the current cruise target speed of engine rotational speed signal and chaufeur input, current cruise target moment of torsion is converted into by transfer function, according to described current cruise target moment of torsion in conjunction with described engine rotational speed signal, utilize linear interpolation formula y=y0+ α (y1-y0) to calculate current virtual accelerator opening amount signal, and export described current virtual accelerator opening amount signal to Automatic Transmission control unit;
Transmission Control Module, this module is for receiving current cruise target speed signal and current virtual accelerator opening amount signal, and the described current cruise target speed signal obtained by Automatic Transmission control unit and described current virtual accelerator opening amount signal perform corresponding clutch control and shift control
System torque Coordination module, this module accelerates torque request or anxious deceleration torque request and described current cruise target moment of torsion for the urgency receiving described Automatic Transmission control unit and export to engine controller, to make engine controller comprise the described anxious all torque demand determination current demand moments of torsion accelerating torque request or described anxious deceleration torque request and described current cruise target moment of torsion according to what receive, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
Beneficial effect of the present invention is:
The cruise control method of a kind of automobile of the present invention and system, the current cruise target speed of engine rotational speed signal and chaufeur input is received by the control torque demand computing module that cruises in CCS cruise control system, then transfer function is utilized to be converted into current cruise target moment of torsion, according to current cruise target moment of torsion in conjunction with described engine rotational speed signal, linear interpolation formulae discovery is utilized to obtain current virtual accelerator opening amount signal, and export current virtual accelerator opening amount signal to Automatic Transmission control unit, and then the current cruise target speed signal utilizing Transmission Control Module to obtain and current virtual accelerator opening amount signal perform corresponding clutch control and shift control, receive finally by system torque Coordination module urgency that automatic gear box control unit exports to engine controller and accelerate torque request or anxious deceleration torque request and described current cruise target moment of torsion, the anxious all torque demand determination current demand moments of torsion accelerating torque request or anxious deceleration torque request and current cruise target moment of torsion are comprised according to what receive to make engine controller, and realize described current demand moment of torsion complete that the downshift of automobile in cruise Control is anxious to be accelerated or downshift is anxious slows down by controlling engine ignition angle and throttle opening.Automatic Transmission control unit and engine controller have been carried out actv. combination by cruise control method of the present invention, solve automobile before this by this cruise control method and cannot carry out anxious acceleration and anxious problem of slowing down in cruise Control, not only increase chaufeur and cruise the Driving in controlling, can also make simultaneously automobile face a danger in cruise Control situation time can make and reacting more rapidly, improve the driving safety of automobile in cruise Control further.
Accompanying drawing explanation
Next will be described in further detail specific embodiments of the invention by reference to the accompanying drawings, wherein:
Fig. 1 is the Systematical control block diagram of the embodiment of the present invention;
Fig. 2 is the gearshift line calibration method schematic diagram of the embodiment of the present invention;
Fig. 3 is the system decision flow chart of the embodiment of the present invention;
Mark in upper figure:
1, control torque demand of cruising computing module 2, Transmission Control Module
3, system torque Coordination module
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
As shown in Figure 1, the cruise control method of a kind of automobile of the present invention is as follows:
S1: read automobile cruise switch signal.
S2: according to the automobile cruise switch signal obtained, by calculating the current cruise target speed obtaining chaufeur input.
S3: according to current cruise target speed, calculates current cruise target moment of torsion.
S4: according to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, obtain the virtual throttle aperture of corresponding current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree.
S5: the judgement carrying out anxious acceleration request or anxious deceleration request according to current cruise target speed and current cruise target moment of torsion.
S51: if be judged as anxious acceleration request, when namely current cruise target speed is greater than or equal to current cruising speed, be done as follows:
S511: confirm that current cruise target moment of torsion is greater than the current max. output torque of driving engine.
S512: the gearshift line of downshift is accelerated in inquiry, and according to current virtual accelerator open degree and current vehicle speed, determine to accelerate downshift type.
S513: will speed up downshift type and export Automatic Transmission control unit to, performs corresponding clutch control and shift control to make Automatic Transmission control unit according to accelerating downshift type.
