CN118220145A - Control method for automatically controlling the coasting of a vehicle and associated control device - Google Patents

Control method for automatically controlling the coasting of a vehicle and associated control device Download PDF

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Publication number
CN118220145A
CN118220145A CN202211631136.3A CN202211631136A CN118220145A CN 118220145 A CN118220145 A CN 118220145A CN 202211631136 A CN202211631136 A CN 202211631136A CN 118220145 A CN118220145 A CN 118220145A
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CN
China
Prior art keywords
vehicle
speed
engine
threshold
coasting
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
CN202211631136.3A
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Chinese (zh)
Inventor
黄书飞
甘泉
顾祥龙
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.)
PSA Automobiles SA
Original Assignee
PSA Automobiles SA
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 PSA Automobiles SA filed Critical PSA Automobiles SA
Priority to CN202211631136.3A priority Critical patent/CN118220145A/en
Publication of CN118220145A publication Critical patent/CN118220145A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18072—Coasting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18072—Coasting
    • B60W2030/18081—With torque flow from driveshaft to engine, i.e. engine being driven by vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18072—Coasting
    • B60W2030/1809—Without torque flow between driveshaft and engine, e.g. with clutch disengaged or transmission in neutral

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Abstract

The present invention relates to a control method for automatically controlling the coasting of a vehicle. The control method comprises the following steps: detecting a deceleration distance of the vehicle while the vehicle is running, and detecting whether a driver releases an accelerator pedal; comparing the detected deceleration distance with a calibrated distance threshold when the accelerator pedal is released; detecting whether a current engine speed of the vehicle is greater than a first speed threshold when the deceleration distance is not greater than the distance threshold, and in the event of yes, shutting off engine fuel supply; and when the deceleration distance is greater than the distance threshold, detecting whether the current speed of the vehicle is between a first speed threshold and a second speed threshold that is less than the first speed threshold, and in the event that it is, causing a transmission clutch to disconnect the engine from the axle to initiate freewheeling. The control method of the invention can intelligently match the optimal sliding mode according to different required sliding distances.

Description

Control method for automatically controlling the coasting of a vehicle and associated control device
Technical Field
The present invention relates generally to the field of vehicle control technology. More particularly, the present invention relates to a control method for automatically controlling the coasting of a vehicle and to an associated control device, and to a vehicle comprising such a control device.
Background
The coasting modes that a vehicle can select while decelerating mainly include two types: a first coasting mode in which fuel is cut off to the engine and a second coasting mode in which freewheeling (freewheeling) is used.
For the first coasting mode, when the driver releases the accelerator pedal during vehicle travel, the fuel supply to the engine is cut off until the engine speed is reduced to the engine idle speed plus an offset value, such as engine idle speed +200 rpm. In this first coasting mode, the transmission clutch does not disconnect the engine from the axle, and at this time, while fuel is saved, the vehicle's inertial energy will be consumed by engine friction losses, which is detrimental to long range coasting.
For the second coasting mode, when the driver releases the accelerator pedal during vehicle travel, the transmission clutch disconnects the engine from the axle to reduce friction losses during coasting, similar to the driver putting the shift lever into neutral to enable the vehicle to coast for a longer distance. In this second coasting mode, the fuel supply to the engine is not cut off, and in this case, although the inertial energy of the vehicle will be utilized as much as possible, the fuel economy of this second coasting mode is relatively poor, especially when coasting at short distances.
In existing vehicle coasting strategies, only one of the two coasting modes described above can be selected. However, each of these two coasting modes has certain drawbacks. In particular, for longer range taxiing, the first taxi mode is not the optimal choice; while for shorter range taxiing the second taxi mode is not the optimal choice.
Disclosure of Invention
The present invention provides a control method for automatically controlling the coasting of a vehicle that overcomes at least one of the drawbacks of the prior art described above. More specifically, the control method according to the present invention can intelligently match the optimal coasting pattern according to different required coasting distances.
To this end, a first aspect of the present invention provides a control method for automatically controlling a vehicle coasting, the control method comprising the steps of: a) Detecting a deceleration distance of the vehicle while the vehicle is running, and detecting whether a driver releases an accelerator pedal; b) Comparing the detected deceleration distance with a calibrated distance threshold when the accelerator pedal is released; c) Detecting whether a current engine speed of the vehicle is greater than a first speed threshold when the deceleration distance is not greater than the distance threshold, and in the event of yes, shutting off engine fuel supply; and d) when the deceleration distance is greater than the distance threshold, detecting whether the current speed of the vehicle is between a first speed threshold and a second speed threshold that is less than the first speed threshold, and in the event that it is, causing a transmission clutch to disconnect the engine from the axle to initiate freewheeling.
According to an alternative embodiment of the invention, before said step a), the control method further comprises the step of detecting whether each of a plurality of safety auxiliary systems of the vehicle is activated, and upon activation of at least one of said plurality of safety auxiliary systems, disabling the subsequent step of starting the control method.
According to an alternative embodiment of the invention, the plurality of safety assistance systems comprises an adaptive cruise system, an electronic stability system and an advanced driving assistance system.
According to an alternative embodiment of the invention, in said step a), detecting the deceleration distance of said vehicle is detecting the distance between said vehicle and an obstacle in front or detecting a traffic sign.
According to an alternative embodiment of the invention, in said step c), the engine fuel is re-injected when the engine speed decreases to less than a second speed threshold value after cutting off the engine fuel supply, wherein said second speed threshold value is smaller than said first speed threshold value.
According to an alternative embodiment of the invention, the first speed threshold is engine idle speed +400 rpm and the second speed threshold is engine idle speed +200 rpm.
According to an alternative embodiment of the invention, in said step d), the gearbox clutch is caused to re-couple the engine with the axle when the vehicle speed decreases below said second threshold value after the engine has been disconnected from the axle.
According to an alternative embodiment of the invention, the first vehicle speed threshold is 160 km/h and the second vehicle speed threshold is 10 km/h.
A second aspect of the invention provides a control device for automatically controlling a vehicle coasting, the control device being configured to: a) Detecting a deceleration distance of the vehicle while the vehicle is running, and detecting whether a driver releases an accelerator pedal; b) Comparing the detected deceleration distance with a calibrated distance threshold when the accelerator pedal is released; c) Detecting whether a current engine speed of the vehicle is greater than a first speed threshold when the deceleration distance is not greater than the distance threshold, and in the event of yes, shutting off engine fuel supply; and d) when the deceleration distance is greater than the distance threshold, detecting whether the current speed of the vehicle is between a first speed threshold and a second speed threshold that is less than the first speed threshold, and in the event that it is, causing a transmission clutch to disconnect the engine from the axle to initiate freewheeling.
A third aspect of the invention provides a vehicle comprising a control device for automatically controlling the coasting of the vehicle according to the second aspect of the invention.
Compared with the prior art, the control method for automatically controlling the vehicle to slide has a plurality of beneficial effects, in particular: the present invention provides an intelligent coasting strategy for a vehicle to obtain an optimal coasting effect, in particular, when a small distance of the vehicle required to coast is detected, a first coasting mode for cutting off the fuel supply of an engine can be automatically selected to save fuel, and when a large distance of the vehicle required to coast is detected, a second coasting mode for freewheeling can be automatically selected to cut off the friction loss of the engine, so that the distance of the vehicle to coast is longer.
Drawings
Other features and advantages of the present invention will be better understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings. It is to be understood that the drawings are not solely for the purposes of illustration and description of the present invention, but are intended to be a definition of the limits of the invention, if so desired.
FIG. 1 is a flow chart of one embodiment of a control method for automatically controlling vehicle coasting in accordance with the present invention.
Detailed Description
The making and using of the specific embodiments are discussed in detail below. It should be understood, however, that the detailed description and the specific examples, while indicating specific ways of making and using the invention, are given by way of illustration only and are not intended to limit the scope of the invention.
The present invention aims to provide an intelligent coasting strategy capable of automatically selecting an optimal coasting mode during a deceleration phase of a vehicle. In particular, for a vehicle with a heat engine (i.e. an internal combustion engine) and a gearbox and accelerator pedal coupled to the heat engine, the intelligent slide strategy of the invention enables to automatically select either a first slide mode, in which the fuel supply to the engine is cut off, or a second slide mode, in which the freewheeling is adopted, depending on the desired deceleration distance of the vehicle, by means of a control device made up of modules such as an engine control unit (ECU-Engine Control Unit) and a gearbox control unit (TCU-Transmission Control Unit) in the vehicle. A preferred embodiment of such an intelligent taxi strategy for automatically controlling the taxiing of a vehicle according to the invention is described below with the aid of fig. 1.
When the vehicle is running, if it is found that a traffic sign such as an obstacle, a signal lamp, a speed limit sign, or the like exists at a position in front of the vehicle, the vehicle can be selectively kept coasting to reduce the vehicle speed. Before the intelligent taxi strategy is initiated, it is first necessary to detect whether each of a plurality of safety assistance systems in the vehicle is activated. These safety assistance systems include, for example, but are not limited to, adaptive cruise systems (ACC-Adaptive Cruise Control), electronic stability systems (ESP-Electronic Stability Program) and advanced driving assistance systems (ADAS-ADVANCED DRIVER ASSISTANCE SYSTEMS), the respective control units of which are communicatively connected to the engine control unit to enable the engine control unit to obtain the activation state of these systems. According to the invention, if at least one of these safety assistance systems is in an active state, the engine control unit prohibits the start of the following intelligent coasting step, that is, prohibits the start of any one of the coasting modes to ensure the safety of the vehicle running.
If these security assistance systems are all inactive, intelligent taxiing is allowed to start. First, a required deceleration distance of the vehicle is detected by the detecting means, and whether the driver releases the accelerator pedal is detected by the engine control unit. The detection means is, for example, a sensor integrated in an advanced driving assistance system, and detects a deceleration distance of the vehicle, for example, a distance between the vehicle and a preceding obstacle, or various traffic signs such as a signal lamp, a speed limit sign, a warning sign, and the like in front to be able to determine the deceleration distance.
Thereafter, if it is detected that the driver releases the accelerator pedal, the engine control unit compares the detected deceleration distance with a calibrated distance threshold. The calibrated distance threshold is for example 200 meters.
If the deceleration distance is not greater than the distance threshold, the engine control unit determines whether the first coasting mode can be started. Specifically, the engine control unit detects whether the current engine speed of the vehicle is greater than a calibrated first speed threshold. The calibrated first speed threshold is, for example, engine idle speed +400 rpm. If the current engine speed is not greater than the first speed threshold, shutting down the engine fuel supply is prohibited to avoid engine stall. If the current engine speed is greater than the first speed threshold, the engine control unit sends a command to the engine to shut off the engine fuel supply, and the vehicle enters a first coasting mode in which fuel is shut off to enable fuel saving during shorter coasting distances. Thereafter, the engine speed is reduced and the engine fuel supply is maintained shut off until the engine control unit detects that the engine speed has decreased to less than the calibrated second speed threshold, at which point the engine control unit sends a command to the engine to re-inject engine fuel to avoid engine stall. The calibrated second speed threshold is, for example, less than the first speed threshold, for example, engine idle speed +200 revolutions per minute.
If the deceleration distance is greater than the distance threshold, the engine control unit sends a command to the gearbox control unit to start the second sliding mode, and the gearbox control unit needs to judge whether the second sliding mode can be started after receiving the command. Specifically, the transmission control unit detects whether a current vehicle speed of the vehicle is between a calibrated first vehicle speed threshold and a calibrated second vehicle speed threshold that is less than the first vehicle speed threshold. The calibrated first threshold vehicle speed is, for example, 160 km/h and the calibrated second threshold vehicle speed is, for example, 10 km/h. If the current vehicle speed is not between the first and second vehicle speed thresholds, freewheeling is inhibited, i.e., the transmission clutch is inhibited from disconnecting the engine from the axle. If the current vehicle speed is between the first and second vehicle speed thresholds, the transmission control unit sends a command to the transmission to disengage the transmission clutch from the axle to start freewheeling, and the vehicle enters a second coasting mode under freewheeling to be able to cut off engine friction losses during longer range coasting. Thereafter, the vehicle speed is reduced and freewheeling is maintained until the transmission control unit detects that the vehicle speed has reduced to less than the second speed threshold, at which point the transmission control unit sends a command to the transmission to cause the transmission clutch to re-couple the engine with the axle to exit freewheeling.
While the foregoing has described the technical content and features of the present invention, it will be appreciated that those skilled in the art, upon attaining the teachings of the present invention, may make variations and improvements to the concepts disclosed herein, which fall within the scope of the present invention.
The above description of embodiments is illustrative and not restrictive, and the scope of the invention is defined by the claims.

Claims (10)

1. A control method for automatically controlling coasting of a vehicle, characterized by comprising the steps of:
a) Detecting a deceleration distance of the vehicle while the vehicle is running, and detecting whether a driver releases an accelerator pedal;
b) Comparing the detected deceleration distance with a calibrated distance threshold when the accelerator pedal is released;
c) Detecting whether a current engine speed of the vehicle is greater than a first speed threshold when the deceleration distance is not greater than the distance threshold, and in the event of yes, shutting off engine fuel supply; and
D) When the deceleration distance is greater than the distance threshold, detecting whether the current vehicle speed of the vehicle is between a first vehicle speed threshold and a second vehicle speed threshold that is less than the first vehicle speed threshold, and in the event of yes, causing a transmission clutch to disconnect the engine from the axle to initiate freewheeling.
2. The control method for automatically controlling coasting of a vehicle according to claim 1, further comprising, prior to the step a), a step of detecting whether each of a plurality of safety assistance systems of the vehicle is activated, and prohibiting a subsequent step of starting the control method when at least one of the plurality of safety assistance systems is activated.
3. The control method for automatically controlling coasting of a vehicle of claim 2 wherein the plurality of safety assistance systems comprises an adaptive cruise system, an electronic stability system, and an advanced driving assistance system.
4. A control method for automatically controlling the coasting of a vehicle according to any one of claims 1 to 3, characterized in that in the step a), the deceleration distance of the vehicle is detected as the distance between the vehicle and a preceding obstacle or a traffic sign is detected.
5. A control method for automatically controlling the coasting of a vehicle according to any one of claims 1 to 3, characterized in that in said step c) the engine fuel is reinjected when the engine speed decreases to less than a second speed threshold value after the engine fuel supply is cut off, wherein said second speed threshold value is smaller than said first speed threshold value.
6. The control method for automatically controlling coasting of a vehicle of claim 5 wherein the first speed threshold is engine idle speed +400 rpm and the second speed threshold is engine idle speed +200 rpm.
7. A control method for automatically controlling the coasting of a vehicle according to any one of claims 1 to 3, characterized in that in said step d) the gearbox clutch is caused to re-couple the engine with the axle when the vehicle speed decreases below said second threshold value after the engine has been disconnected from the axle.
8. The control method for automatically controlling coasting of a vehicle of claim 7 wherein the first threshold vehicle speed is 160 km/h and the second threshold vehicle speed is 10 km/h.
9. A control device for automatically controlling the coasting of a vehicle, characterized in that the control device is configured to:
a) Detecting a deceleration distance of the vehicle while the vehicle is running, and detecting whether a driver releases an accelerator pedal;
b) Comparing the detected deceleration distance with a calibrated distance threshold when the accelerator pedal is released;
c) Detecting whether a current engine speed of the vehicle is greater than a first speed threshold when the deceleration distance is not greater than the distance threshold, and in the event of yes, shutting off engine fuel supply; and
D) When the deceleration distance is greater than the distance threshold, detecting whether the current vehicle speed of the vehicle is between a first vehicle speed threshold and a second vehicle speed threshold that is less than the first vehicle speed threshold, and in the event of yes, causing a transmission clutch to disconnect the engine from the axle to initiate freewheeling.
10. A vehicle characterized in that it comprises a control device for automatically controlling the coasting of the vehicle according to claim 9.
CN202211631136.3A 2022-12-19 2022-12-19 Control method for automatically controlling the coasting of a vehicle and associated control device Pending CN118220145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211631136.3A CN118220145A (en) 2022-12-19 2022-12-19 Control method for automatically controlling the coasting of a vehicle and associated control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211631136.3A CN118220145A (en) 2022-12-19 2022-12-19 Control method for automatically controlling the coasting of a vehicle and associated control device

Publications (1)

Publication Number Publication Date
CN118220145A true CN118220145A (en) 2024-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN118220145A (en)

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