CN111942388B - Engine start-stop control method and device and hybrid vehicle - Google Patents
Engine start-stop control method and device and hybrid vehicle Download PDFInfo
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- CN111942388B CN111942388B CN201910411881.9A CN201910411881A CN111942388B CN 111942388 B CN111942388 B CN 111942388B CN 201910411881 A CN201910411881 A CN 201910411881A CN 111942388 B CN111942388 B CN 111942388B
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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
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18018—Start-stop drive, e.g. in a traffic jam
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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
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
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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
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
- B60W2510/244—Charge state
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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
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
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Abstract
The invention discloses an engine start-stop control method, an engine start-stop control device and a hybrid power vehicle, wherein the method comprises the following steps: under the condition that an engine of the vehicle is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value, controlling the engine to be started; under the condition that the engine is in an opening state, if the speed of the vehicle is less than a second vehicle speed threshold value, controlling the engine to be closed; the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, the first vehicle speed threshold value and the second vehicle speed threshold value are both larger than or equal to a preset vehicle speed threshold value, and the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle. The engine starting and stopping control method provided by the invention starts the engine only under the condition that the vehicle runs at a higher speed, and the noise generated by the operation of the engine can be better covered because the vehicle can generate larger noise when running at the higher speed, so that the NVH performance of the vehicle can be greatly improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an engine start-stop control method and device and a hybrid power vehicle.
Background
Hybrid Electric Vehicle (HEV) is a new generation clean Vehicle equipped with two power sources, i.e. a thermal power source and an electric power source, and has the advantages of low oil consumption and low pollution. The hybrid vehicle makes up the weakness of engine driving by using the driving motor, so that the engine can be kept to work under the optimal working condition as much as possible, and the functions of idling stop, auxiliary driving, regenerative braking energy recovery and the like of the engine can be realized.
The engine start-stop time of the hybrid vehicle has great influence on the economic performance, Noise, Vibration and Harshness (NVH) performance, power performance and the like of the whole vehicle.
Disclosure of Invention
The embodiment of the invention aims to provide an engine start-stop control method and device and a hybrid power vehicle, and solves the problem that the NVH performance of the whole vehicle is poor due to the existing engine start-stop mode.
In order to achieve the above object, an embodiment of the present invention provides an engine start-stop control method applied to a hybrid vehicle, the method including:
under the condition that an engine of the vehicle is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value, controlling the engine to be started;
under the condition that the engine is in an opening state, if the speed of the vehicle is less than a second vehicle speed threshold value, controlling the engine to be closed;
the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, both the first vehicle speed threshold value and the second vehicle speed threshold value are larger than or equal to a preset vehicle speed threshold value, and the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle.
Optionally, under the condition that the engine of the vehicle is in a closed state, if the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold value, controlling the engine to be started, including:
and under the condition that the engine of the vehicle is in a closed state, if the speed of the vehicle is greater than or equal to a first vehicle speed threshold value and the total vehicle required power of the vehicle is greater than or equal to a first power threshold value, controlling the engine to be started.
Optionally, under the condition that the engine is in the on state, if the vehicle speed of the vehicle is less than a second vehicle speed threshold, controlling the engine to be turned off includes:
and under the condition that the engine is in an on state, if the speed of the vehicle is less than a second vehicle speed threshold value and the total vehicle required power of the vehicle is less than a second power threshold value, controlling the engine to be off, wherein the second power threshold value is less than or equal to the first power threshold value.
Optionally, the second power threshold is greater than a preset load power threshold, and the preset load power threshold is related to the economic performance parameter of the vehicle.
Optionally, when the second vehicle speed threshold is smaller than the first vehicle speed threshold, an absolute value of a difference between the second vehicle speed threshold and the first vehicle speed threshold is greater than or equal to a preset threshold.
Optionally, under the condition that the engine of the vehicle is in a closed state, if the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold value, controlling the engine to be started, including:
and under the condition that the residual electric quantity of the vehicle is lower than a preset electric quantity threshold value and the engine is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value, controlling the engine to be started.
Optionally, the first vehicle speed threshold and the second vehicle speed threshold are both positively correlated with the remaining electric quantity of the vehicle.
Optionally, the first power threshold and the second power threshold are both positively correlated with the remaining capacity of the vehicle.
The embodiment of the invention also provides an engine start-stop control device which is arranged on a hybrid power vehicle, and the device comprises:
the first control module is used for controlling the engine of the vehicle to be started if the speed of the vehicle is greater than or equal to a first vehicle speed threshold value under the condition that the engine of the vehicle is in a closed state;
the second control module is used for controlling the engine to be closed if the speed of the vehicle is less than a second vehicle speed threshold value under the condition that the engine is in an opening state;
the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, both the first vehicle speed threshold value and the second vehicle speed threshold value are larger than or equal to a preset vehicle speed threshold value, and the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle.
Optionally, the first control module is configured to, when the engine of the vehicle is in a closed state, control the engine to be turned on if the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold and the total vehicle power demand of the vehicle is greater than or equal to a first power threshold.
Optionally, the second control module is configured to, when the engine is in an on state, control the engine to be turned off if the speed of the vehicle is less than a second vehicle speed threshold and the total power demand of the vehicle is less than a second power threshold, where the second power threshold is less than or equal to the first power threshold.
Optionally, the second power threshold is greater than a preset load power threshold, and the preset load power threshold is related to the economic performance parameter of the vehicle.
Optionally, when the second vehicle speed threshold is smaller than the first vehicle speed threshold, an absolute value of a difference between the second vehicle speed threshold and the first vehicle speed threshold is greater than or equal to a preset threshold.
Optionally, the first control module is configured to, under the condition that the remaining power of the vehicle is lower than a preset power threshold and the engine is in an off state, control the engine to be turned on if the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold.
Optionally, both the first vehicle speed threshold and the second vehicle speed threshold are positively correlated with the remaining electric quantity of the vehicle.
Optionally, the first power threshold and the second power threshold are both positively correlated with the remaining capacity of the vehicle.
The embodiment of the invention also provides a hybrid vehicle which comprises the engine start-stop control device provided by the embodiment of the invention.
According to the engine start-stop control method in the embodiment of the invention, the engine is started only under the condition that the vehicle runs at a higher speed, and the vehicle can generate larger noise when running at the higher speed, so that the noise generated by the operation of the engine can be better covered, the condition that the engine is started at a lower speed to bring larger noise experience to users is avoided, and the NVH performance of the vehicle can be greatly improved.
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FIG. 1 is a flowchart of an engine start/stop control method according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of another engine start-stop control method provided by the embodiment of the invention;
fig. 3 is a schematic structural diagram of an engine start-stop control device according to an embodiment of the present invention.
Detailed Description
To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a flowchart of an engine start-stop control method applied to a hybrid vehicle according to an embodiment of the present invention, where as shown in fig. 1, the engine start-stop control method includes the following steps:
the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, the first vehicle speed threshold value and the second vehicle speed threshold value are both larger than or equal to a preset vehicle speed threshold value, the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle, and the NVH performance parameters of the vehicle comprise noise, vibration and sound vibration roughness of the vehicle.
The hybrid vehicle is an extended-range vehicle, generally, under the condition that the electric quantity of the vehicle is sufficient, the engine of the vehicle does not need to be started, the vehicle power is provided only by relying on a vehicle battery, and the engine of the vehicle is used as a supplementary energy source and can be started under the condition that the electric quantity of the vehicle is not sufficient to provide the required power of the whole vehicle, so that the vehicle continues the journey.
In practical application, when the vehicle running speed is slow, the whole road noise, the wind noise and other background noises are small, the starting of the engine brings great noise feeling to users, so that the NVH performance of the vehicle is poor, when the vehicle running speed is fast, the whole road noise, the wind noise and other background noises are relatively increased, and the noise generated by starting the engine can be covered to a great extent, so that the NVH performance of the vehicle can be improved in a certain program.
In this embodiment, in the driving process of the hybrid vehicle, the start-stop state of the engine of the vehicle may be first obtained, the start-stop state of the engine is monitored in real time, and then the start-stop state of the engine may be controlled according to the vehicle speed of the vehicle by further combining the obtained start-stop state of the engine and the vehicle speed of the vehicle (e.g., monitoring the vehicle speed of the vehicle in real time).
Specifically, under the condition that an engine of the vehicle is in a closed state, whether the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold value or not may be judged, and if the vehicle speed of the vehicle is monitored to be greater than or equal to the first vehicle speed threshold value, the engine may be controlled to be started, so as to ensure better NVH performance and power performance of the vehicle; the first vehicle speed threshold is greater than or equal to a preset vehicle speed threshold, the preset vehicle speed threshold is related to the NVH performance parameters of the vehicle, that is, the preset vehicle speed threshold may be set according to the NVH performance parameters of the vehicle, and may be specifically determined by testing the NVH performance parameters of the vehicle when the engine is started at different vehicle speeds, so as to ensure that the vehicle can have better NVH performance when the engine is started when the vehicle speed is greater than the first vehicle speed threshold.
Under the condition that the engine of the vehicle is in an on state, whether the speed of the vehicle is smaller than a second vehicle speed threshold value or not can be judged, and if the speed of the vehicle is monitored to be smaller than the second vehicle speed threshold value, the engine can be controlled to be closed, so that the better NVH performance of the vehicle is ensured; the second vehicle speed threshold value is also larger than or equal to the preset vehicle speed threshold value, so that the engine is in a closed state under the condition that the vehicle speed is lower than the preset vehicle speed threshold value, and better NVH performance of the vehicle is further ensured.
For example, the preset vehicle speed threshold is 30km/h, the first vehicle speed threshold is 50km/h, the second vehicle speed threshold is 40km/h, and noises such as road noise and wind noise generated after the vehicle usually runs at a speed exceeding 40km/h become larger gradually, so that the noises generated by the engine can be better covered, therefore, the engine of the vehicle is in a closed state when the vehicle speed is lower than 40km/h, so that the NVH performance of the vehicle is not affected, when the vehicle speed reaches more than 50km/h, the engine of the vehicle is triggered to start, and starting the engine at the current vehicle speed does not affect the NVH performance of the vehicle, and the purpose of avoiding frequent starting and stopping of the engine can be achieved.
In addition, the second vehicle speed threshold value is set, so that the engine can be ensured to be in a closed state when the vehicle is in a parking state, and the aims of eliminating the idling of the engine, prolonging the shutdown time of the engine and improving the economy of the vehicle are fulfilled.
In this embodiment, the second vehicle speed threshold is less than or equal to the first vehicle speed threshold, so that the vehicle can be ensured to start the engine when the vehicle speed is relatively high, and to shut down the engine when the vehicle speed is relatively low, so as to match the NVH performance and the power performance of the vehicle.
Optionally, when the second vehicle speed threshold is smaller than the first vehicle speed threshold, an absolute value of a difference between the second vehicle speed threshold and the first vehicle speed threshold is greater than or equal to a preset threshold.
In order to avoid frequent start and stop of the engine, the second vehicle speed threshold may be smaller than the first vehicle speed threshold, and an absolute value of a difference between the first vehicle speed threshold and the second vehicle speed threshold may be greater than or equal to a preset threshold, where the preset threshold may be determined by counting a speed fluctuation range of the vehicle under a general driving condition, and for example, the preset threshold may be 10km/h, 15km/h, or 20 km/h.
Therefore, by reasonably setting the first vehicle speed threshold value and the second vehicle speed threshold value, the engine can be prevented from being started and stopped frequently due to vehicle speed fluctuation in driving, and the NVH performance, the economic performance and the service life of the engine are further ensured.
Optionally, the step 101 includes:
and under the condition that the engine of the vehicle is in a closed state, if the speed of the vehicle is greater than or equal to a first vehicle speed threshold value and the total vehicle required power of the vehicle is greater than or equal to a first power threshold value, controlling the engine to be started.
In this embodiment, in order to further ensure the power performance of the vehicle, the required power of the entire vehicle of the vehicle may be introduced into the starting condition of the engine, specifically, under the condition that the engine is in a closed state, it is determined whether both the vehicle speed and the required power of the entire vehicle of the vehicle satisfy the condition for triggering the engine to start.
Under the condition that the engine is in the closed state, when the present whole car required power of vehicle is greater than or equal to first power threshold value, promptly the present power demand of vehicle is higher, just the present speed of a motor vehicle is greater than or equal to first speed of a motor vehicle threshold value, the speed of a motor vehicle at this moment promptly can guarantee during the NVH performance demand of vehicle, can control the engine is opened, with pass through the engine does the vehicle provides the power source, can guarantee again simultaneously the NVH performance that the vehicle possesses the preferred.
The first power threshold value can be determined by integrating the NVH performance, the economic performance and the power performance of the vehicle according to the requirements of specific vehicle types to ensure that the starting time of the engine can ensure that the vehicle has better NVH performance, economic performance and power performance, and can be determined by combining the parameters of the whole vehicle weight, the wind resistance and the like of the vehicle.
Optionally, the step 102 includes:
and under the condition that the engine is in an on state, if the speed of the vehicle is less than a second vehicle speed threshold value and the total vehicle required power of the vehicle is less than a second power threshold value, controlling the engine to be off, wherein the second power threshold value is less than or equal to the first power threshold value.
In this embodiment, the required power of the entire vehicle of the vehicle may be introduced into the shut-off condition of the engine, specifically, it is determined whether both the vehicle speed and the required power of the entire vehicle meet the condition for triggering the engine to shut off when the engine is in the on state.
Under the condition that the engine is in the on-state, work as the present whole car demand power of vehicle is less than the second power threshold value, promptly the present power demand of vehicle is not high, just the present speed of a motor vehicle is less than the second speed of a motor vehicle threshold value, the speed of a motor vehicle at this moment promptly is lower can not guarantee during the NVH performance demand of vehicle, can control the engine is closed, with pass through the battery of vehicle does the vehicle provides the power source, avoids this moment the engine starts and causes whole car NVH performance relatively poor, can also reach to a certain extent simultaneously and avoid the engine frequently opens the effect of stopping.
The second power threshold value can also be determined by integrating the NVH performance, the economic performance and the power performance of the vehicle according to the requirements of specific vehicle types, so that the vehicle can be guaranteed to have better NVH performance, economic performance and power performance when the engine is closed.
In this embodiment, the second power threshold is less than or equal to the first power threshold, so that it can be ensured that the engine is turned on only when the required power of the entire vehicle is large, and the engine is turned off when the required power of the entire vehicle is small, so as to match the power performance of the vehicle.
Optionally, the second power threshold is smaller than the first power threshold.
In order to avoid frequent starting and stopping of the engine and prolong the starting time and the shutdown time of the engine, the second power threshold value can be smaller than the first power threshold value, so that the engine is prevented from needing to be started and stopped frequently due to frequent acceleration and deceleration of a driver, and the NVH performance, the economic performance and the service life of the engine are further guaranteed. For example, the first power threshold may be 20kw, and the second power threshold may be 10kw, so that the vehicle controls the engine to be turned off only on the premise that the required power of the entire vehicle is less than 10 kw.
Optionally, the second power threshold is greater than a preset load power threshold, and the preset load power threshold is related to the economic performance parameter of the vehicle.
In order to improve the economy of the whole vehicle, the second power threshold value may be greater than a preset load power threshold value, and the preset load power threshold value may be related to an economic performance parameter of the vehicle, that is, the preset load power threshold value may be determined according to the economic performance parameter of the vehicle, where the economic performance parameter may include parameters such as fuel consumption, energy conversion efficiency, and engine loss. For example, since the output power of the vehicle is low when the vehicle is operated in a low load state, and the economic performance is poor, the preset load power threshold may be a low load power of the vehicle, and is generally about several kilowatts.
Therefore, the second power threshold value is larger than the low-load power of the vehicle, so that the engine can be ensured to be in a closed state in a low-load state, and the aim of improving the economic performance of the vehicle can be fulfilled.
Optionally, the step 101 includes:
and under the condition that the residual electric quantity of the vehicle is lower than a preset electric quantity threshold value and the engine is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value, controlling the engine to be started.
In this embodiment, in order to reduce unnecessary engine start scenes and further improve the economic performance and NVH performance of the vehicle, the step 101 may be executed only when the remaining power of the vehicle is lower than a preset power threshold, specifically, the remaining power of the vehicle may be obtained first, whether the remaining power is lower than the preset power threshold is determined, if the remaining power is lower than the preset power threshold and the engine is in a closed state, whether an engine start condition is currently met is further determined according to the vehicle speed of the vehicle, that is, whether the vehicle speed is greater than or equal to a first vehicle speed threshold is determined, and the engine is controlled to be started when the vehicle speed is greater than or equal to the first vehicle speed threshold.
The preset electric quantity threshold value may be determined according to an actual use requirement of the vehicle or a battery performance, for example, the preset electric quantity threshold value is reasonably set to ensure that a mileage that the vehicle can travel between 100% of electric quantity and the preset electric quantity threshold value can meet a daily requirement of a user, so as to reduce fuel consumption, or ensure that the battery of the vehicle can have better performance and longer service life when the battery works for a long time between 100% of electric quantity and the preset electric quantity threshold value, and for example, the preset electric quantity threshold value may be about 10% to 20% of electric quantity.
It should be noted that, when the remaining power of the vehicle is greater than or equal to the preset power threshold, the engine may be controlled to remain in the shutdown state, and the entire vehicle power is provided only through the battery of the vehicle, so as to save fuel consumption and further ensure better NVH performance of the vehicle.
Optionally, the first vehicle speed threshold value and the second vehicle speed threshold value are both positively associated with a remaining amount of electric power of the vehicle.
In this embodiment, both the first vehicle speed threshold and the second vehicle speed threshold may be positively correlated with the remaining power of the vehicle, and specifically may decrease with the decrease of the remaining power and increase with the increase of the remaining power.
In this way, in the driving process, along with the reduction of the remaining electric quantity of the vehicle, both the first vehicle speed threshold value and the second vehicle speed threshold value may be adjusted in real time according to the change of the remaining electric quantity, specifically, the first vehicle speed threshold value and the second vehicle speed threshold value under different remaining electric quantities may be obtained according to real vehicle test data before the vehicle leaves a factory, or the first vehicle speed threshold value and the second vehicle speed threshold value may be dynamically adjusted according to the change of the remaining electric quantity of the vehicle.
The lower the remaining power of the vehicle is, the smaller the first vehicle speed threshold value and the second vehicle speed threshold value are, specifically, when the remaining power of the vehicle is reduced to the preset power threshold value, the first vehicle speed threshold value and the second vehicle speed threshold value may be higher vehicle speed values, and when the remaining power of the vehicle is further reduced, the first vehicle speed threshold value and the second vehicle speed threshold value may be correspondingly reduced to limit power consumption of the vehicle.
Optionally, the first power threshold and the second power threshold are both positively correlated with the remaining capacity of the vehicle.
In this embodiment, the first power threshold value and the second power threshold value may be both associated with the remaining capacity of the vehicle, and specifically may decrease with a decrease in the remaining capacity and increase with an increase in the remaining capacity.
In this way, when the remaining power of the vehicle is reduced, both the first power threshold and the second power threshold may be adjusted in real time according to a change of the remaining power, specifically, the first power threshold and the second power threshold under different remaining power may be obtained according to real vehicle test data before the vehicle leaves a factory, or the first power threshold and the second power threshold may be dynamically adjusted according to a change of the remaining power of the vehicle.
The smaller the remaining power of the vehicle is, the smaller the first power threshold and the second power threshold are, specifically, when the remaining power of the vehicle is reduced to the preset power threshold, the first vehicle speed threshold and the second vehicle speed threshold may be higher power values, and when the remaining power of the vehicle is further reduced, the first power threshold and the second power threshold may be correspondingly reduced to limit the power consumption of the vehicle.
According to the engine start-stop control method in the embodiment of the invention, the engine is started only under the condition that the vehicle runs at a higher speed, and the vehicle can generate larger noise when running at the higher speed, so that the noise generated by the operation of the engine can be better covered, the condition that the engine is started at a lower speed and brings larger noise experience to users is avoided, and the aim of improving the NVH performance of the vehicle is further achieved.
Referring to fig. 2, a specific implementation of an embodiment of the present invention is illustrated below, and referring to fig. 2, an engine start-stop control method provided in another embodiment of the present invention includes the following steps:
and step 201, controlling an engine of the hybrid vehicle to be in a closed state.
if so, go to step 203, otherwise go to step 201.
if so, go to step 204, otherwise go to step 201.
And step 204, controlling the engine to be in an opening state.
if so, go to step 201, otherwise go to step 204.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an engine start-stop control apparatus according to an embodiment of the present invention, and as shown in fig. 3, the engine start-stop control apparatus 300 includes:
the first control module 301 is configured to, when an engine of the vehicle is in an off state, control the engine to be turned on if a vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold value;
the second control module 302 is configured to, when the engine is in an on state, control the engine to be turned off if the vehicle speed of the vehicle is less than a second vehicle speed threshold;
the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, both the first vehicle speed threshold value and the second vehicle speed threshold value are larger than or equal to a preset vehicle speed threshold value, and the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle.
Optionally, the first control module 301 is configured to, when the engine of the vehicle is in a closed state, control the engine to be turned on if the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold and the total vehicle power demand of the vehicle is greater than or equal to a first power threshold.
Optionally, the second control module 302 is configured to, when the engine is in an on state, control the engine to be turned off if the speed of the vehicle is less than a second speed threshold and the total power demand of the vehicle is less than a second power threshold, where the second power threshold is less than or equal to the first power threshold.
Optionally, the second power threshold is greater than a preset load power threshold, and the preset load power threshold is related to the economic performance parameter of the vehicle.
Optionally, when the second vehicle speed threshold is smaller than the first vehicle speed threshold, an absolute value of a difference between the second vehicle speed threshold and the first vehicle speed threshold is greater than or equal to a preset threshold.
Optionally, the first control module 301 is configured to, under the condition that the remaining power of the vehicle is lower than a preset power threshold and the engine is in an off state, control the engine to be turned on if the vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold.
Optionally, the first vehicle speed threshold and the second vehicle speed threshold are both positively correlated with the remaining electric quantity of the vehicle.
Optionally, the first power threshold and the second power threshold are both positively correlated with the remaining capacity of the vehicle.
The engine start-stop control device 300 can implement the processes in the method embodiments shown in fig. 1 and fig. 2, and is not described herein again to avoid repetition.
The engine start-stop control device 300 in the embodiment of the invention can control the start-stop state of the engine according to the vehicle speed of the hybrid vehicle, and the engine is started only under the condition of higher vehicle running speed, and because the vehicle can generate larger noise when running at higher speed, the noise generated by the engine can be better covered to avoid the larger noise experience brought to users by starting the engine under the condition of lower vehicle speed, thereby achieving the purpose of improving the NVH performance of the vehicle.
An embodiment of the present invention further provides a hybrid vehicle, including the engine start/stop control device provided in the embodiment shown in fig. 3, in this embodiment, the vehicle can achieve the same beneficial effects as the embodiment shown in fig. 3, and in order to avoid repetition, details are not repeated here.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. An engine start-stop control method applied to a hybrid vehicle is characterized by comprising the following steps:
under the condition that an engine of the vehicle is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value, controlling the engine to be started;
under the condition that the engine is in an opening state, if the speed of the vehicle is less than a second vehicle speed threshold value, controlling the engine to be closed;
the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, both the first vehicle speed threshold value and the second vehicle speed threshold value are larger than or equal to a preset vehicle speed threshold value, and the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle;
when the second vehicle speed threshold value is smaller than the first vehicle speed threshold value, the absolute value of the difference between the second vehicle speed threshold value and the first vehicle speed threshold value is larger than or equal to a preset threshold value;
the first vehicle speed threshold value and the second vehicle speed threshold value are positively correlated with the remaining electric quantity of the vehicle.
2. The method of claim 1, wherein controlling the engine of the vehicle to turn on if a vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold with the engine of the vehicle in an off state comprises:
and under the condition that the engine of the vehicle is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value and the total power demand of the vehicle is greater than or equal to a first power threshold value, controlling the engine to be started.
3. The method of claim 2, wherein controlling the engine to shut down if the vehicle speed of the vehicle is less than a second vehicle speed threshold with the engine on comprises:
and under the condition that the engine is in an on state, if the speed of the vehicle is less than a second speed threshold value and the total vehicle required power of the vehicle is less than a second power threshold value, controlling the engine to be turned off, wherein the second power threshold value is less than or equal to the first power threshold value.
4. The method of claim 3, wherein the second power threshold is greater than a preset load power threshold, the preset load power threshold being related to an economic performance parameter of the vehicle.
5. The method of any one of claims 1-4, wherein controlling the engine of the vehicle to turn on if a vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold with the engine off comprises:
and under the condition that the residual electric quantity of the vehicle is lower than a preset electric quantity threshold value and the engine is in a closed state, if the speed of the vehicle is greater than or equal to a first speed threshold value, controlling the engine to be started.
6. The method of claim 3 or 4, wherein the first power threshold and the second power threshold are both positively correlated to a remaining charge of the vehicle.
7. An engine start-stop control device provided in a hybrid vehicle, the device comprising:
the first control module is used for controlling the engine to be started if the speed of the vehicle is greater than or equal to a first vehicle speed threshold value under the condition that the engine of the vehicle is in a closed state;
the second control module is used for controlling the engine to be closed if the speed of the vehicle is less than a second vehicle speed threshold value under the condition that the engine is in an opening state;
the second vehicle speed threshold value is smaller than or equal to the first vehicle speed threshold value, both the first vehicle speed threshold value and the second vehicle speed threshold value are larger than or equal to a preset vehicle speed threshold value, and the preset vehicle speed threshold value is set according to NVH performance parameters of the vehicle;
when the second vehicle speed threshold value is smaller than the first vehicle speed threshold value, the absolute value of the difference between the second vehicle speed threshold value and the first vehicle speed threshold value is larger than or equal to a preset threshold value;
the first vehicle speed threshold value and the second vehicle speed threshold value are positively correlated with the remaining electric quantity of the vehicle.
8. The engine start-stop control device according to claim 7, wherein the first control module is configured to control the engine to be started if the speed of the vehicle is greater than or equal to a first speed threshold and the total power demand of the vehicle is greater than or equal to a first power threshold when the engine of the vehicle is in a shut-off state.
9. The engine start-stop control device according to claim 8, wherein the second control module is configured to control the engine to be turned off if the vehicle speed of the vehicle is less than a second vehicle speed threshold and the total vehicle power demand of the vehicle is less than a second power threshold when the engine is in an on state, where the second power threshold is less than or equal to the first power threshold.
10. The engine start-stop control apparatus of claim 9, wherein the second power threshold is greater than a preset load power threshold, the preset load power threshold being related to an economic performance parameter of the vehicle.
11. The engine start-stop control device according to any one of claims 7 to 10, wherein the first control module is configured to control the engine to be started if a vehicle speed of the vehicle is greater than or equal to a first vehicle speed threshold value when the remaining capacity of the vehicle is lower than a preset capacity threshold value and the engine is in an off state.
12. The engine start-stop control device according to claim 9 or 10, wherein the first power threshold and the second power threshold are both positively correlated with the remaining capacity of the vehicle.
13. A hybrid vehicle characterized by comprising the engine start-stop control apparatus according to any one of claims 7 to 12.
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