S514: or directly carry out engine torque increase control.
S515: Automatic Transmission control unit exports the corresponding urgency accelerating downshift type to engine controller and accelerates torque request and current cruise target moment of torsion, the anxious all torque demand determination current demand moments of torsion accelerating torque request and current cruise target moment of torsion are comprised according to what receive to make engine controller, and realize described current demand moment of torsion by control engine ignition angle and throttle opening, finally complete anxious acceleration request.
S52: if be judged as anxious deceleration request, when current cruise target speed is less than current cruising speed, be done as follows:
S521: Automatic Transmission control unit exports the deceleration torque request of corresponding deceleration downshift type to engine controller, to make engine controller according to all torque demand determination current demand moments of torsion comprising current cruise target moment of torsion and deceleration torque request received, and reduce the ignition angle of driving engine.
S522: the throttle opening reducing driving engine, namely reduces the suction quantity of driving engine to realize current demand moment of torsion.
S523: be confirmed whether to reach downshift point.
S524: according to the judgement reaching downshift point, decelerating downshift type is exported to Automatic Transmission control unit, performs corresponding clutch control and shift control to make Automatic Transmission control unit according to deceleration downshift type.
S525: or directly by reducing the ignition angle of driving engine.
S526: the throttle opening reducing driving engine, namely reduces the suction quantity of driving engine.
S527: finally complete anxious deceleration request.
As shown in Figure 2, the CCS cruise control system of a kind of automobile of the present invention, the current cruise target speed of engine rotational speed signal and chaufeur input is received by the control torque demand computing module 1 that cruises in CCS cruise control system, then transfer function is utilized to be converted into current cruise target moment of torsion, according to current cruise target moment of torsion in conjunction with described engine rotational speed signal, obtain the virtual throttle aperture of corresponding current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree, when current cruise target speed is greater than or equal to current cruising speed, if current cruise target moment of torsion is greater than the current max. output torque of driving engine, then according to current virtual accelerator open degree and current vehicle speed, determine that accelerating downshift type exports Automatic Transmission control unit to, when current cruise target speed is less than current cruising speed, if the rate of change of the relatively current cruising speed of current cruise target speed is less than or equal to anxious threshold value of slowing down, then current vehicle speed is multiplied by downshift coefficient in advance, is revised current vehicle speed, according to current virtual accelerator open degree with revised current vehicle speed, determine that anxious deceleration downshift type exports Automatic Transmission control unit to, when current cruise target speed is less than current cruising speed, if the rate of change of the relatively current cruising speed of current cruise target speed is greater than anxious threshold value of slowing down, then according to current virtual accelerator open degree and current vehicle speed, determine that deceleration downshift type exports Automatic Transmission control unit to, after completing above-mentioned three steps confirmations, the current cruise target speed signal utilizing Transmission Control Module 2 to obtain and current virtual accelerator opening amount signal perform corresponding clutch control and shift control, receive finally by system torque Coordination module 3 urgency that automatic gear box control unit exports to engine controller and accelerate torque request or anxious deceleration torque request and described current cruise target moment of torsion, the anxious all torque demand determination current demand moments of torsion accelerating torque request or anxious deceleration torque request and current cruise target moment of torsion are comprised according to what receive to make engine controller, and realize described current demand moment of torsion complete that the downshift of automobile in cruise Control is anxious to be accelerated or downshift is anxious slows down by controlling engine ignition angle and throttle opening.
As shown in Figure 2, above-mentioned cruise control method is mainly by control torque demand of the cruising computing module 1 in CCS cruise control system, Transmission Control Module 2 and system torque Coordination module 3 cooperatively interact to realize, and reaction is mainly cruise control switch at the control mechanism of driver side, general cruise control buttons is arranged on vehicle steering or control panel, no matter which kind of cruise control buttons is provided with main switch, set/-, resume/+, these four buttons of cancel, the different voltages that control unit of engine inputs according to cruise control switch carry out on-off signal identification, wherein the voltage signal table of each button is as follows:
| Function | Magnitude of voltage (v) |
| Main switch is closed | 0.71 |
| Cancel | 1.51 |
| Resume/+ | 2.43 |
| set/- | 3.33 |
| Main switch is opened | 4.31 |
According to upper table, when vehicle is in cruising condition, chaufeur can realize different cruise acceleration and deceleration of cruising by operating different buttons, wherein:
(1), when pressing resume/+ key (key press time is less than 0.5 second), engine controller is judged to be an acceleration of cruising.
(2), when length presses resume/+ key (key press time is greater than 0.5 second), engine controller is judged to be normal acceleration of cruising.
(3), when pressing set/-key (key press time is less than 0.5 second), engine controller is judged to be a deceleration of cruising.
(4), when length presses set/-key (key press time is greater than 0.5 second), engine controller is judged to be long deceleration of cruising.
In addition, control above-mentioned cruising, mainly using the difference of current cruise target speed and current vehicle speed as the input controlled of cruising, wherein the method for calculating of current cruise target speed is as follows:
(1), when cruising an acceleration or putting deceleration, current cruise target speed=current vehicle speed +/-5km/h
(2), when length of cruising is accelerated or length is slowed down, current cruise target speed=current vehicle speed × (acceleration/accel × key press time of the current cruise target speed of 1+)
Wherein, the acceleration/accel of current cruise target speed can be drawn by following table inquiry:
| Current vehicle speed | 40 | 60 | 80 | 90 | 100 | 120 | 140 | 240 |
| Acceleration/accel | 0.74988 | 0.45018 | 0.22 | 0.20008 | 0.20008 | 0.20008 | 0.20008 | 0.20008 |
Current cruise target moment of torsion can according to previous cycle velocity variable and current PID adjustment factor, by calculating.The computing formula of current cruise target moment of torsion is:
Wherein, Kp is proportionality coefficient, and Ki is the integration time constant, and Kd is derivative time constant, and Kp, Ki, Kd are to vehicle transmission than relevant amount, can be obtained by proportionality coefficient question blank below:
According to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, obtain the virtual throttle aperture of corresponding current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree, concrete current virtual accelerator open degree question blank following (X-axis represents current cruise target moment of torsion, and Y-axis represents present engine rotating speed):
| 0.0 | 7.0 | 14.0 | 21.0 | 30.0 | 35.0 | 41.0 | 47.0 | 53.0 | 63.0 | 73.0 | 84.0 | 94 | 100 | 110 | |
| 700.0 | 0.0 | 3.2 | 6.4 | 9.2 | 10.9 | 11.8 | 13.0 | 14.2 | 15.5 | 17.6 | 20.7 | 25.7 | 36.3 | 47.2 | 73.4 |
| 1000.0 | 0.0 | 4.7 | 9.1 | 10.6 | 12.5 | 13.6 | 14.9 | 16.2 | 17.5 | 20.2 | 23.1 | 28.4 | 39.0 | 50.4 | 77.0 |
| 1400.0 | 0.0 | 6.2 | 10.0 | 12.0 | 14.3 | 15.5 | 16.8 | 18.2 | 19.8 | 22.5 | 25.9 | 31.9 | 42.9 | 54.9 | 81.8 |
| 1800.0 | 0.0 | 7.9 | 11.3 | 13.8 | 16.2 | 17.5 | 19.1 | 20.7 | 22.3 | 25.3 | 29.0 | 35.4 | 45.9 | 59.0 | 85.0 |
| 2200.0 | 0.0 | 9.2 | 13.0 | 15.3 | 18.1 | 19.4 | 21.1 | 22.7 | 24.5 | 27.5 | 31.6 | 38.0 | 49.7 | 62.6 | 87.6 |
| 2600.0 | 0.0 | 10.1 | 14.2 | 16.6 | 19.5 | 20.9 | 22.7 | 24.5 | 26.3 | 29.7 | 33.7 | 40.0 | 52.8 | 65.6 | 88.7 |
| 3000.0 | 0.0 | 11.0 | 14.9 | 17.7 | 20.6 | 22.1 | 24.0 | 25.8 | 27.7 | 31.2 | 35.2 | 41.8 | 55.7 | 68.3 | 89.4 |
| 3500.0 | 0.0 | 11.7 | 15.5 | 18.4 | 21.5 | 23.1 | 25.1 | 27.1 | 29.1 | 32.6 | 36.7 | 43.7 | 58.40 | 70.70 | 90.00 |
| 4000.0 | 0.0 | 12.5 | 16.2 | 19.2 | 22.5 | 24.3 | 26.4 | 28.4 | 30.4 | 33.9 | 38.3 | 45.2 | 60.70 | 73.00 | 90.60 |
| 4500.0 | 0.0 | 13.1 | 16.8 | 19.7 | 23.1 | 24.9 | 27.0 | 29.0 | 31.0 | 34.8 | 39.6 | 47.5 | 62.80 | 75.10 | 91.10 |
| 5000.0 | 0.0 | 13.6 | 17.4 | 20.3 | 23.7 | 25.5 | 27.7 | 29.7 | 31.8 | 35.6 | 41.0 | 49.5 | 65.00 | 77.00 | 91.60 |
| 6000.0 | 0.0 | 14.0 | 18.6 | 21.6 | 25.0 | 26.8 | 29.0 | 31.1 | 33.5 | 38.2 | 43.5 | 52.6 | 67.70 | 78.90 | 92.20 |
The principle of work of cruise control method of the present invention is as follows:
(1), a realization accelerated of cruising refers to that chaufeur passes through the resume/+ key pressed on cruise control buttons, current cruise target speed is increased with the steady speed of 5km/h, if the gradient that current cruise target speed increases is per second when being less than 10km/h, engine controller judges that this acceleration request belongs to general acceleration request, after engine controller receives the on-off signal of cruise control buttons, calculate the difference between current cruise target speed and current vehicle speed, and according to the automobile current drive ratio judged in engine controller, through interpolation arithmetic, obtain the proportionality coefficient that PID controls, integral coefficient and differential coefficient, calculate current cruise target moment of torsion, when this current cruise target moment of torsion is less than or equal to the current max. output torque of driving engine, by increasing the torque peak that engine ignition angle realizes under current rotating speed fast, and increase the aperture of throttle gate, increase suction quantity, continue to improve engine torque until current cruise target moment of torsion is accomplished, thus complete the general acceleration request of chaufeur.
(2), a realization of slowing down of cruising refers to that chaufeur passes through the set/-key pressed on cruise control buttons, current cruise target speed is successively decreased with the steady speed of 5km/h, if the gradient that current cruise target speed increases is per second when being less than-10km/h, engine controller judges that this acceleration request belongs to general deceleration request, after engine controller receives the on-off signal of cruise control buttons, calculate the difference between current cruise target speed and current vehicle speed, and according to the automobile current drive ratio judged in engine controller, through interpolation arithmetic, obtain the proportionality coefficient that PID controls, integral coefficient and differential coefficient, calculate current cruise target moment of torsion, by reducing the minimal torque that engine ignition angle realizes under current rotating speed fast, and reduce aperture and the suction quantity of throttle gate, continue to reduce engine torque until current cruise target moment of torsion is accomplished, thus complete the general deceleration request of chaufeur.
(3), the anxious realization accelerated of cruising refers to that chaufeur passes through the long resume/+ key pressed on cruise control buttons and current cruise target speed is increased fast, if the gradient that current cruise target speed increases is per second when being greater than 15km/h, engine controller judges that this acceleration request belongs to anxious acceleration request, after engine controller receives the on-off signal of cruise control buttons, calculate the difference between current cruise target speed and current vehicle speed, and according to the automobile current drive ratio judged in engine controller, through interpolation arithmetic, obtain the proportionality coefficient that PID controls, integral coefficient and differential coefficient, calculate current cruise target moment of torsion, when this current cruise target moment of torsion is less than or equal to the current max. output torque of driving engine, by increasing the max. output torque that engine ignition angle realizes under present engine rotating speed fast, and by increasing aperture and the suction quantity of throttle gate fast, continue to improve engine torque until current cruise target moment of torsion is accomplished, thus complete the anxious acceleration request of chaufeur.And when current cruise target moment of torsion is greater than the current max. output torque of driving engine, control only by engine controller will make the anxious booster response time elongated, now Automatic Transmission control unit is by inquiry control gearshift line options target gear of cruising as shown in Figure 3, carry out the operation of acceleration downshift, simultaneously according to accelerating the different clutch pressure control strategy of downshift type selecting, in the process, Automatic Transmission control unit can export the corresponding urgency accelerating downshift type to engine controller and accelerate torque request and current cruise target moment of torsion, and the max. output torque realized by quick increase engine ignition angle under present engine rotating speed, also by increasing aperture and the suction quantity of throttle gate fast, continue to improve engine torque until current cruise target moment of torsion is accomplished, thus complete the anxious acceleration request of chaufeur.
It is to be noted, the calibration strategy accelerating the type selecting of downshift and the gearshift line shown in Fig. 3 has direct relation, shown in Fig. 3 is the gearshift line calibration curve controlled that cruises, wherein solid line is upshift line, dotted line is downshift line, black arrow is by the speed of a motor vehicle inverse current virtual accelerator open degree out that cruises in the ban, three dark node are the intersection point of current virtual accelerator open degree and three downshift lines, represent the low gear that may hang up, suppose that now vehicle operating is at 6 gears, if the current virtual accelerator open degree calculated is greater than 40%, 60% and 85%, corresponding triggering will stop the beginning from 6 and fall a gear, fall two gears and fall three operations kept off, corresponding clutch control strategy is: when reducing to 5 gear by 6 gears, Automatic Transmission control unit can send to engine controller and suddenly accelerate torque request, the corresponding raising engine torque of engine controller keeps off corresponding axle rotating speed to improve engine speed to 5, after engine speed has promoted, the moment of torsion of power-transfer clutch carries out alternately, after moment of torsion alternately terminates, gearshift completes.And from 6 stop begin fall two gear and fall three gear operations can carry out in turn.
(4), anxious realization of slowing down of cruising refers to that chaufeur passes through the long set/-key pressed on cruise control buttons, current cruise target speed is reduced fast, if the gradient that current cruise target speed reduces is per second when being greater than-15km/h, engine controller judges that this deceleration request belongs to anxious deceleration request, after engine controller receives the on-off signal of cruise control buttons, calculate the difference between current cruise target speed and current vehicle speed, and according to the automobile current drive ratio judged in engine controller, through interpolation arithmetic, obtain the proportionality coefficient that PID controls, integral coefficient and differential coefficient, calculate current cruise target moment of torsion, and the minimum output torque realized by quick minimizing engine ignition angle under present engine rotating speed, and by reducing aperture and the suction quantity of throttle gate fast, continue to reduce engine torque until the speed of a motor vehicle reduces to deceleration downshift point, and then utilize driving engine to brake by deceleration downshift, thus complete the anxious deceleration request of chaufeur.
Structure of the present invention, feature and action effect is described in detail above according to graphic shown embodiment; the foregoing is only preferred embodiment of the present invention; but the present invention does not limit practical range with shown in drawing; every change done according to conception of the present invention; or be revised as the Equivalent embodiments of equivalent variations; do not exceed yet specification sheets with diagram contain spiritual time, all should in protection scope of the present invention.
Claims (7)
1. a cruise control method, is characterized in that, comprising:
Obtain the current cruise target speed of chaufeur input;
According to described current cruise target speed, calculate current cruise target moment of torsion;
According to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, obtain the virtual throttle aperture of corresponding described current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree;
When described current cruise target speed is greater than or equal to current cruising speed, if described current cruise target moment of torsion is greater than the current max. output torque of driving engine, then:
According to described current virtual accelerator open degree and current vehicle speed, determine that accelerating downshift type exports Automatic Transmission control unit to, performs corresponding clutch control and shift control to make described Automatic Transmission control unit according to described acceleration downshift type;
The urgency that described Automatic Transmission control unit exports corresponding described acceleration downshift type to engine controller accelerates torque request and described current cruise target moment of torsion, to make engine controller comprise the described anxious all torque demand determination current demand moments of torsion accelerating torque request and described current cruise target moment of torsion according to what receive, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
2. cruise control method according to claim 1, is characterized in that, also comprises:
When described current cruise target speed is less than current cruising speed, if the rate of change of the relatively current cruising speed of described current cruise target speed is less than or equal to anxious threshold value of slowing down, then:
Current vehicle speed is multiplied by downshift coefficient in advance, is revised current vehicle speed;
According to described current virtual accelerator open degree with revised current vehicle speed, determine that anxious deceleration downshift type exports Automatic Transmission control unit to, perform corresponding clutch control and shift control to make described Automatic Transmission control unit according to described anxious deceleration downshift type;
Described Automatic Transmission control unit exports the anxious deceleration torque request of corresponding described anxious deceleration downshift type to engine controller, to make engine controller according to all torque demand determination current demand moments of torsion comprising described current cruise target moment of torsion and described anxious deceleration torque request received, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
3. cruise control method according to claim 1, is characterized in that, also comprises:
When described current cruise target speed is less than current cruising speed, if the rate of change of the relatively current cruising speed of described current cruise target speed is greater than anxious threshold value of slowing down, then:
According to described current virtual accelerator open degree and current vehicle speed, determine that deceleration downshift type exports Automatic Transmission control unit to, perform corresponding clutch control and shift control to make described Automatic Transmission control unit according to described deceleration downshift type;
Described Automatic Transmission control unit exports the deceleration torque request of corresponding described deceleration downshift type to engine controller, to make engine controller according to all torque demand determination current demand moments of torsion comprising described current cruise target moment of torsion and described deceleration torque request received, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
4. the cruise control method according to claim 1,2 or 3, is characterized in that, described according to described current cruise target speed, calculates current cruise target moment of torsion and comprises:
Calculate the difference between described current cruise target speed and current cruising speed, obtain current cruising speed variable quantity;
Obtain the current overall gear ratio of automotive transmission;
According to the data reflecting corresponding relation between the current overall gear ratio of automotive transmission and PID adjustment factor, obtain the PID adjustment factor of corresponding described current overall gear ratio as current PID adjustment factor;
According to described previous cycle velocity variable and described current PID adjustment factor, calculate current cruise target moment of torsion.
5. the cruise control method according to claim 1,2 or 3, it is characterized in that, described according to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, the virtual throttle aperture obtaining corresponding described current cruise target moment of torsion and present engine rotating speed comprises as current virtual accelerator open degree:
According to reflection cruise target moment of torsion and the data of corresponding relation between engine speed and virtual throttle aperture, obtain the virtual throttle aperture of corresponding described current cruise target moment of torsion and present engine rotating speed as current virtual accelerator open degree by interpolation.
6. cruise control method according to claim 5, is characterized in that, described current virtual accelerator open degree is less than the virtual throttle aperture when urgency acceleration downshift request of described Automatic Transmission control unit and anxious deceleration downshift request, then:
Show the output torque of present engine can maintain current shift under vehicle operating, now described Automatic Transmission control unit stops getting involved the control to described current cruising speed.
7. a CCS cruise control system, is characterized in that, comprising:
Control torque demand of cruising computing module, this module is for receiving the current cruise target speed of engine rotational speed signal and chaufeur input, current cruise target moment of torsion is converted into by transfer function, according to described current cruise target moment of torsion in conjunction with described engine rotational speed signal, utilize linear interpolation formula y=y0+ α (y1-y0) to calculate current virtual accelerator opening amount signal, and export described current virtual accelerator opening amount signal to Automatic Transmission control unit;
Transmission Control Module, this module is for receiving current cruise target speed signal and current virtual accelerator opening amount signal, and the described current cruise target speed signal obtained by Automatic Transmission control unit and described current virtual accelerator opening amount signal perform corresponding clutch control and shift control
System torque Coordination module, this module accelerates torque request or anxious deceleration torque request and described current cruise target moment of torsion for the urgency receiving described Automatic Transmission control unit and export to engine controller, to make engine controller comprise the described anxious all torque demand determination current demand moments of torsion accelerating torque request or described anxious deceleration torque request and described current cruise target moment of torsion according to what receive, and realize described current demand moment of torsion by control engine ignition angle and throttle opening.
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