CN112428789B - Method and system for graded management of electric load of engine - Google Patents

Method and system for graded management of electric load of engine Download PDF

Info

Publication number
CN112428789B
CN112428789B CN202011241070.8A CN202011241070A CN112428789B CN 112428789 B CN112428789 B CN 112428789B CN 202011241070 A CN202011241070 A CN 202011241070A CN 112428789 B CN112428789 B CN 112428789B
Authority
CN
China
Prior art keywords
load
engine
module
condition
torque
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.)
Active
Application number
CN202011241070.8A
Other languages
Chinese (zh)
Other versions
CN112428789A (en
Inventor
张顺
李儒龙
程晓军
陈中天
王冬
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.)
Dongfeng Motor Corp
Original Assignee
Dongfeng Motor Corp
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 Dongfeng Motor Corp filed Critical Dongfeng Motor Corp
Priority to CN202011241070.8A priority Critical patent/CN112428789B/en
Publication of CN112428789A publication Critical patent/CN112428789A/en
Application granted granted Critical
Publication of CN112428789B publication Critical patent/CN112428789B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/3208—Vehicle drive related control of the compressor drive means, e.g. for fuel saving purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3266—Cooling devices information from a variable is obtained related to the operation of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3269—Cooling devices output of a control signal
    • B60H2001/327—Cooling devices output of a control signal related to a compressing unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention discloses a method and a system for managing an engine power load in a grading way, wherein when the engine power load works, whether an engine load management mode is entered or not is judged based on an engine load management identification module; reducing the target voltage of the generator and/or disconnecting the load of the air conditioner compressor based on the deviation value of the driver required torque and the actual torque; and controlling the off-time of the load of the air conditioner compressor based on the maximum off-time limit of the load of the air conditioner compressor. The invention not only improves the dynamic property of the whole vehicle and optimizes the comfort of a driver, but also balances the dynamic property and the comfort of the whole vehicle.

Description

Method and system for graded management of electric load of engine
Technical Field
The invention belongs to the technical field of engine control, and particularly discloses a method and a system for graded management of an electric load of an engine.
Background
With the popularization and application of a small-displacement turbocharger, before the turbocharger is involved, a 1.0L supercharged engine is only equivalent to a 1.0 natural air suction engine, the output torque of the engine is limited, the effective air input of the engine is reduced along with the rise of the altitude, the output torque of the engine can be further reduced, in the acceleration process of a vehicle, the engine not only needs to overcome the friction pumping loss of the engine body, but also needs to overcome external loads such as the road friction resistance, the wind resistance, the power utilization load and the like of the vehicle, when the output torque of the engine is not enough to overcome the external loads, the vehicle is easy to have the phenomena of acceleration weakness, power limitation and the like, the driving feeling of a driver is influenced, and the brand image of the whole vehicle is influenced.
The technical scheme of the engine load control system and the control method thereof (patent number: CN201210268963.0) is as follows: the patent discloses an engine load control system detects throttle position sensor's return signal, through relevant signal such as the speed of a motor vehicle, engine speed, the opening angle of throttle and the rate of change of opening angle at that time of analysis, whether intelligent judgement engine belongs to low rotational speed heavy load operating condition, whether need cut off high-power load such as air conditioner compressor in good time. Therefore, the effective output power of the engine is improved in a short time, the engine can enter a better working state as soon as possible, and the purposes of saving energy, reducing emission and improving the practical comfort of small-displacement automobiles are achieved. This patent suffers from the following drawbacks: 1. the method only aims at the state judgment of low speed and large load, does not consider the conditions of rapid acceleration and the like of the vehicle, and does not consider the influence of altitude environmental factors and the like on the output torque of the engine; 2. the patent only describes that the load of the air conditioner compressor is disconnected, the technical means is single, and technical methods based on reducing the charging load of the intelligent generator and the like are not described; 3. the patent considers that the power performance of the vehicle is improved by disconnecting high-power accessories such as an air conditioner compressor, the disconnection time is not clearly and effectively limited, the disconnection time of the air conditioner compressor is too long, the comfort of drivers and passengers is influenced by factors such as cabin temperature rise, and the disconnection time is not limited; 4. this patent does not control target voltages of an air-conditioning compressor and a generator mounted on an engine in a stepwise manner.
Disclosure of Invention
In order to eliminate the technical problems mentioned in the background technology, the invention provides a graded management method for the power utilization load of an engine, which not only improves the power performance of the whole vehicle and optimizes the comfort of a driver, but also balances the power performance and the comfort of the whole vehicle.
The invention discloses a grading management method for an engine power load, which is characterized in that when the engine power load works, whether an engine load management mode is entered or not is judged based on an engine load management identification module; reducing the target voltage of the generator and/or disconnecting the load of the air conditioner compressor based on the deviation value of the driver required torque and the actual torque; and controlling the off-time of the load of the air conditioner compressor based on the maximum off-time limit of the load of the air conditioner compressor.
In a preferred embodiment of the present invention, the engine load management identification module comprises: step one, collecting the opening degree of an accelerator pedal of a vehicle, the speed of the vehicle, the rotating speed of an engine, the torque of an engine clutch and the pressure value of an atmospheric pressure sensor, and inputting the pressure values into an engine load management identification module, wherein the engine load management identification module comprises four judgment modules; and step two, judging whether to enter an engine load management mode or not based on output results of the four judging modules.
In a preferred embodiment of the present invention, the enabling conditions of the first determining module are: the accelerator pedal opening is greater than the opening limit K0, and the vehicle speed is greater than the limit V0, it is considered that condition 1 is satisfied; the enabling conditions of the second judging module are as follows: the engine clutch torque is larger than or equal to the maximum output torque M1 of the engine under the current working condition, or the vehicle is in a starting assisting stage and the ambient pressure is lower than the pressure P0; the enabling conditions of the third judging module are as follows: when the engine is in a starting or repeated starting condition, the delay time exceeds t 0; the enabling condition of the fourth judging module is as follows: after the engine is started, the number of times of entering load management of the engine is less than the limit of the counting number C1 within a period of time t 1; and entering an engine load management mode if and only if the first judgment module, the second judgment module, the third judgment module and the fourth judgment module are enabled simultaneously.
In a preferred embodiment of the invention, K0, V0, M1, P0, t0, t1, C1 are calibrated by tests.
In a preferred embodiment of the present invention, the method for controlling the load in stages based on the deviation value between the driver's demanded torque and the actual torque comprises:
when the difference value between the driver required torque and the actual torque is equal to zero, the actual torque of the engine meets the driver required torque, and no load reduction measure is taken;
when the difference value between the driver demand torque and the actual torque is larger than zero and smaller than or equal to a certain value T1, the engine load management identification module is not strong, and only the target voltage of the generator is reduced;
when the difference value between the driver demand torque and the actual torque is larger than T1 and is smaller than or equal to T2, the engine load management identification module is strong, and only the air conditioner compressor load is disconnected;
when the difference between the driver demand torque and the actual torque is larger than T2, the engine load management identification module is strongest, and the target voltage of the generator and the load of the air conditioner compressor are reduced.
In a preferred embodiment of the present invention, the method for controlling the load of the air conditioner compressor based on the maximum time for the load of the air conditioner compressor to be disconnected comprises:
the load of an air conditioner compressor is disconnected, the real-time environment temperature of the vehicle and the temperature of an evaporating dish are detected, and the real-time temperature difference of the vehicle is obtained; and inquiring in a pre-stored corresponding relation between the representation temperature difference and the allowed disconnection time of the load according to the real-time temperature difference of the vehicle to obtain the maximum time limit of the disconnection of the load under the current scene, and outputting the maximum time limit of the disconnection of the load.
In a preferred embodiment of the present invention, the maximum time for the load disconnection of the air conditioning compressor is obtained based on a look-up table of the ambient temperature and the temperature of the evaporating dish of the air conditioning system.
The invention also discloses a graded management system of the electric load of the engine, which comprises a signal processing module, an engine load management module and a graded management execution module of the load, wherein the engine load management module comprises an engine load management identification module and a load disconnection time limiting module used for controlling the disconnection time of the air conditioner compressor.
In a preferred embodiment of the present invention, the signal processing module is capable of acquiring an evaporating dish temperature signal, an ambient temperature signal, an engine speed signal, a vehicle speed signal, an accelerator pedal signal, a driver demand torque signal and a driver actual torque signal of the air conditioning system.
In a preferred embodiment of the present invention, the load classification management execution module includes a load classification control module, an air conditioner clutch off-time limit module, and a generator voltage management module.
The invention has the beneficial effects that: the invention identifies the engine load management identification module through the engine load management identification module, timely disconnects or reduces partial high-power load, and uses the increased engine output torque for driving the vehicle to run, thereby effectively improving the dynamic property of the whole vehicle; furthermore, the invention can effectively control the off time of high-power loads such as an air conditioner compressor and the like through the load off time limiting module, and avoid the problems of high cabin temperature and the like caused by long-time off of the high-power loads such as the air conditioner compressor and the like, thereby optimizing the comfort of a driver; furthermore, the method can judge the used load mode and the allowable disconnection time of the idle-withering load in the current scene according to the acceleration judgment result of the driver in the current scene and based on the deviation value of the required torque and the actual torque of the driver, and carry out hierarchical control on the air conditioner compressor and the target voltage of the generator, thereby balancing the dynamic property and the comfort of the whole vehicle.
Drawings
FIG. 1 is a graph of the calculated relationship of various parameters in a virtual algorithm for oxygen quality of a diesel engine according to an embodiment of the present invention;
FIG. 2 is a flowchart of an algorithm of a virtual algorithm for oxygen quality of a diesel engine according to an embodiment of the present invention;
fig. 3 is a flowchart of another algorithm of the virtual algorithm for oxygen quality of the diesel engine according to the embodiment of the present invention.
Detailed Description
The technical solutions (including the preferred technical solutions) of the present invention are further described in detail by the figures and by way of listing some optional embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention discloses a grading management method for an engine power load, which is characterized in that when the engine power load works, whether an engine load management mode is entered or not is judged based on an engine load management identification module; reducing the target voltage of the generator and/or disconnecting the load of the air conditioner compressor based on the deviation value of the driver required torque and the actual torque; and controlling the off-time of the load of the air conditioner compressor based on the maximum off-time limit of the load of the air conditioner compressor.
In a preferred embodiment of the present invention, the engine load management identification module comprises: step one, collecting the opening degree of an accelerator pedal of a vehicle, the speed of the vehicle, the rotating speed of an engine, the torque of an engine clutch and the pressure value of an atmospheric pressure sensor, and inputting the pressure values into an engine load management identification module, wherein the engine load management identification module comprises four judgment modules; and step two, judging whether to enter an engine load management mode or not based on output results of the four judging modules.
In a preferred embodiment of the present invention, the enabling conditions of the first determining module are: the accelerator pedal opening is greater than the opening limit K0, and the vehicle speed is greater than the limit V0, it is considered that condition 1 is satisfied; the enabling conditions of the second judging module are as follows: the engine clutch torque is larger than or equal to the maximum output torque M1 of the engine under the current working condition, or the vehicle is in a starting assisting stage and the ambient pressure is lower than the pressure P0; the enabling conditions of the third judging module are as follows: when the engine is in a starting or repeated starting condition, the delay time exceeds t 0; the enabling conditions of the fourth judging module are as follows: after the engine is started, the number of times of entering load management of the engine is less than the limit of the counting number C1 within a period of time t 1; and entering an engine load management mode if and only if the first judging module, the second judging module, the third judging module and the fourth judging module are enabled simultaneously.
In a preferred embodiment of the invention, K0, V0, M1, P0, t0, t1, C1 are calibrated by tests.
In a preferred embodiment of the present invention, the method for controlling the load in stages based on the deviation value between the driver's demanded torque and the actual torque comprises:
when the difference value between the driver required torque and the actual torque is equal to zero, the actual torque of the engine meets the driver required torque, and no load reduction measure is taken;
when the difference value between the driver demand torque and the actual torque is larger than zero and smaller than or equal to a certain value T1, the engine load management identification module is not strong, and only the target voltage of the generator is reduced;
when the difference value between the driver demand torque and the actual torque is greater than T1 and less than or equal to T2, the engine load management identification module is strong, and only the air conditioner compressor load is disconnected;
when the difference between the driver demand torque and the actual torque is larger than T2, the engine load management identification module is strongest, and the target voltage of the generator and the load of the air conditioner compressor are reduced.
In a preferred embodiment of the present invention, the method for controlling the load of the air conditioner compressor based on the maximum time for the load of the air conditioner compressor to be disconnected comprises:
the load of an air conditioner compressor is disconnected, the real-time environment temperature of the vehicle and the temperature of an evaporating dish are detected, and the real-time temperature difference of the vehicle is obtained; and inquiring in a pre-stored corresponding relation between the representation temperature difference and the allowed disconnection time of the load according to the real-time temperature difference of the vehicle to obtain the maximum time limit of the disconnection of the load under the current scene, and outputting the maximum time limit of the disconnection of the load.
In a preferred embodiment of the present invention, the maximum time for the load disconnection of the air conditioning compressor is obtained based on a look-up table of the ambient temperature and the temperature of the evaporating dish of the air conditioning system.
The invention also discloses a graded management system of the power utilization load of the engine, which comprises a signal processing module, an engine load management module and a load graded management execution module, wherein the engine load management module comprises an engine load management identification module and a load disconnection time limiting module.
In a preferred embodiment of the present invention, the signal processing module is capable of acquiring an evaporating dish temperature signal, an ambient temperature signal, an engine speed signal, a vehicle speed signal, an accelerator pedal signal, a driver demand torque signal and a driver actual torque signal of the air conditioning system.
In a preferred embodiment of the present invention, the load classification management execution module includes a load classification control module, an air conditioner clutch off-time limit module, and a generator voltage management module.
The patent designs and optimizes through a control strategy,
1. an engine load management and identification module based on vehicle speed, engine rotating speed and accelerator pedal signals is designed, the engine load management and identification module is used for identifying the engine load management and identification module, timely disconnecting or reducing part of electric appliance load, and using the increased engine output torque to drive the vehicle to run so as to improve the dynamic property of the whole vehicle;
2. the load off-time limiting module based on the temperature difference between the ambient temperature and the evaporating dish of the air conditioning system is designed, the off-time of high-power loads such as an air conditioner compressor can be effectively controlled through the load off-time limiting module, the problems of high cabin temperature and the like caused by long-time disconnection of the high-power loads such as the air conditioner compressor and the like are avoided, the comfort of a driver is optimized,
3. a load grading control method based on the torque required by a driver and the actual torque is designed, and the dynamic property and the comfort of the whole vehicle are balanced.
The invention is further explained below with reference to an embodiment of the drawing:
the system consists of a signal identification module, an engine load management identification module, a load disconnection time limiting module, a brake safety identification module and a load management execution module, and specifically comprises the following steps:
1. acquiring signals such as vehicle speed, engine speed, an accelerator pedal, atmospheric pressure and the like through a signal identification module;
2. acquiring the opening degree of an accelerator pedal, the speed of the vehicle, the rotating speed of an engine, the torque of a clutch of the engine and the pressure value of an atmospheric pressure sensor of the vehicle in real time;
the method comprises the steps that the opening degree of an accelerator pedal, the speed of a vehicle, the rotating speed of an engine, the torque of a clutch of the engine and the pressure value of an atmospheric pressure sensor which are acquired in real time are input into an engine load management identification module;
the engine load management identification module is divided into four judgment modules, and whether the engine load management module is entered is judged according to the output result of the engine load management identification module, and the judgment module specifically comprises the following steps:
a first judging module:
condition 1: the opening degree of the accelerator pedal is larger than the opening degree limit K 0 And the vehicle speed is greater than the limit V 0 Considering that the condition 1 is satisfied, when the accelerator opening is smaller than the opening limit K 1 Or the vehicle speed is less than V 0 When condition 1 is not satisfied, the limit value K 0 Greater than K 1 ；
Condition 2: gearbox creep torque is greater than torque limit M 0 When, condition 2 is considered to be satisfied;
condition 3: judging that the vehicle is in a starting assisting stage, and considering that the condition 3 is met
If one of the conditions 1, 2 and 3 is satisfied, it can be considered that the first judgment module is enabled
A second judging module:
condition 4: (1) the torque of the engine clutch is more than or equal to the maximum output torque M of the engine under the current working condition 1 Condition 3 is considered to be satisfied;
condition 5: (2) the vehicle is in a starting assisting stage and the environment pressure is lower than the pressure P 0 When both are satisfied, condition 5 is considered to be satisfied, and when the ambient pressure is higher than pressure P 1 When the condition 5 is not satisfied;
the condition 4 and the condition 5 meet one of the conditions, and the judgment module II is considered to be enabled
A third judging module: condition 6: when the engine is in a starting or repeated starting working condition, delaying for a certain time t 0 Over time t 0 Then, the judgment module III is considered to be enabled;
and a fourth judging module: condition 7: after the engine is started, the engine is at a time t 1 In the method, the number of times of entering load management is less than the counting number C 1 Limiting, consider the decision module four enabled, if at time t 1 The number of times of internal access load management exceeds C 1 Subsequent times will not enter load management;
when the judgment modules I, II, III and IV are simultaneously satisfied, the engine load management mode can be entered;
the calibration parameters are as follows: k 0、 V 0、 M 1、 P 0、 t 0、 t 1、 C 1 Can be adjusted by calibration.
The design idea of the above 4 judgment modules is as follows:
a first judging module:
condition 1: actually, in the starting process, an accelerator pedal and the vehicle speed are used for judging whether the load is cut off or not; (MT/AT/DCT type)
Condition 2: cutting off the load in the crawling stage; (automatic transmission type AT/DCT)
Condition 3: the vehicle starting auxiliary stage cuts off the load; (MT vehicle type)
The above 3 conditions satisfy one of the enabling, multi-vehicle type coverage.
And a second judging module:
condition 4: when the requested torque has substantially reached the maximum engine output capacity, it is also necessary to cut off the load at this time;
condition 5: the output power of the engine on the plateau is limited, and the output torque is limited before the small-displacement engine enters the supercharging, so the strategy is designed in the starting process;
the 2 conditions mentioned above satisfy one of the enables.
A third judging module: during starting, the engine is not in a steady state operation, so a time delay needs to be added.
And a judgment module IV: designed to prevent frequent load shedding within a period of time, the number of load entries in time t1 exceeds C1, and the load is not shed at time t 1.
The technical problem to be solved by the design is as follows: the problems that a small-displacement vehicle cannot be started or is difficult to start under extreme working conditions, such as high-altitude vehicles, or the acceleration performance is poor before the vehicle enters pressurization control, and the like, are solved, and the dynamic property of the whole vehicle is optimized;
the technical effect brought by the design is as follows: the load is reasonably cut off by considering the conditions of altitude, starting working condition, rapid acceleration working condition and the like, the load is saved, and the load can be about 10-20Nm to drive the vehicle.
3. Based on the load disconnection time limiting module, the maximum disconnection time of the air conditioner compressor is limited to balance the influence on the internal environment temperature of the cabin, and the air conditioner refrigeration requirement meets the requirement of a driver;
the method specifically comprises the following steps: when the system enters the engine load management identification module, the output result of the engine load management identification module indicates that the driver has an intention to accelerate, at the moment, the air-conditioning compressor is controlled to be disconnected in load, the real-time environment temperature of the vehicle and the temperature of the evaporation pan are detected, the real-time temperature difference of the vehicle is obtained, then the query is carried out in the corresponding relation between the pre-stored characterization temperature difference and the load allowable disconnection time according to the real-time temperature difference of the vehicle, the maximum load disconnection time limit under the current scene is obtained, and the maximum load disconnection time limit is output. The corresponding relationship between the temperature difference and the allowable load disconnection time can be obtained through relevant data obtained through tests, as shown in fig. 2, after the load of the air conditioner compressor is disconnected, the temperature T1 of the evaporating dish of the air conditioning system gradually rises, and the temperature difference between the ambient temperature signal T2 and the temperature signal T1 of the evaporating dish of the air conditioning system gradually rises, which means that the required disconnection time should be reduced along with the increase of the temperature difference.
4. And the load grading management execution module is used for judging an applicable load management mode according to a deviation value of the torque required by the driver and the actual torque after the engine load management identification module is enabled, and as shown in fig. 3, the specific load grading control method comprises the following steps:
when the difference value between the driver required torque and the actual torque is equal to zero, the actual torque of the engine is considered to meet the driver required torque, and no load reduction measure is needed;
when the difference value between the driver required torque and the actual torque is larger than zero and smaller than or equal to a certain value T1, the engine load management identification module is considered to be weak, and the driver required torque can be met only by reducing the target voltage of the generator;
when the difference value between the driver required torque and the actual torque is greater than T1 and less than or equal to T2, the engine load management identification module is considered to be strong, and the driver required torque can be met only by disconnecting the load of the air conditioner compressor;
when the difference between the driver required torque and the actual torque is larger than T2, the engine load management identification module is considered to be the strongest, and the target voltage of the generator and the load of the air conditioner compressor need to be reduced simultaneously to meet the driver required torque. The torque deviations T1, T2, T3 may be adjusted by calibration.
The main purpose of the limiting module is to limit the disconnection time of the air conditioner clutch, and the specific limiting module control method is as follows:
the maximum value of the limiting module is based on the environmental temperature and the temperature of an evaporating dish of the air conditioning system, a limiting time is obtained, the minimum value is zero, the minimum value is d1, the minimum air conditioning off-time can be limited through calibration and adjustment, and the influence of frequent suction and off of the air conditioner on a client can be effectively avoided;
the main objective of generator voltage management is to control the output voltage of the generator, and the specific control method is as follows:
when the load grading control activates the generator voltage management module, the generator target voltage U1 is output, and when the load grading does not activate the generator voltage management module, the generator target voltage U2 is output; the generator target voltage U1 is smaller than U2, so that the charging load of the generator is reduced, and the voltage values U1 and U2 can be adjusted through calibration.
And controlling the load running condition of the vehicle according to the allowable disconnection time of the load of the idle withering process in the current scene and the acceleration judgment result of the driver in the current scene.
Taking a vehicle type carrying an intelligent generator and an air-conditioning compressor as an example, the vehicle is positioned on a 65KPa plateau, and the vehicle is subjected to an original-place starting test: when the vehicle speed creep torque is larger than the torque limit value M 1 (e.g., 10Nm), ambient pressure lower than pressure P 0 (e.g., 65Kpa) and the engine operating duration is greater than t 0 (e.g., 5s), time t 1 (e.g. 60s) number of in-coming loads exceeding C 1 (5 times), when the conditions are met simultaneously, the engine load management identification module is considered to be enabled, when the system identifies that the difference value between the driver required torque and the actual torque is equal to zero, the system does not disconnect the air conditioner compressor and reduce the target voltage of the generator, when the system identifies that the difference value between the driver required torque and the actual torque is larger than zero and smaller than T1 (such as 7NM), the deviation between the required torque and the actual torque is not large, and the driver required torque can be met by reducing the target voltage of the generator; when the system identifies that the difference between the driver required torque and the actual torque is greater than T1 and less than T2 (e.g., 15NM), the deviation between the required torque and the actual torque is large, and the driver required torque can be met by disconnecting the air conditioner compressor load; when the system identifies that the difference between the driver required torque and the actual torque is greater than T2(15NM), the deviation between the required torque and the actual torque is large, and the load of the air conditioner compressor and the target voltage of the generator need to be simultaneously disconnected by singly disconnecting the load of the air conditioner compressor or reducing the target voltage of the generator, which is not enough to meet the torque requirement of the driver;
in the process of executing the air conditioner load disconnection, the maximum disconnection time of the air conditioner load is limited, the comfort of a client is met, for example, after an engine load management identification module is met, the load is controlled in a grading mode, when a system identifies that the difference value between the required torque and the actual torque of a driver is larger than T2(15NM), the air conditioner compressor is disconnected and the target voltage of a generator is reduced at the same time, and when the disconnection time of the air conditioner compressor meets the time limit of the load disconnection time limit module or the engine load management identification module is not enabled, the air conditioner clutch is re-attracted, so that the comfort of the whole vehicle is improved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and any modification, combination, replacement, or improvement made within the spirit and principle of the present invention is included in the scope of the present invention.

Claims (8)

1. A grading management method for an electric load of an engine is characterized by comprising the following steps: when the engine power utilization load works, judging whether to enter an engine load management mode or not based on an engine load management identification module; reducing the target voltage of the generator and/or disconnecting the load of the air conditioner compressor based on the deviation value of the driver required torque and the actual torque; controlling the off-time of the air conditioner compressor load based on the maximum time limit for the air conditioner compressor load to be off; acquiring the opening degree of an accelerator pedal of a vehicle, the speed of the vehicle, the rotating speed of an engine, the torque of an engine clutch and the pressure value of an atmospheric pressure sensor, and inputting the pressure value into an engine load management and identification module, wherein the engine load management and identification module comprises four judgment modules; step two, judging whether to enter an engine load management mode or not based on output results of the four judging modules;
the enabling condition of the first judging module is as follows: the accelerator pedal opening is greater than the opening limit K0, and the vehicle speed is greater than the limit V0;
the enabling conditions of the second judging module are as follows: the engine clutch torque is larger than or equal to the maximum output torque M1 of the engine under the current working condition, or the vehicle is in a starting assisting stage and the environmental pressure is lower than the pressure P0;
the enabling conditions of the third judging module are as follows: when the engine is in a starting or repeated starting condition, the delay time exceeds t 0;
the enabling condition of the fourth judging module is as follows: after the engine is started, the number of times of entering load management of the engine is less than the limit of the counting number C1 within a period of time t 1;
and entering an engine load management mode if and only if the first judgment module, the second judgment module, the third judgment module and the fourth judgment module are enabled simultaneously.
2. The hierarchical management method of electrical loads for engines according to claim 1, characterized in that: k0, V0, M1, P0, t0, t1 and C1 are calibrated by tests.
3. The hierarchical management method of electrical loads for engines according to claim 1, characterized in that: the method for controlling the load in a grading manner based on the deviation value of the required torque and the actual torque of the driver comprises the following steps:
when the difference value between the driver required torque and the actual torque is equal to zero, the actual torque of the engine meets the driver required torque, and no load reduction measure is taken;
when the difference value between the driver required torque and the actual torque is larger than zero and smaller than or equal to a certain value T1, the engine load management identification module is not strong, and only the target voltage of the generator is reduced;
when the difference value between the driver demand torque and the actual torque is greater than T1 and less than or equal to T2, the engine load management identification module is strong, and only the air conditioner compressor load is disconnected;
when the difference between the driver required torque and the actual torque is larger than T2, the engine load management identification module is strongest, and the target voltage of the generator and the load of the air conditioner compressor are reduced.
4. The hierarchical management method of electrical loads for engines according to claim 1, characterized in that: the method for controlling the load of the air conditioner compressor based on the maximum time of the load disconnection of the air conditioner compressor comprises the following steps:
the load of an air conditioner compressor is disconnected, the real-time environment temperature of the vehicle and the temperature of an evaporating dish are detected, and the real-time temperature difference of the vehicle is obtained; and inquiring in a pre-stored corresponding relation between the representation temperature difference and the allowed disconnection time of the load according to the real-time temperature difference of the vehicle to obtain the maximum time limit of the disconnection of the load under the current scene, and outputting the maximum time limit of the disconnection of the load.
5. The method for managing in stages an electrical load for an engine according to claim 4, characterized in that: the maximum time of the load disconnection of the air conditioner compressor is obtained by table lookup based on the ambient temperature and the temperature of an evaporating dish of the air conditioning system.
6. The utility model provides a hierarchical management system of engine power consumption load, includes signal processing module, engine load management module and the hierarchical management execution module of load, its characterized in that: the engine load management module comprises an engine load management identification module and a load disconnection time limiting module used for controlling disconnection time of an air conditioner compressor;
the engine load management identification module comprises four judgment modules:
a first judging module:
condition 1: when the opening degree of the accelerator pedal is larger than the opening degree limit K0 and the vehicle speed is larger than the limit V0, the condition 1 is considered to be satisfied, and when the opening degree of the accelerator is smaller than the opening degree limit K1 or the vehicle speed is smaller than V0, the condition 1 is considered to be not satisfied, and the limit value K0 is larger than K1;
condition 2: when the transmission creep torque is greater than the torque limit M0, condition 2 is considered to be satisfied;
condition 3: judging that the vehicle is in a starting assisting stage, and considering that the condition 3 is met;
if the condition 1, the condition 2 and the condition 3 satisfy one of the conditions, the judgment module one is enabled;
a second judging module:
condition 4: the torque of the engine clutch is larger than or equal to the maximum output torque M1 of the engine under the current working condition, and the condition 4 is considered to be met;
condition 5: when the vehicle is in a starting assisting stage, the ambient pressure is lower than the pressure P0, the condition 5 is considered to be met when the ambient pressure and the pressure are met simultaneously, and the condition 5 cannot be met when the ambient pressure is higher than the pressure P1;
if the condition 4 and the condition 5 meet one of the conditions, the judgment module II is enabled;
a third judging module:
condition 6: when the engine is in a starting or repeated starting working condition, delaying for a certain time t0, and after the time t0 is exceeded, considering that the judgment module III is enabled;
and a judgment module IV:
condition 7: after the engine is started, the number of times of entering load management of the engine within a period of time t1 is less than the limit of the counting number of times C1, the judgment module IV is considered to be enabled, and if the number of times of entering load management within the time t1 exceeds C1, the load management will not be entered at the subsequent time;
when the judgment modules I, II, III and IV are simultaneously satisfied, the engine load management mode is considered to be entered; the calibration parameters are as follows: k0, V0, M1, P0, t0, t1 and C1 are all adjusted by calibration.
7. The hierarchical management system for electrical loads for engines according to claim 6, characterized in that: the signal processing module can acquire an evaporating dish temperature signal, an environment temperature signal, an engine rotating speed signal, a vehicle speed signal, an accelerator pedal signal, a driver demand torque signal and a driver actual torque signal of the air conditioning system.
8. The hierarchical management system for electrical loads for engines according to claim 6, characterized in that: the load grading management execution module comprises a load grading control module, an air conditioner clutch disconnection time limiting module and a generator voltage management module, wherein when the generator voltage management module is activated by load grading control, a generator target voltage U1 is output, and when the generator voltage management module is not activated by the load grading control, a generator target voltage U2 is output; the generator target voltage U1 is smaller than U2, so that the charging load of the generator is reduced, and the voltage values U1 and U2 can be adjusted through calibration.
CN202011241070.8A 2020-11-09 2020-11-09 Method and system for graded management of electric load of engine Active CN112428789B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011241070.8A CN112428789B (en) 2020-11-09 2020-11-09 Method and system for graded management of electric load of engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011241070.8A CN112428789B (en) 2020-11-09 2020-11-09 Method and system for graded management of electric load of engine

Publications (2)

Publication Number Publication Date
CN112428789A CN112428789A (en) 2021-03-02
CN112428789B true CN112428789B (en) 2022-08-30

Family

ID=74701204

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011241070.8A Active CN112428789B (en) 2020-11-09 2020-11-09 Method and system for graded management of electric load of engine

Country Status (1)

Country Link
CN (1) CN112428789B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113665499A (en) * 2021-08-31 2021-11-19 中国第一汽车股份有限公司 Electric automobile energy management system and control method
CN114566027B (en) * 2022-01-25 2024-04-26 徐州徐工挖掘机械有限公司 Low-load early warning method and system and hydraulic excavator
CN114670676A (en) * 2022-03-31 2022-06-28 江铃汽车股份有限公司 Vehicle torque control method, system, terminal device and storage medium
CN115257667B (en) * 2022-08-22 2023-07-25 东风柳州汽车有限公司 Auxiliary braking hierarchical control method and system for heavy trucks in new energy

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1986304A (en) * 2006-12-08 2007-06-27 奇瑞汽车有限公司 Mixed power automobile controlling method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3855571B2 (en) * 1999-12-24 2006-12-13 株式会社豊田自動織機 Output control method for internal combustion engine
CN104085397B (en) * 2013-12-31 2016-08-31 浙江吉利控股集团有限公司 The control method that air-conditioning acceleration is unable opened by a kind of 1.5L electromotor that solves
CN110217234B (en) * 2019-06-26 2021-08-31 奇瑞汽车股份有限公司 Control method and device for power output of engine
CN110341693A (en) * 2019-07-08 2019-10-18 高晓杰 Bi-motor increases journey driving hybrid vehicle series model access method and system
CN111806423B (en) * 2020-06-09 2022-06-28 联合汽车电子有限公司 Method for reducing engine load and readable storage medium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1986304A (en) * 2006-12-08 2007-06-27 奇瑞汽车有限公司 Mixed power automobile controlling method

Also Published As

Publication number Publication date
CN112428789A (en) 2021-03-02

Similar Documents

Publication Publication Date Title
CN112428789B (en) Method and system for graded management of electric load of engine
US7295915B1 (en) Method for compensating for accessory loading
CN102506021B (en) Control device and method for air-conditioning compressor of low-displacement automobile
CN111016874B (en) Torque distribution method and torque distribution device for hybrid electric vehicle
CN112224035B (en) Driving torque optimization control method for pure electric vehicle
CN111608786B (en) Method for calibrating fan of electric control silicone oil clutch of heavy-duty car
CN111942367A (en) Method for torque distribution of a powertrain of a hybrid vehicle
CN103806998B (en) The energy management system and method for the dynamical system of the vehicles
CN111520262B (en) Control method of air intake system and vehicle
US7019414B2 (en) Alternator load control to extend displacement on demand range
US11752996B2 (en) System and method for controlling power consumption of high voltage battery
CN112977396A (en) Hybrid electric vehicle power generation torque distribution method and hybrid electric vehicle
CN110469664A (en) A kind of stepless transmission speed ratio control method and system
CN110962855A (en) Torque control system and method for extended range automobile engine
JP2005180255A (en) Power train control device provided with electric supercharger
KR20140063199A (en) System for damper clutch controlling of automatic transmission vehicle and method thereof
CN211808946U (en) Auxiliary supercharging automobile air conditioning system
CN110978958A (en) Auxiliary supercharging automobile air conditioning system
US6830532B1 (en) Method for controlling a powertrain having multiple torque sources
US7863843B2 (en) Cold rattle reduction control system
US20200353927A1 (en) Vehicle transmission system and a method thereof
Yang et al. The Research on the Subjective and Objective Drivability Evaluation and Analysis of PHEV Passenger Car
CN111890947B (en) Brake control method of pure electric vehicle in automatic driving mode
CN115370492A (en) Control method and device of variable valve timing system and automobile
CN113815408B (en) Dynamic energy recovery method for engine

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant