CN108068806B - Cruise energy-saving control method and device for automobile engine - Google Patents
Cruise energy-saving control method and device for automobile engine Download PDFInfo
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- CN108068806B CN108068806B CN201611040137.5A CN201611040137A CN108068806B CN 108068806 B CN108068806 B CN 108068806B CN 201611040137 A CN201611040137 A CN 201611040137A CN 108068806 B CN108068806 B CN 108068806B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000001174 ascending effect Effects 0.000 claims abstract description 44
- 230000003044 adaptive effect Effects 0.000 claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 description 8
- 238000013500 data storage Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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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
- B60W30/14—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
- B60W2552/00—Input parameters relating to infrastructure
-
- 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
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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
- B60W2710/0605—Throttle 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
- 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)
- Controls For Constant Speed Travelling (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
The invention provides an energy-saving control method and a device for cruising of an automobile engine, the method comprises the steps of firstly detecting whether a front road is on an uphill slope or a downhill slope, simultaneously obtaining the gradient and the slope length of the uphill slope or the downhill slope according to map information, and increasing the opening of a throttle valve to accelerate to the speed adapting to the gradient and the slope length before the uphill slope if the front road is on the uphill slope; if the front road has a downhill slope, reducing the opening of the throttle valve in advance before the downhill slope to a speed suitable for the slope and the slope length; the adaptive speed comprises a speed adaptive to a short/long gentle ascending slope and a speed adaptive to a short/long steep ascending slope; the speed suitable for the short/long slow downhill and the speed suitable for the short/long slow downhill are also included. By the method provided by the invention, the opening of the throttle valve is controlled to be increased in advance, so that the speed of the vehicle is increased; the throttle valve is controlled to be closed in advance, so that the speed of the vehicle is reduced, and the purpose of saving oil on the road conditions of going up and down during constant-speed cruising is achieved.
Description
Technical Field
The invention belongs to the field of automobile control, and particularly relates to a cruise energy-saving control method and device for an automobile engine.
Background
CRUISE CONTROL SYSTEM (CCS), also known as CRUISE CONTROL, speed CONTROL, automatic driving SYSTEM, etc., is known by the acronym CCS. The function is as follows: after the switch is closed according to the speed required by the driver, the vehicle speed is automatically kept without stepping on an accelerator pedal, so that the vehicle runs at a fixed speed. By adopting the device, after the vehicle runs on the highway for a long time, a driver does not need to control the accelerator pedal any more, thereby reducing fatigue, reducing unnecessary vehicle speed change and saving fuel.
At present passenger train constant speed cruise has been standardized, and in the use, to the highway condition, constant speed cruise's use has certain help to economizing on fuel, and its throttle control is more accurate, but uses constant speed cruise to the more highway section of going up and down slope ratio, and constant speed cruise is in order to keep setting for the speed of a motor vehicle, refuels and action such as downshift can be more, can lead to the oil drain on the contrary.
In the cruise control system in the market at present, various sensors are used for reading information such as wheel speed, engine rotating speed, engine load, throttle opening and the like of a vehicle, then the information is compared with a set speed for calculation, and finally control elements such as the throttle opening, a gear of a gearbox and the like are adjusted to adjust the vehicle speed, so that cruise control at a constant speed is realized.
The constant-speed cruise system continuously compares the actual speed of the vehicle with the set cruise speed to adjust in order to maintain the set cruise speed, the opening of a throttle valve is continuously increased to maintain the set cruise speed when the vehicle runs on an uphill road, and the set cruise speed is maintained by a brake system when the vehicle runs on a downhill road, so that the control strategy is unfavorable for the fuel saving of the vehicle.
