CN110654385A - Vehicle cruise control method and system - Google Patents

Vehicle cruise control method and system Download PDF

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Publication number
CN110654385A
CN110654385A CN201810714307.6A CN201810714307A CN110654385A CN 110654385 A CN110654385 A CN 110654385A CN 201810714307 A CN201810714307 A CN 201810714307A CN 110654385 A CN110654385 A CN 110654385A
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CN
China
Prior art keywords
vehicle
speed
road
cruise
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810714307.6A
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Chinese (zh)
Inventor
刘亚威
李元伟
刘积成
姜德军
郑辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhengzhou Yutong Bus Co Ltd
Original Assignee
Zhengzhou Yutong Bus Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhengzhou Yutong Bus Co Ltd filed Critical Zhengzhou Yutong Bus Co Ltd
Priority to CN201810714307.6A priority Critical patent/CN110654385A/en
Publication of CN110654385A publication Critical patent/CN110654385A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W30/00Purposes 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
    • B60W30/14Adaptive cruise control
    • B60W30/143Speed control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W30/00Purposes 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
    • B60W30/14Adaptive cruise control
    • B60W30/143Speed control
    • B60W30/146Speed limiting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2510/00Input parameters relating to a particular sub-units
    • B60W2510/06Combustion engines, Gas turbines
    • B60W2510/0638Engine speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2510/00Input parameters relating to a particular sub-units
    • B60W2510/06Combustion engines, Gas turbines
    • B60W2510/0657Engine torque
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2510/00Input parameters relating to a particular sub-units
    • B60W2510/10Change speed gearings
    • B60W2510/1005Transmission ratio engaged
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/10Longitudinal speed

Abstract

The invention relates to a vehicle cruise control method and system, and belongs to the technical field of vehicle cruise control. The invention detects the road information at the set distance in front of the vehicle when the vehicle enters into the cruising state, and the invention controls the cruising speed of the vehicle to increase in advance when the front road is uphill and controls the cruising speed of the vehicle to decrease when the front road is downhill by predicting the road environment information in front of the vehicle, predicts the front road information in advance and optimizes the vehicle speed control strategy, and adopts an acceleration-sliding mode to realize that the running speed of the vehicle is automatically adjusted in advance according to the road condition when the vehicle climbs and descends, so that the working state of the engine is adjusted to the economic area, thereby realizing the purpose of saving oil.

Description

Vehicle cruise control method and system
Technical Field
The invention relates to a vehicle cruise control method and system, and belongs to the technical field of vehicle cruise control.
Background
With the rapid development of economy and the continuous improvement of the living standard of people, the automobile keeping quantity in China is continuously increased, a large amount of energy is consumed every year, meanwhile, a large amount of atmospheric pollutants are discharged when the automobile runs, and energy conservation and emission reduction become main measures for solving energy restriction and controlling environmental pollution in China. In order to respond to energy conservation and emission reduction, various automobile manufacturers actively research and develop fuel consumption optimization methods.
Because of its special transportation property, especially for passenger transport, tourism use, need to go on the highway for a long time, in order to relieve driver's driving fatigue, the medium and high-end passenger train has basically all configured vehicle cruise system, its effect is: after cruise setting is performed at a speed requested by a driver, the vehicle speed is automatically maintained without stepping on an accelerator pedal, and the vehicle is driven 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, so that the fatigue is relieved, unnecessary vehicle speed change is reduced, and the fuel is effectively saved. However, the cruise mode can achieve an energy-saving effect in some plain areas with small gradient changes, and often cannot achieve the energy-saving effect in some areas with large gradient fluctuation, and even can cause the problems of fuel waste, poor subjective feeling of drivers and the like. The reason is that the current constant-speed cruise system cannot fully identify road information, such as ramp information, speed limit information and the like, cannot timely perform oil-saving control and speed control on the vehicle according to the road information, and has a large practical use defect.
Chinese patent with publication number CN104385919A entitled "automobile constant speed cruise system and constant speed cruise method" discloses an automobile constant speed cruise system and constant speed cruise method, which comprises a first microprocessor module I connected with an engine ECU unit, wherein the first microprocessor module I is connected with a cruise switch, the engine ECU unit is connected with a second microprocessor module II through a CAN bus, and the second microprocessor module II is respectively and correspondingly connected with a speed sensor, an indicator light and an instrument; wherein: the first micro-processing module I receives and converts an operation signal of the cruise switch and transmits the operation signal to the engine ECU unit; the second micro-processing module II receives a vehicle speed signal sensed by the speed sensor in real time, converts the vehicle speed signal into a CAN signal, sends the CAN signal to the engine ECU unit through a CAN bus, and simultaneously receives and analyzes a real-time cruising working state and fault information sent by the engine ECU unit to the indicator lamp and the instrument; the engine ECU unit receives the control signal, the clutch signal, the brake signal and the exhaust brake signal of the first micro-processing module I, analyzes the signals, controls the vehicle speed according to the control requirement under the condition of meeting the preset constant-speed cruise condition, and simultaneously sends the real-time cruise working state and the fault information to the second micro-processing module II through the CAN bus. The disadvantages are as follows: firstly, the actual road condition of the vehicle is not considered in the constant-speed cruise setting, the cruise speed is reduced when the vehicle goes up a slope, the fuel economy and the driving comfort are not facilitated, and the defect of large actual use is overcome; and secondly, the functions of vehicle positioning and road gradient judgment are not provided.
Chinese patent publication No. CN105346390A entitled "a cruise control system and cruise control method based on vehicle navigation system" discloses a cruise control system and method, the system including: the system comprises a main audio unit, an engine control unit, an ABS controller, a constant-speed cruise switch and a constant-speed cruise setting switch. The automobile speed control system comprises an ABS 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 a main audio unit, the main audio unit comprises a navigator and a gyroscope, the position of a road section where a vehicle is located can be accurately located, speed limit information, gradient information and navigation information of the road section where the vehicle is located can be provided, the main audio unit is connected to an engine control unit, the engine control unit receives information (including set cruise speed, automobile speed information detected by the ABS controller and navigation positioning information) collected by the main audio unit, and the automobile speed is stably maintained in a cruise speed range according to a set cruise. The disadvantages are as follows: firstly, the condition of a road ahead cannot be predicted in advance to carry out active control, and the cruising speed is passively maintained, so that the energy-saving effect is limited; secondly, cruise speed control is only carried out on the preset value of the slope of a single road, and control is relatively extensive.
Disclosure of Invention
The invention aims to provide a vehicle cruise control method, which aims to solve the problem that the energy-saving effect is poor because the active cruise control can not be carried out on a road ahead in advance in the conventional vehicle cruise control; the invention also provides a vehicle cruise control system.
The present invention provides a vehicle cruise control method for solving the above-mentioned problems, the control method including the steps of:
1) when the vehicle enters a cruising state, detecting road information at a set distance in front of the vehicle, wherein the road information comprises ramp information;
2) when the road at the set distance in front of the vehicle is detected to be an uphill road section, determining a first speed set value according to the cruising speed, the gradient and the slope length of the vehicle, and accelerating the cruising speed of the vehicle to the first speed set value;
3) and when the road at the set distance in front of the vehicle is detected to be a downhill section, determining a second speed set value according to the cruising speed, the gradient and the slope length of the vehicle, and reducing the current cruising speed of the vehicle to the second speed set value.
According to the method, by predicting the road environment information in front of the vehicle, when the road on the front side is an uphill, the cruising speed of the vehicle is controlled to increase in advance, when the road on the front side is a downhill, the cruising speed of the vehicle is controlled to decrease, the road information in front is predicted in advance, the vehicle speed control strategy is optimized, and the driving speed of the vehicle is automatically adjusted in advance according to the road condition when the vehicle climbs and descends.
Further, in order to avoid that the vehicle speed exceeds the highest speed limit when the vehicle is on an uphill and the safe operation of the vehicle is influenced, when the first speed set value is larger than the current road section highest speed limit speed value, the current road section highest speed limit speed value is used as the first speed set value.
Furthermore, the invention also provides a process for determining the speed value, wherein the first speed set value and the second speed set value are obtained by dividing the cruising speed range, the gradient range and the gradient length range into corresponding number of sub-ranges and calibrating through experiments.
In order to avoid the problem that the driving safety is influenced by the cruise control of the vehicle on a congested road section, the safety and the fuel saving performance of the vehicle are further improved, when congestion occurs in the front of the vehicle or the distance between the vehicle and the vehicle in front is less than a set length, the vehicle is controlled to brake, and when the congestion in the front is relieved or the distance between the vehicle and the vehicle in front is greater than or equal to the set length, the vehicle is controlled to recover the current economical cruise speed.
In order to realize that the vehicle completely passes through the downhill section by sliding and further improve the oil saving effect, when the road at the set distance in front of the vehicle is detected to be the downhill section, the engine is controlled to stop oil injection, and the deceleration sliding is carried out in advance.
Further, when it is detected that the road at the set distance ahead of the vehicle is an uphill road section, the engine torque is controlled to be adjusted uniformly and the transmission is shifted.
The invention also provides a vehicle cruise control system, which comprises a vehicle information acquisition module, a road information acquisition module, a cruise vehicle speed calculation module and a controller, wherein the cruise vehicle speed calculation module is connected with the vehicle information acquisition module and the road information acquisition module and is used for determining an economical cruise vehicle speed according to the acquired current cruise vehicle speed of the vehicle and the acquired road information at the set distance in front of the vehicle, when the road at the set distance in front of the vehicle is detected to be an uphill road section, a first speed set value is determined according to the cruise speed, the gradient and the gradient length of the vehicle, when the road at the set distance in front of the vehicle is detected to be a downhill road section, a second speed set value is determined according to the cruise speed, the gradient and the gradient length of the vehicle, and the controller determines the second speed set value according to the cruise vehicle speed calculation module, the cruising speed of the vehicle is controlled to be increased to a first speed set value or decreased to a second speed set value.
Further, when the first speed set value is greater than the current highest speed-limiting speed value of the road section, the current highest speed-limiting speed value of the road section is used as the first speed set value.
Further, when the front of the vehicle is congested or the distance between the vehicle and the front vehicle is less than the set length, the vehicle is controlled to brake, and when the congestion of the front side is relieved or the distance between the vehicle and the front vehicle is greater than or equal to the set length, the vehicle is controlled to recover the current economical cruising speed.
Further, the controller is also in control connection with an engine control unit and a transmission control unit, and is used for sending an instruction for controlling the engine to stop fuel injection to the engine control unit when detecting that a road at a set distance in front of the vehicle is a downhill road section; and the control unit is used for sending a gear box shifting command to the transmission control unit when detecting that the road at the set distance in front of the vehicle is an uphill road section.
Drawings
FIG. 1 is a flow chart of a vehicle cruise control method of the present invention;
fig. 2 is a block diagram of the configuration of the cruise control system of the vehicle of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Embodiments of a vehicle cruise control method of the present invention
According to the method, the condition of a road ahead is predicted, and when the road ahead is an uphill road section, the engine is controlled to output higher rotating speed and torque in advance or the transmission is shifted in advance, so that the vehicle is accelerated to a certain value, and then the vehicle slides to rush over the top of a slope; when the front is predicted to be the downhill section, controlling the engine to stop oil injection in advance, and safely passing through the downhill section by using vehicle sliding; the predictive cruise control method can adjust the working state of the engine to an economic region, thereby achieving the purpose of saving oil. The method can be used for vehicles such as passenger cars and saloon cars, and the following description takes the application in the passenger cars as an example, the specific implementation process of the method is shown in fig. 1, and the specific implementation steps are as follows.
1. Vehicle information and road information at a set distance ahead are collected.
The collection of the vehicle information and the road information is performed when the vehicle enters the cruise state by the cruise switch or the cruise setting switch. The road information at the set distance in front of the vehicle is acquired in real time through a high-precision map based on a network terminal and comprises road grade, road speed limit and information of the road environment in front, wherein the road environment information mainly comprises ramp information, road congestion information and the like, the ramp information comprises a position point, a gradient, ramp length and the like, and the road congestion information comprises a congestion position, a congestion length and the like. The set distance in front of the vehicle defined by the invention is not a fixed distance value, and can be set according to the model and the performance of the vehicle. The collected vehicle information mainly refers to the cruising speed of the vehicle, and can also collect rotating speed information, torque information, gear information and the like according to needs.
2. And determining the economical cruising speed of the vehicle according to the road information at the front set distance and the current cruising speed.
When an uphill road section is detected at the set distance ahead, judging the ramp state according to the ramp information of the uphill road section ahead, and determining the economical cruise speed (a first speed set value) according to the judged ramp state. The first speed set value is obtained by dividing a cruising speed range, a gradient range and a slope length range into corresponding number of sub-ranges and calibrating through experiments. Specifically, the corresponding relation between the ramp state and the cruise vehicle speed increment is established under the corresponding cruise vehicle speed.
Cruise speed V set in general0In the range of (30, V)max]Specifically, the cruising speed (30, V)max]Divided into several speed ranges of (30, V)0]、(V0,V1]、(V1,V2]、(V2,V3]……、(Vn,Vmax]The larger n is, the more cruising vehicle speed ranges are divided, and accordingly, the length of each range is shorter and the control is finer. Since the data is more, the data is not repeated, and the cruising speed is simply (30, V)0]The range is taken as an example, and the corresponding relationship between the hill state and the cruising vehicle speed increase is shown in table 1: in particular the ramp length (0, L)n]Divided into a plurality of slope length ranges of (0, L)0]、(L0,L1]、(L1,L2]、(L2,L3]……、(Lm-1,Lm]Wherein 0 represents a no slope state, LmRepresents the maximum slope length, L0、L1、……、LmThe slope lengths are different and set, and two adjacent set slope lengths form a slope length range; will slope (0, i)n]Divided into a plurality of gradient ranges of (0, i)0]、(i0,i1]、(i1,i2]、(i2,i3]……、(in-1,in]. Wherein 0 represents a no slope state, inRepresents the maximum gradient, i0、i1、……、inThe slope is set to be different, and two adjacent set slopes form a slope range; the number of the divided ranges, i.e., the number of m and n, can be set according to actual conditions, when n is small, i.e., the number of the divided ranges is small, the length of each number range is long, the control is rough, when n is large, i.e., the number of the divided ranges is large, the length of each number range is correspondingly short, and the control is fine. In principle, the minimum value of n is 2, and for a certain fineness of control, the minimum value of n is typically 4, 5, 6 or 7, although n may be a larger number if a finer control is desired. And looking up a table based on the current cruising speed and the road information to determine the economical cruising speed of the current uphill road section, namely the first speed set value.
TABLE 1
When a downhill section ahead is detected, the economical cruise speed (a second speed set value) is determined according to the information (the position point, the gradient and the ramp length) of the downhill section ahead after being processed and the judged ramp state. The method for determining the downhill economical cruise speed is basically consistent with that of an uphill, and when a downhill section exists in front of the vehicle, the downhill economical cruise speed is determined according to the length and the gradient of the downhill section. The second speed set value is obtained by dividing the cruising speed range, the gradient range and the gradient length range into corresponding number of sub-ranges through experimental calibration, and is the same as the determination process of the first speed set value, and the details are not repeated.
3. And performing cruise control on the vehicle according to the determined economical cruise vehicle speed of the vehicle.
If the detected front road section has an uphill road section, controlling the torque of the engine in advance to carry out uniform adjustment and advance gear shifting of the gearbox according to a formulated cruise energy-saving control strategy until the vehicle speed is increased to a first speed set value; if the manual transmission is used for shifting the vehicle, the control of the gearbox can be realized through the advance voice prompt.
In the process of controlling the increase of the cruising speed, whether the first speed set value is larger than the highest speed limit value or not needs to be judged, if so, the first speed set value needs to be updated to the highest speed limit value in order to avoid the problem that the cruising speed exceeds the highest speed limit value to cause the vehicle to be in a dangerous driving state, namely, the cruising speed of the vehicle is controlled to be the highest speed limit value at the moment.
If a downhill section is detected in front, each downhill information (slope length and slope) corresponds to a deceleration value according to a formulated cruise energy-saving control strategy, then the vehicle is controlled to perform deceleration sliding in advance at a proper time, the engine is controlled to stop oil injection in advance, the cruise speed of the vehicle is reduced to a second speed set value, and the vehicle safely passes through the downhill section by means of sliding, so that unnecessary braking during downhill is avoided, and fuel waste is caused.
The above 2 conditions are all energy-saving cruise control on the vehicle under the condition of ensuring the driving safety, if the conditions of congestion in the front, close following and the like occur, the vehicle is controlled to brake, and when the congestion in the front is relieved or the distance between the front and the vehicle is greater than or equal to the set length, the vehicle is controlled to recover the current economic cruise speed. The driver can also control the cruise release by pressing the cruise switch, stepping on the clutch, stepping on the brake and the like.
Embodiments of a vehicle cruise control System according to the invention
The cruise control system comprises a vehicle information acquisition module, a road information acquisition module, a cruise vehicle speed calculation module and a controller, wherein the cruise vehicle speed calculation module in complaint initiation is connected with the vehicle information acquisition module and the road information acquisition module, for determining the economical cruising speed according to the obtained cruising speed of the current vehicle and the road information at the set distance in front of the vehicle, when the road at the set distance in front of the vehicle is detected to be an uphill road section, the first speed set value is determined according to the cruising speed, the gradient and the slope length of the vehicle, when the road at the set distance in front of the vehicle is detected to be a downhill section, and the controller controls the cruising speed of the vehicle to be increased to the first speed set value or decreased to the second speed set value according to the first speed set value and the second speed set value determined by the cruising speed calculation module.
Specifically, as shown in fig. 2, the controller is a vehicle controller, the vehicle controller is connected with a cruise vehicle speed calculation module through a CAN bus, the cruise vehicle speed calculation module is connected with a vehicle information acquisition module and a road information acquisition module through the CAN bus, the vehicle information acquisition module CAN be realized by using an information acquisition module of a vehicle belt and is used for acquiring vehicle speed information, gear information, torque information and the like of the vehicle, and the road information acquisition module acquires front road information in real time through a high-precision map based on a network connection terminal. The whole vehicle controller performs cruise control on the vehicle according to a first speed set value or a second speed set value determined by the cruise vehicle speed calculation module, and when a road at a set distance in front of the vehicle is detected to be a downhill road section, the whole vehicle controller sends an instruction for controlling the engine to stop fuel injection to the engine control unit, so that the cruise vehicle speed is reduced to the second speed set value, and the vehicle safely passes through the downhill road section by means of vehicle sliding; when the road at the set distance in front of the vehicle is detected to be an uphill road section, the vehicle control unit sends a gear shifting command of the gearbox to the transmission control unit, and controls the torque of the engine to be uniformly adjusted and the gearbox to be shifted in advance until the speed of the cruise vehicle is increased to a first speed set value. The specific control process is the same as that of the method and will not be described in detail here.

Claims (10)

1. A cruise control method for a vehicle, characterized by comprising the steps of:
1) when the vehicle enters a cruising state, detecting road information at a set distance in front of the vehicle, wherein the road information comprises ramp information;
2) when the road at the set distance in front of the vehicle is detected to be an uphill road section, determining a first speed set value according to the cruising speed, the gradient and the slope length of the vehicle, and accelerating the cruising speed of the vehicle to the first speed set value;
3) and when the road at the set distance in front of the vehicle is detected to be a downhill section, determining a second speed set value according to the cruising speed, the gradient and the slope length of the vehicle, and reducing the current cruising speed of the vehicle to the second speed set value.
2. The vehicle cruise control method according to claim 1, characterized in that when the first speed set value is greater than the current road section highest speed limit value, the current road section highest speed limit value is taken as the first speed set value.
3. A vehicle cruise control method according to claim 2, characterised in that the first and second speed settings are obtained by experimental calibration, dividing the cruise speed range, the range of slopes and the range of slope lengths into a corresponding number of sub-ranges.
4. The vehicle cruise control method according to claim 1 or 2, characterized in that the vehicle is controlled to brake when congestion occurs in front of the vehicle or the distance to the vehicle ahead is less than a set length, and the vehicle is controlled to return to the current cruise vehicle speed when the congestion on the front is relieved or the distance to the vehicle ahead is greater than or equal to the set length.
5. The vehicle cruise control method according to claim 1, wherein when it is detected that the road at the set distance ahead of the vehicle is a downhill section, the engine is controlled to stop fuel injection and to perform deceleration coasting in advance.
6. A vehicle cruise control method according to claim 1, characterized in that the engine torque is controlled for even adjustment and gearbox shifting when an uphill section of the road at a set distance ahead of the vehicle is detected.
7. A vehicle cruise control system is characterized by comprising a vehicle information acquisition module, a road information acquisition module, a cruise vehicle speed calculation module and a controller, wherein the cruise vehicle speed calculation module is connected with the vehicle information acquisition module and the road information acquisition module and is used for determining an economical cruise vehicle speed according to the acquired current cruise vehicle speed of a vehicle and road information at a set distance in front of the vehicle, determining a first speed set value according to the cruise speed, the gradient and the slope length of the vehicle when detecting that a road at the set distance in front of the vehicle is an uphill road section, determining a second speed set value according to the cruise speed, the gradient and the slope length of the vehicle when detecting that the road at the set distance in front of the vehicle is a downhill road section, and determining the second speed set value according to the cruise speed, the second speed set value and the slope length of the vehicle by the cruise vehicle speed calculation module, the cruising speed of the vehicle is controlled to be increased to a first speed set value or decreased to a second speed set value.
8. The vehicle cruise control system according to claim 7, wherein when the first speed set point is greater than the current road section highest speed limit value, then the current road section highest speed limit value is taken as the first speed set point.
9. The vehicle cruise control system according to claim 7 or 8, wherein the vehicle is controlled to brake when a congestion occurs in front of the vehicle or the distance to the vehicle ahead is less than a set length, and the vehicle is controlled to return to the current economical cruise vehicle speed when the congestion is relieved at the front or the distance to the vehicle ahead is greater than or equal to the set length.
10. The vehicle cruise control system according to claim 7, wherein the controller further controls an engine control unit and a transmission control unit to be connected, the controller being configured to send an instruction to the engine control unit to stop fuel injection of the engine when a downhill section is detected on a road at a set distance ahead of the vehicle; and the control unit is used for sending a gear box shifting command to the transmission control unit when detecting that the road at the set distance in front of the vehicle is an uphill road section.
CN201810714307.6A 2018-06-29 2018-06-29 Vehicle cruise control method and system Pending CN110654385A (en)

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Application Number Priority Date Filing Date Title
CN201810714307.6A CN110654385A (en) 2018-06-29 2018-06-29 Vehicle cruise control method and system

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CN110654385A true CN110654385A (en) 2020-01-07

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CN105416288A (en) * 2015-12-03 2016-03-23 成都九十度工业产品设计有限公司 Constant speed cruise control system based on cellphone and control method of constant speed cruise control system
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
JP2017085723A (en) * 2015-10-26 2017-05-18 ダイムラー・アクチェンゲゼルシャフトDaimler AG Electric car control device
CN108068806A (en) * 2016-11-11 2018-05-25 郑州宇通客车股份有限公司 A kind of automobile engine cruise energy-saving control method and device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150306957A1 (en) * 2014-04-24 2015-10-29 Cummins Inc. Systems and methods for vehicle speed management
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
JP2017085723A (en) * 2015-10-26 2017-05-18 ダイムラー・アクチェンゲゼルシャフトDaimler AG Electric car control device
CN105416288A (en) * 2015-12-03 2016-03-23 成都九十度工业产品设计有限公司 Constant speed cruise control system based on cellphone and control method of constant speed cruise control system
CN108068806A (en) * 2016-11-11 2018-05-25 郑州宇通客车股份有限公司 A kind of automobile engine cruise energy-saving control method and device

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