In view of this problem, there are some solutions, such as patent document CN 105346390 a, which is entitled "a constant speed cruise system and a constant speed cruise method based on a car navigation system", and a comparison document discloses a constant speed cruise system and a constant speed cruise method based on a car navigation system, the constant speed cruise system comprising: the automobile speed monitoring system comprises a main audio unit, an engine control unit, an ABS (anti-lock brake system) controller, a constant-speed cruise switch and a constant-speed cruise setting switch, wherein the ABS controller, the constant-speed cruise switch and the constant-speed cruise setting switch are connected to the main audio unit, the main audio unit is connected to the engine control unit, the main audio unit has a navigation positioning function, and the engine control unit stably maintains the automobile speed within a cruise speed range according to the set cruise speed, detected automobile speed information and navigation positioning information. Although the invention fully considers the gradient information of the road section in the vehicle speed maintenance and adds a control method for the vehicle to go up and down the slope based on the navigation positioning information, the invention only controls the speed of the engine to be increased aiming at the vehicle ascending stage and does not solve the problem that the constant speed cruise system wastes oil when going up and down the slope, on the contrary, in order to achieve the set cruise vehicle speed, the opening of the throttle valve is continuously increased, the rotating speed of the engine is continuously increased, and the fuel consumption is inevitably increased; meanwhile, in the downhill stage, the cruise speed is set through the braking system, the inertia energy of the downhill vehicle is not fully exerted, and the fuel consumption is inevitably increased.
Disclosure of Invention
The invention aims to provide a cruise energy-saving control method and a cruise energy-saving control device for an automobile engine, which are used for solving the problem of high fuel consumption of a cruise control system of a vehicle speed when the vehicle speed is on an uphill slope or a downhill slope.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an energy-saving cruise control method for an automobile engine comprises the following steps:
1) detecting whether a front road exists on an uphill slope or a downhill slope;
2) if the front road is on the uphill slope, accelerating before the uphill slope; if there is a downhill slope on the road ahead, the vehicle decelerates before going downhill.
And in the second method scheme, on the basis of the first method scheme, the current position of the vehicle is positioned through a GPS, and whether the front road is on an uphill slope or a downhill slope is detected by combining map information.
And in the third method scheme, on the basis of the second method scheme, the gradient and the length of the upslope or the downslope are obtained according to the map information.
And a fourth method scheme is that on the basis of the first method scheme, the acceleration before the uphill slope or the deceleration before the downhill slope refers to the acceleration to the speed suitable for the gradient and the slope length before the uphill slope or the deceleration to the speed suitable for the gradient and the slope length before the downhill slope.
On the basis of the fourth method scheme, determining that the ascending/descending slope is a slow ascending/descending slope and a steep ascending/descending slope according to the gradient, wherein the adaptive speed comprises a speed adaptive to the slow ascending slope, a speed adaptive to the steep ascending slope, a speed adaptive to the slow descending slope and a speed adaptive to the steep descending slope; the speed suitable for the slow ascending slope further comprises a speed suitable for the short slow ascending slope and a speed suitable for the long slow ascending slope; the speed suitable for the steep ascending slope also comprises a speed suitable for the short steep ascending slope and a speed suitable for the long steep ascending slope; the speed suitable for the slow descending slope further comprises a speed suitable for the short slow descending slope and a speed suitable for the long slow descending slope; the speed suitable for the steep downgrade also comprises the speed suitable for the short steep downgrade and the speed suitable for the long steep downgrade.
And on the basis of the method scheme I or the method scheme IV, the acceleration or the deceleration is carried out by adjusting the opening degree of a throttle valve.
The invention also provides a cruise energy-saving control device of the automobile engine, which comprises the following components in a first device scheme:
a detection unit: the system is used for detecting whether a front road is on an uphill slope or a downhill slope;
an acceleration and deceleration unit: accelerating before the uphill if the front road exists on the uphill; if there is a downhill slope on the road ahead, the vehicle decelerates before going downhill.
And the device scheme II is based on the device scheme I, and further comprises a unit for positioning the current position of the vehicle through a GPS and detecting whether the road ahead is on an uphill slope or a downhill slope by combining map information.
And a third device scheme is based on the second device scheme and further comprises a unit for acquiring the gradient and the length of the uphill slope or the downhill slope simultaneously according to the map information.
And on the basis of the first device scheme, the acceleration before the uphill slope or the deceleration before the downhill slope refers to the acceleration before the uphill slope to the speed suitable for the gradient and the slope length or the deceleration before the downhill slope to the speed suitable for the gradient and the slope length.
The invention has the beneficial effects that:
according to the cruise energy-saving control method and the cruise energy-saving control device for the automobile engine, when the condition that the road condition in front is an uphill slope is detected, the speed is increased in advance to achieve the purpose of rushing to the uphill slope, and the increased speed is different according to the difference between the uphill slope and the length of the uphill slope; when the front road condition is detected to be downhill, the speed of the vehicle is reduced in advance, and the vehicle is in a sliding stage with gears in the downhill stage, and the reduced speed of the vehicle is different according to the difference of the downhill gradient and the slope length. The purpose of saving oil under the conditions of constant-speed cruising and uphill and downhill can be achieved by a control method of increasing or closing a throttle valve in advance to increase or reduce the vehicle speed.
Drawings
FIG. 1 is a block diagram of a GPS-based cruise energy-saving control system of an automobile engine;
FIG. 2 is a schematic diagram of slope range division;
FIG. 3 is a flow chart of vehicle speed control on an uphill grade;
fig. 4 is a flowchart of vehicle speed control at downhill.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
the embodiment of the cruise energy-saving control method of the automobile engine comprises the following steps:
the control method combines the gradient and the slope length of a road to control the cruising speed, firstly divides the gradient range, and concretely, as shown in figure 2, the cruising energy-saving control method of the automobile engine has the following specific control processes:
the uphill vehicle speed control process, as shown in fig. 3, specifically includes the following steps:
①, firstly, judging whether the front A meter gradient is more than or equal to B% and less than C%, if so, executing step ②, and if the front A meter gradient is more than C%, executing step ⑤;
②, judging whether the front A meter slope length is less than or equal to F meters, if yes, executing step ③, and if not, executing step ④;
③ keeping the current set cruising speed unchanged, the vehicle continues to run;
④ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Hkm/h;
⑤, judging whether the front A meter slope length is less than or equal to F meters, if so, executing ⑥, otherwise executing ⑦;
⑥ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Lkm/h;
⑦ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Pkm/h;
as shown in fig. 4, the process for controlling the downhill speed specifically includes the following steps:
①, firstly, judging whether the front G meter gradient is more than or equal to-E% and less than-D%, if so, executing step ②, and if the front G meter gradient is less than-E%, executing step ⑤;
②, judging whether the slope length of G meters ahead is less than or equal to K meters, if so, executing step ③, and if not, executing step ④;
③ keeping the current set cruising speed unchanged, the vehicle continues to run;
④, the opening of the vehicle throttle valve is reduced, and the vehicle speed is uniformly reduced to Rkm/h;
⑤, judging whether the slope length of G meters ahead is less than or equal to K meters, if so, executing ⑥, otherwise executing ⑦;
⑥ the opening of the vehicle throttle valve is reduced, the vehicle speed is evenly decelerated to Skm/h;
⑦ the opening degree of the vehicle throttle valve is reduced, the vehicle speed is evenly decelerated to Tkm/h;
and when the gradient is larger than or equal to-D% and smaller than B%, entering a level road section, and keeping the cruising speed unchanged.
The parameters such as A meter, G meter, F meter, K meter, gradient value B%, gradient value C%, gradient value-D%, gradient value-E%, vehicle speed Hkm/h, vehicle speed Lkm/h, vehicle speed Pkm/h, vehicle speed Rkm/h, vehicle speed Skm/h and vehicle speed Tkm/h can be calibrated through a vehicle control module according to different vehicle types and different power configurations.
In the above embodiment, Hkm/h is the speed at a long and gentle ascending, Lkm/h is the speed at a short and steep ascending, Pkm/h is the speed at a long and steep ascending, Rkm/h is the speed at a short and gentle descending, Skm/h is the speed at a short and steep descending, and Tkm/h is the speed at a long and steep descending.
In the above described embodiments, the adapted speed is designed for the respective uphill/downhill slope, taking into account the length and the gradient of the slope. In another embodiment, only the slope or the length of the slope may be considered, and the overall process from the start of acceleration/deceleration to the ascending/descending may be made to exhibit the fuel saving effect by considering the slope length and/or the slope.
The invention also provides a cruise energy-saving control device of the automobile engine, which comprises a detection unit and an acceleration and deceleration unit, wherein the detection unit is realized by a road condition judgment module, the acceleration and deceleration unit is realized by an uphill control module and a downhill control module, and the road condition judgment module acquires the information of the position, the gradient and the length of the road from a GPS module and a map data storage module; the road condition judging module judges whether the road ahead is on an uphill slope or a downhill slope, and the road condition judging module further comprises a level road control module, which is specifically shown in fig. 1.
The control device is characterized in that a GPS module is used for positioning the current position of a vehicle, a map data storage module is used for storing road information of the position, the gradient and the slope length of the vehicle, which is traveled by the vehicle, so as to conveniently and quickly obtain road information and road conditions in front of the road of the vehicle, a judgment module is used for comparing the real-time position information of the vehicle with the road position information of the map data storage module to obtain the specific road information in front of the vehicle, the road information comprises the position, the gradient and the slope length, and the like, so that the front road is judged to be a flat road, an ascending road or a descending road, and then the judgment result of the road conditions is transmitted to an influencing control module, such as a flat road control module, an ascending road control module and a descending road control module, the three modules are used for controlling the cruising speed according to a preset vehicle speed control strategy, including controlling, the vehicle control execution module is used for executing actions according to the information sent by the road condition control module, automatically adjusting engine parameters, such as adjusting fuel injection quantity, and further controlling the cruising speed.
As other embodiments, even if neither the length of the slope nor the gradient is considered, the control can accelerate/decelerate to a fixed speed no matter what kind of slope, so that the fuel-saving effect can be at least ensured in the process of ascending/descending.
In addition, if more accurate control is desired, a two-dimensional table can be designed according to different gradients and slope lengths, and the speed of each gradient and slope length is different.
Claims (7)
1. An automobile engine cruise energy-saving control method is characterized by comprising the following steps:
1) detecting whether a front road exists on an uphill slope or a downhill slope;
2) if the front road is on the uphill slope, accelerating before the uphill slope; if the front road has a downhill slope, decelerating before the downhill slope;
the acceleration before the uphill slope or the deceleration before the downhill slope refers to the acceleration before the uphill slope to the speed which is suitable for the slope and the slope length or the deceleration before the downhill slope to the speed which is suitable for the slope and the slope length;
determining the ascending/descending slope to be a slow ascending/descending slope and a steep ascending/descending slope according to the slope, wherein the adaptive speed comprises a speed adaptive to the slow ascending slope, a speed adaptive to the steep ascending slope, a speed adaptive to the slow descending slope and a speed adaptive to the steep descending slope; the speed suitable for the slow ascending slope further comprises a speed suitable for the short slow ascending slope and a speed suitable for the long slow ascending slope; the speed suitable for the steep ascending slope also comprises a speed suitable for the short steep ascending slope and a speed suitable for the long steep ascending slope; the speed suitable for the slow descending slope further comprises a speed suitable for the short slow descending slope and a speed suitable for the long slow descending slope; the speed suitable for the steep downgrade also comprises the speed suitable for a short steep downgrade and the speed suitable for a long steep downgrade;
the control process of the uphill vehicle speed specifically comprises the following steps:
①, firstly, judging whether the front A meter gradient is more than or equal to B% and less than C%, if so, executing step ②, and if the front A meter gradient is more than C%, executing step ⑤;
②, judging whether the front A meter slope length is less than or equal to F meters, if yes, executing step ③, and if not, executing step ④;
③ keeping the current set cruising speed unchanged, the vehicle continues to run;
④ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Hkm/h;
⑤, judging whether the front A meter slope length is less than or equal to F meters, if so, executing ⑥, otherwise executing ⑦;
⑥ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Lkm/h;
⑦ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Pkm/h;
wherein, A meter, B percent of slope value, C percent of slope value, F meter, Hkm/h, Lkm/h and Pkm/h are set values corresponding to different vehicle types and different power configurations and are calibrated through a vehicle control module.
2. The automobile engine cruise energy-saving control method according to claim 1, characterized in that the current position of the vehicle is located by GPS, and whether the road ahead is on the uphill or downhill is detected by combining map information.
3. The cruise energy-saving control method of an automobile engine according to claim 2, characterized in that the gradient and the length of the uphill or downhill are also obtained according to map information.
4. The automobile engine cruise energy-saving control method according to claim 1, characterized in that acceleration or deceleration is performed by adjusting throttle opening.
5. An automobile engine cruise energy-saving control device is characterized by comprising:
a detection unit: the system is used for detecting whether a front road is on an uphill slope or a downhill slope;
an acceleration and deceleration unit: accelerating before the uphill if the front road exists on the uphill; if the front road has a downhill slope, decelerating before the downhill slope;
the acceleration before the uphill slope or the deceleration before the downhill slope refers to the acceleration before the uphill slope to the speed which is suitable for the slope and the slope length or the deceleration before the downhill slope to the speed which is suitable for the slope and the slope length;
determining the ascending/descending slope to be a slow ascending/descending slope and a steep ascending/descending slope according to the slope, wherein the adaptive speed comprises a speed adaptive to the slow ascending slope, a speed adaptive to the steep ascending slope, a speed adaptive to the slow descending slope and a speed adaptive to the steep descending slope; the speed suitable for the slow ascending slope further comprises a speed suitable for the short slow ascending slope and a speed suitable for the long slow ascending slope; the speed suitable for the steep ascending slope also comprises a speed suitable for the short steep ascending slope and a speed suitable for the long steep ascending slope; the speed suitable for the slow descending slope further comprises a speed suitable for the short slow descending slope and a speed suitable for the long slow descending slope; the speed suitable for the steep downgrade also comprises the speed suitable for a short steep downgrade and the speed suitable for a long steep downgrade;
the control process of the uphill vehicle speed specifically comprises the following steps:
①, firstly, judging whether the front A meter gradient is more than or equal to B% and less than C%, if so, executing step ②, and if the front A meter gradient is more than C%, executing step ⑤;
②, judging whether the front A meter slope length is less than or equal to F meters, if yes, executing step ③, and if not, executing step ④;
③ keeping the current set cruising speed unchanged, the vehicle continues to run;
④ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Hkm/h;
⑤, judging whether the front A meter slope length is less than or equal to F meters, if so, executing ⑥, otherwise executing ⑦;
⑥ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Lkm/h;
⑦ the opening degree of the vehicle throttle valve is increased, the vehicle speed is uniformly increased to Pkm/h;
wherein, A meter, B percent of slope value, C percent of slope value, F meter, Hkm/h, Lkm/h and Pkm/h are set values corresponding to different vehicle types and different power configurations and are calibrated through a vehicle control module.
6. The cruise energy-saving control device for automobile engine according to claim 5, further comprising a unit for locating the current position of the vehicle by GPS and detecting whether the road ahead is on the uphill or downhill in combination with map information.
7. The cruise energy-saving control device according to claim 6, further comprising means for obtaining the gradient and the length of an ascending or descending slope at the same time also based on map information.
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| CN201611040137.5A CN108068806B (en) | 2016-11-11 | 2016-11-11 | Cruise energy-saving control method and device for automobile engine |
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| CN110654385A (en) * | 2018-06-29 | 2020-01-07 | 郑州宇通客车股份有限公司 | Vehicle cruise control method and system |
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| CN110155051B (en) * | 2019-04-30 | 2020-11-13 | 吉林大学青岛汽车研究院 | Fuel-saving control method for truck speed change cruise |
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| CN111559374A (en) * | 2020-04-26 | 2020-08-21 | 东风汽车集团有限公司 | Constant-speed cruise system-based large-slope constant-speed control method |
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| CN112660202B (en) * | 2021-01-04 | 2022-05-10 | 中车青岛四方车辆研究所有限公司 | Train automatic driving system integrated with vehicle depth |
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| CN105691393A (en) * | 2014-11-25 | 2016-06-22 | 广州汽车集团股份有限公司 | Intelligent vehicle cruise control method and device based on real-time road condition |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: 450016 Yutong Industrial Zone, eighteen Li River, Henan, Zhengzhou Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |