CN113404598B - Engine control method, engine control device and readable storage medium - Google Patents
Engine control method, engine control device and readable storage medium Download PDFInfo
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- CN113404598B CN113404598B CN202010184322.1A CN202010184322A CN113404598B CN 113404598 B CN113404598 B CN 113404598B CN 202010184322 A CN202010184322 A CN 202010184322A CN 113404598 B CN113404598 B CN 113404598B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/503—Battery correction, i.e. corrections as a function of the state of the battery, its output or its type
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- Combustion & Propulsion (AREA)
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- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
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Abstract
The invention relates to the technical field of automobile clutch control, and discloses a control method, a control device and a readable storage medium of an engine, wherein the control method comprises the following steps: when the engine is in an idling state, judging whether to activate engine idling hierarchical calculation or not according to the electric quantity of the storage battery and the load of the generator; if the judgment result is activation, acquiring the discharge current of the storage battery, and determining a first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals so as to determine a first electric load grade corresponding to the first current interval; and calculating the target rotating speed in the idle state of the engine corresponding to the first electric load grade according to the first electric load grade, the generator characteristic and the generator speed ratio so that the engine can adjust the current rotating speed to the target rotating speed in the idle state of the engine. The idle speed control system can accurately identify the state of the electrical load and accurately adjust the idle speed of the engine according to the state of the electrical load so as to effectively match the electrical load.
Description
Technical Field
The invention relates to the technical field of automobile engine speed control, in particular to a control method, a control device and a readable storage medium of an engine.
Background
The idling working condition of the automobile refers to the working state of the engine during idling, and the idling rotating speed of the engine is usually lower under the idling working condition in consideration of controlling oil consumption, emission and the like. The engine of the automobile is in transmission connection with the generator, the engine can drive the generator to work, the rotating speed and the generating efficiency of the generator are positively correlated with the rotating speed of the engine, and the generator supplies power to the vehicle-mounted electric equipment of the automobile or stores the generated electric energy in the vehicle-mounted storage battery. Under the idle operating mode, because the rotational speed of engine is lower, the generating efficiency of generator also is in lower level, if there is great power consumption load this moment, for example car air conditioner, headlight, defroster, seat and wind window heating etc. are opened, just can surpass the output of generator, need supply power by the supplementary power supply of on-vehicle battery discharge, but if the battery electric quantity is continued a large amount of consumptions, can lead to insufficient electricity, influence battery electric quantity life. Therefore, the idle speed of the engine needs to be controlled to be adjusted so as to better adapt to the electricity utilization load under the idle working condition. However, the idle speed of the engine is often raised to a small extent only according to one of the factors such as the power generation voltage of the generator, the available electric quantity of the storage battery, whether the high-power electric equipment is turned on, and the like, and the engine speed is not controlled in a grading manner according to different power load states.
Disclosure of Invention
The invention aims to provide a control method, a control device and a readable storage medium of an engine, which can accurately identify the state of an electric load and accurately adjust the idle speed of the engine according to the state of the electric load so as to effectively match the electric load.
In order to achieve the above object, the present invention provides a control method of an engine, comprising the steps of:
when the engine is in an idling state, judging whether to activate the engine idling hierarchical calculation according to the electric quantity of the storage battery and the load of the generator;
if the judgment result is activation, acquiring the discharge current of the storage battery, and determining a first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals so as to determine a first electric load grade corresponding to the first current interval; each current interval is provided with a corresponding electric load grade;
and calculating a target rotating speed in an engine idling state corresponding to the first electric load grade according to the first electric load grade, the generator characteristic and the generator speed ratio, so that the engine adjusts the current rotating speed to the target rotating speed in the engine idling state.
Preferably, the step of determining whether to activate the engine idle classification calculation according to the battery capacity and the generator load in the idle state of the engine comprises:
when the engine is in an idling state, acquiring the electric quantity of a storage battery and the load of a generator, and acquiring a set electric quantity threshold value and a set load threshold value;
judging whether the electric quantity of the storage battery is smaller than the electric quantity threshold value or not, and judging whether the load of the generator is larger than the load threshold value or not;
and if the electric quantity of the storage battery is smaller than the electric quantity threshold value and the load of the generator is larger than a load threshold value, activating engine idling classification calculation.
Preferably, the step of calculating a target rotation speed in an engine idle state corresponding to the current power load level according to the current power load level, the generator characteristic and the generator speed ratio, so that the engine adjusts the current rotation speed to the target rotation speed in the engine idle state further includes:
acquiring the ambient temperature or the water temperature in a water tank or the temperature of a generator or the temperature of a storage battery, and correcting the target rotating speed of the engine in an idling state according to the acquired temperature value;
or determining the resonance point rotating speed when the resonance of the engine and the subframe modal occurs, and correcting the target rotating speed of the engine in the idle state according to the resonance point rotating speed.
Preferably, the step of acquiring an ambient temperature or a water temperature in a water tank or a generator temperature or a battery temperature, and correcting the target rotation speed of the engine in an idle state according to the acquired temperature value includes:
acquiring the ambient temperature or the water temperature in a water tank or the temperature of a generator or the temperature of a storage battery, and acquiring a plurality of preset temperature intervals, wherein each temperature interval corresponds to a correction rotating speed;
determining a preset temperature interval in which the obtained temperature value falls, and adding the target rotating speed in the idle state of the engine and the corrected rotating speed to obtain a new target rotating speed in the idle state of the engine;
the step of correcting the target rotating speed of the engine in the idle state according to the rotating speed of the resonance point comprises the following steps:
and comparing the rotating speed of the resonance point with the target rotating speed in the new engine idling state, and if the rotating speed of the resonance point is consistent with the target rotating speed in the new engine idling state, adjusting the target rotating speed in the engine idling state to avoid the rotating speed of the resonance point.
Preferably, before the step of determining whether to activate the engine idle speed classification calculation according to the battery charge and the generator load in the idle state of the engine, the method further comprises the following steps:
detecting whether the engine is in an idling working condition, and if so, detecting whether the state of the storage battery and the state of the engine are normal;
if the storage battery state and the engine state are both normal, judging that the storage battery state and the engine state are in an engine idling state;
otherwise, it is determined that the engine is not in the idle state.
Preferably, the step of detecting whether the engine is in an idle condition comprises:
acquiring the current rotating speed of the engine;
comparing whether the current rotating speed of the engine is greater than a rotating speed threshold value, and if so, judging whether the opening of an accelerator pedal is greater than 0;
if the opening degree of the accelerator pedal is larger than 0, judging whether the automobile gear is in a P gear or an N gear;
and if the automobile gear is in the P gear or the N gear, judging that the automobile gear is in the idling working condition.
The present invention also provides a control device of an engine, including: the device comprises a hierarchical calculation activation judgment module, a load grade determination module, a rotating speed calculation module and an engine rotating speed adjustment module;
the hierarchical calculation activation judging module is used for judging whether to activate the hierarchical calculation of the idle speed of the engine according to the electric quantity of the storage battery and the load of the generator when the engine is in the idle speed state;
the load grade determining module is used for acquiring the discharge current of the storage battery when the judgment result of the activation judging module is yes, and determining a first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals so as to determine a first electric load grade corresponding to the first current interval; each current interval is provided with a corresponding electric load grade;
the rotating speed calculation module is used for calculating a target rotating speed in an engine idling state corresponding to the first electric load grade according to the current electric load grade, the generator characteristic and the generator speed ratio;
the engine rotating speed adjusting module is used for adjusting the current rotating speed of the engine to the target rotating speed of the engine in the idling state.
As a preferred scheme, the hierarchical computation activation judgment module comprises a first acquisition unit, a first judgment unit, a second acquisition unit and a second judgment unit;
the first acquisition unit is used for acquiring the electric quantity of the storage battery;
the first judging unit is used for judging whether the electric quantity of the storage battery is smaller than an electric quantity threshold value;
the second acquisition unit is used for acquiring the load of the generator;
and the second judging unit is used for judging whether the load of the generator is greater than a load threshold value or not and sending a signal for activating the engine idling classification calculation when the judgment result is yes.
Preferably, the control device further includes a correction module configured to correct the target rotation speed in the engine idle state.
Preferably, the correction module comprises a first detection unit, a first storage unit, a first correction unit, a second storage unit and a second correction unit;
the first detection unit is used for detecting the ambient temperature or the water temperature in the water tank or the temperature of the generator or the temperature of the storage battery;
the first storage unit is used for storing a plurality of preset temperature intervals and corresponding correction rotating speeds;
the first correction unit is used for determining a preset temperature interval in which the temperature value acquired by the first detection unit falls, and adding the target rotating speed in the idle state of the engine and the correction rotating speed to obtain a new target rotating speed in the idle state of the engine;
the second storage unit is used for storing the rotating speed of the resonance point;
the second correction unit is used for comparing whether the rotating speed of the resonance point is consistent with the target rotating speed in the new idling state of the engine or not, and if so, adjusting the target rotating speed in the idling state of the engine to avoid the rotating speed of the resonance point.
Preferably, the control device further comprises an idle state judgment module, wherein the idle state judgment module is used for judging whether the engine is in an idle state;
the idle state judgment module is further configured to:
acquiring the current rotating speed of an engine;
comparing whether the current rotating speed of the engine is greater than a rotating speed threshold value, and if so, judging whether the opening of an accelerator pedal is greater than 0;
if the opening degree of the accelerator pedal is larger than 0, judging whether the automobile gear is in a P gear or an N gear;
and if the automobile gear is in the P gear or the N gear, judging that the automobile gear is in the idling working condition.
The invention also provides a readable storage medium which comprises a stored computer program, wherein when the computer program runs, the device where the readable storage medium is located is controlled to execute the control method of the engine in any technical scheme.
Compared with the prior art, the invention has the beneficial effects that:
the control method of the engine comprises the steps of firstly obtaining the electric quantity of the storage battery and the load of the generator when the engine is in an idling state, determining whether to activate the idling calculation of the engine according to the electric quantity of the storage battery and the load of the generator, generally judging whether the electric quantity of the storage battery is low according to the electric quantity of the storage battery, judging whether the generator is in a full-load working state according to the load of the generator, if the electric quantity of the storage battery is sufficient or the load of the generator is low, increasing the idling speed of the engine is not needed, and judging that the idling calculation of the engine is not activated. If the electric quantity of the storage battery is low and the generator works at full load, the idling speed of the engine is possibly required to be increased at the moment, the judgment result is that the idling graded calculation of the engine is activated, the discharging current of the storage battery is obtained, a plurality of preset current intervals are set, the obtained discharging current of the storage battery is compared with the preset current intervals, a first current interval corresponding to the discharging current of the storage battery is determined, a first electric load corresponding to the first current interval is determined, namely the current electric load grade, the rotating speed required to be reached by the engine is calculated according to the first electric load grade, the characteristics of the generator and the speed ratio of the generator, the target rotating speed of the engine in the idling state can be obtained, and then the target rotating speed of the engine in the idling state is sent to the engine, so that the engine can adjust the current rotating speed to the target rotating speed of the engine in the idling state. Therefore, the power demand is comprehensively judged through the electric quantity of the storage battery, the load of the generator and the discharge current of the storage battery, whether the idling speed of the engine needs to be increased or not is determined, the idling speed of the engine is prevented from being increased when the idling speed of the engine is not necessary, the oil consumption is increased, the power shortage risk is prevented, and the method is more accurate and reasonable and meets the actual demand. According to different storage battery discharging currents, determining power load grades with different sizes, calculating according to the different power load grades, the characteristics of the generator and the speed ratio of the generator to obtain target rotating speeds of the engine in idle states with different sizes, adjusting the rotating speeds of the engine to different sizes according to different load working conditions in a targeted manner, enabling the engine to drive the generator to be better matched and adapted to the different power load working conditions, achieving accurate hierarchical control, avoiding the problems that the oil consumption is high due to the fact that the idle rotating speed of the engine is increased too much, and the generated energy of the generator cannot meet the power load requirements due to the fact that the idle rotating speed of the engine is increased insufficiently, and ensuring that the output of the generator and the power consumption of the whole vehicle are balanced.
The storage medium of the engine control device and the engine control method according to the present invention can realize the engine control method described above, and therefore, the same technical effects as those of the engine control device and the engine control method can be obtained.
Drawings
FIG. 1 is a schematic diagram of a method for controlling an engine according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a method of controlling an engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of step S2 and step S3 provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of step S33 provided by the embodiment of the present invention;
FIG. 5 is a schematic diagram of step S01 and step S02 provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a control apparatus provided in accordance with an embodiment of the present invention;
fig. 7 is a schematic diagram of another control device provided in the embodiment of the present invention.
10, a grading calculation activation judgment module; 11. a first acquisition unit; 12. a first determination unit; 13. a second acquisition unit; 14. a second determination unit; 20. a load level determination module; 30. a rotation speed calculation module; 31. a first calculation unit; 32. a second calculation unit; 40. an engine speed adjustment module; 50. a storage battery; 60. a generator; 70. an engine; 80. a correction module; 81. a first detection unit; 82. a first storage unit; 83. a first correcting unit; 84. a second storage unit; 85. a second correction unit; 90. an idle state judgment module; 91. a third acquisition unit; 92. a third determination unit; 93. a fourth acquisition unit; 94. a fourth determination unit; 95. a fifth obtaining unit; 96. a fifth judging unit; 97. a second detection unit; 98. and a third detection unit.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, a method for controlling an engine according to the present invention is schematically shown, including the steps of:
s1, judging whether to activate the engine idling classification calculation according to the electric quantity of a storage battery and the load of a generator when the engine is in an idling state;
s2, if the judgment result is activation, obtaining a storage battery discharging current I, and determining a first current interval corresponding to the storage battery discharging current from a plurality of preset current intervals so as to determine a first electric load grade corresponding to the first current interval; each current interval is provided with a corresponding electric load grade;
and S3, calculating a target rotating speed T in an engine idling state corresponding to the first electric load grade according to the first electric load grade, the generator characteristic and the generator speed ratio C, so that the engine adjusts the current rotating speed to the target rotating speed T in the engine idling state.
The first current interval is a current interval corresponding to the current discharging current of the storage battery, and the first electric load grade is the current electric load grade corresponding to the first current interval.
Specifically, in step S1, when the engine is in an idle state, it is determined whether to activate the engine idle step calculation process according to the battery capacity and the generator load, where it is mainly determined whether to activate the engine idle step calculation process according to the battery capacity and the generator load, and if the battery capacity is small, it indicates that the battery capacity is insufficient, otherwise, it indicates that the battery capacity is sufficient. If the load of the generator is close to the limit, the full load operation of the generator is indicated, otherwise, the full load operation of the generator is indicated. When the electric quantity of the storage battery is sufficient or the generator is not fully loaded, the idling speed of the engine does not need to be increased, and the idling graded calculation of the engine is not activated. When the electric quantity of the storage battery is insufficient and the generator runs at full load, activating the engine idling step calculation, continuing to execute the step S2, obtaining the discharging current I of the storage battery, setting a plurality of preset current intervals, setting a corresponding electric load grade in each current interval, determining a first current interval corresponding to the discharging current I of the storage battery, determining a first electric load grade corresponding to the first current interval, namely the current electric load grade, and calculating the target rotating speed of the engine in the idling state by combining the characteristics of the generator and the speed ratio C of the generator, wherein the characteristics of the generator in the step S3 refer to the relation between the electric load and the rotating speed of the generator, namely the electric load with specific size corresponds to the rotating speed of the generator with specific size, and the characteristics of the generator and the speed ratio C of the generator can be regarded as fixed for a certain generator.
According to the control method of the engine based on the technical characteristics, when the engine is in an idling state, the electric quantity of the storage battery and the load of the generator are firstly obtained, whether the idling calculation of the engine is activated or not is determined according to the electric quantity of the storage battery and the load of the generator, whether the electric quantity of the storage battery is low or not can be judged according to the electric quantity of the storage battery, whether the full-load working state of the generator is judged according to the load of the generator, if the electric quantity of the storage battery is sufficient or the load of the generator is low, the idling speed of the engine does not need to be increased, and the judgment result is that the idling calculation of the engine is not activated. If the electric quantity of the storage battery is low and the generator works at full load, the idling speed of the engine is possibly required to be increased at the moment, the judgment result is that the idling graded calculation of the engine is activated, the discharging current I of the storage battery is obtained, a plurality of preset current intervals are set, the obtained discharging current I of the storage battery is compared with the preset current intervals, a first current interval corresponding to the discharging current of the storage battery is determined, the first electric load corresponding to the first current interval is determined to be the current electric load grade, the rotating speed which the engine needs to reach is calculated according to the first electric load grade, the generator characteristic and the generator speed ratio C, the target rotating speed T in the idling state of the engine can be obtained, and then the target rotating speed T in the idling state of the engine is sent to the engine, so that the engine can adjust the current rotating speed to the target rotating speed T in the idling state of the engine. Therefore, the power demand is comprehensively judged through the storage battery electric quantity, the generator load and the storage battery discharging current I, whether the idling speed of the engine needs to be increased or not is determined, the idling speed of the engine is prevented from being increased when the idling speed of the engine is not necessary, the oil consumption is increased, the power shortage risk is prevented, and the method is more accurate and reasonable and meets the actual demand. According to different storage battery discharging currents I, determining power load grades of different sizes, calculating according to the different power load grades and the characteristics of a generator and the speed ratio C of the generator to obtain target rotating speeds T in idle states of the engines of different sizes, adjusting the rotating speeds of the engines to different sizes according to different load working conditions in a targeted mode, enabling the engines to drive the generator to be better matched and adapted to different power load working conditions, achieving accurate hierarchical control, avoiding the problems that the oil consumption is high due to the fact that the idle rotating speeds of the engines are increased too much, avoiding the problems that the idle rotating speeds of the engines are increased insufficiently and the generated energy of the generator cannot meet the power load requirements, and ensuring that the output of the generator and the power consumption of the whole vehicle are balanced. The whole implementation process can be realized only by adding a software function without adding an additional hardware device, and the cost can be effectively controlled.
Specifically, as shown in fig. 2, step S1 specifically includes the steps of:
s11, acquiring the electric quantity of a storage battery and the load of a generator when the engine is in an idling state;
s12, acquiring a set electric quantity threshold and a set load threshold;
and S13, judging whether the electric quantity of the storage battery is smaller than the electric quantity threshold value, judging whether the load of the generator is larger than the load threshold value, and activating the engine idling classification calculation if the electric quantity of the storage battery is smaller than the electric quantity threshold value and the load of the generator is larger than the load threshold value.
In this embodiment, the electric quantity threshold is set to 50%, the load threshold is set to 95%, when the electric quantity of the battery is lower than 50% and the load of the generator is greater than 95%, it indicates that the electric quantity of the battery is small and the generator is fully operated, and at this time, it may be necessary to increase the idle speed of the engine, it is determined that the active idle speed classification calculation of the engine is activated, and step S2 is executed to perform the idle speed classification calculation. If the electric quantity of the storage battery is not lower than 50%, the electric quantity of the storage battery is still sufficient, and the electric load can be continuously supported; if the load of the generator is not more than 95%, the electric load of the automobile can be satisfied by increasing the load of the generator, and in either case, the idle speed of the engine can not be increased temporarily, namely, the condition for activating the graded calculation of the idle speed of the engine is not satisfied.
Preferably, step S3 comprises:
s31, calculating a generator rotating speed G corresponding to the first electric load grade according to the first electric load grade and the generator characteristic, and taking the generator rotating speed G as a generator target rotating speed;
and S32, dividing the target rotating speed of the generator by the speed ratio C of the generator to calculate the target rotating speed T of the engine in an idling state.
Specifically, as shown in fig. 3, the battery discharge current I is compared with each current interval, a current interval in which the battery discharge current I falls is determined, and the current power load level is determined based on the current interval. For a specific generator, under different electric load grades, a generator rotating speed is corresponding to the generator, so that the generator can provide electric quantity corresponding to the electric load grade. Different generators have different generator characteristics, and designers can make a corresponding relation graph (such as a relation graph shown in fig. 3) of the electric load and the generator rotating speed according to the characteristics, and can determine the generator rotating speed G corresponding to the electric load by contrasting the corresponding relation graph of the electric load and the generator rotating speed G as the target generator rotating speed as long as the electric load grade is determined. Then, the target engine speed T in the idling state is calculated by dividing the target generator speed G by the generator speed ratio C. The target rotating speed of the engine in the idle speed state calculated by the method fully considers closely related factors such as power load, generator characteristics and speed ratio, is more accurate than the traditional mode, and is more beneficial to realizing balance between power supply and vehicle-mounted power consumption.
In this embodiment, the set 6 current intervals are obtained, and for convenience of description, the current intervals are respectively the first current interval to the sixth current interval, the boundary values are respectively 15A, 10A, 5A, 0A and-5A (the battery discharge current I is a positive number indicating that the battery is charged, and a negative number indicating that the battery is discharged to the outside), and the 6 power load LEVELs corresponding to the current intervals are respectively LEVEL0, LEVEL1, LEVEL2, LEVEL3, LEVEL4 and LEVEL5. According to the generator characteristics, the generator rotation speed G corresponding to each electric load grade is determined to be G0, G1, G2, G3, G4 and G5 respectively. When G is G0, the target engine speed in the idle state is the original idle speed, that is, the target engine speed in the idle state is not changed, which indicates that the charging current of the battery is large at this time, so that the power shortage phenomenon does not occur temporarily, and the engine may be kept at the original idle speed. By comparing the discharge current I of the storage battery with the boundary values, the load level of the current electric load can be judged, so that the corresponding rotating speed of the generator is obtained, and the corresponding target rotating speed T of the engine in the idling state is calculated. As shown in table 1.
TABLE 1
Thus, in steps S2 and S3, it is first determined whether the battery discharge current I is greater than 15A, if so, it is determined that the battery discharge current I falls within the first current interval, at this time, the LEVEL of the electrical load is LEVEL0, the corresponding rotational speed of the generator is G0, and the target rotational speed T0 in the idle state of the engine is the original idle rotational speed; if I is not greater than 15A, judging whether the discharge current I of the storage battery is greater than 10A, if so, judging that the discharge current I of the storage battery falls into a second current interval, wherein the LEVEL of the electrical load is LEVEL1, the corresponding rotating speed of the generator is G1, and the target rotating speed T1 of the engine in an idling state is equal to G1/C; if the discharge current I of the storage battery is not more than 10A, judging whether the discharge current I of the storage battery is more than 5A, if so, judging that the discharge current I of the storage battery falls into a third current interval, wherein the LEVEL of the electrical load is LEVEL2, the corresponding rotating speed of the generator is G2, and the target rotating speed T2 of the engine in an idling state is equal to G2/C; if the discharge current I of the storage battery is not more than 5A, judging whether the discharge current I of the storage battery is more than 0A, if so, judging that the discharge current I of the storage battery falls into a fourth current interval, wherein the LEVEL of the electrical load is LEVEL3, the corresponding rotating speed of the generator is G3, and the target rotating speed T3 of the engine in an idling state is equal to G3/C; if the discharge current I of the storage battery is not more than 0A, judging whether the discharge current I of the storage battery is more than-5A, if so, judging that the discharge current I of the storage battery falls into a fifth current interval, wherein the LEVEL of the electrical load is LEVEL4, the corresponding rotating speed of the generator is G4, and the target rotating speed T4 of the engine in an idling state is equal to G4/C; and if the discharge current I of the storage battery is not more than-5A, judging that the discharge current I of the storage battery falls into a sixth current interval, wherein the electric load LEVEL is LEVEL5, the corresponding rotating speed of the generator is G5, and the target rotating speed T5 of the engine in the idling state is equal to G5/C. Therefore, the engine idling speed can be controlled in a grading mode according to the electric load, the calculated target rotating speed T under the engine idling state is more accurate, and different electric load working conditions can be accurately matched.
It is understood that, in other embodiments, the number and the boundary value of the current intervals may be set to other values, which current interval the battery discharging current falls into is determined, and the method for determining the target rotation speed of the generator and the target rotation speed T in the idle state of the engine according to the current interval is similar to that of the present embodiment and will not be described herein again.
As a preferred embodiment, please refer to fig. 2, fig. 3 and fig. 4, wherein the step S3 further includes the steps of:
and S33, correcting the target rotating speed T in the idling state of the engine.
Preferably, step S33 includes the steps of:
s331, acquiring the ambient temperature or the water temperature in a water tank or the temperature of a generator or the temperature of a storage battery, and correcting the target rotating speed T of the engine in an idling state according to the acquired temperature value;
s332, determining the rotating speed of a resonance point when the mode of the engine and the auxiliary frame generate resonance, and correcting the target rotating speed T of the engine in the idling state according to the rotating speed of the resonance point.
Further, step S331 includes the steps of:
s3311, acquiring the ambient temperature or the water temperature in a water tank or the temperature of a generator or a storage battery;
s3312, acquiring a plurality of preset temperature intervals, wherein each temperature interval corresponds to one correction rotating speed r;
s3313, determining the obtained temperature value and the falling preset temperature interval, and adding the target rotating speed T and the corrected rotating speed r in the idling state of the engine to obtain a new target rotating speed T + r in the idling state of the engine.
Step S332 includes the steps of:
s3321, determining the rotating speed of a resonance point when the modal of the engine and the auxiliary frame generate resonance;
s3322, comparing the rotating speed of the resonance point with the target rotating speed T + r in the new idle state of the engine, if the rotating speed of the resonance point is consistent with the target rotating speed T + r in the new idle state of the engine, adjusting the target rotating speed in the idle state of the engine to avoid the rotating speed of the resonance point, and if the rotating speed of the resonance point is inconsistent with the target rotating speed T + r in the idle state of the engine, not adjusting the target rotating speed in the idle state of the engine.
The target rotating speed of the engine in the idling state is correspondingly corrected by detecting the ambient temperature or the water temperature in the water tank or the temperature of the generator or the temperature of the storage battery (any temperature value can be detected), and the aim that when the temperature is too high or too low, the charging efficiency of the generator and the storage battery is reduced, and the idling rotating speed of the engine needs to be additionally increased is mainly considered. In this embodiment, when the obtained temperature value is less than or equal to minus 15 ℃, the corresponding correction rotation speed is set to be 30rpm, and the corrected target rotation speed T + r in the idle state of the engine is the target rotation speed T in the idle state of the engine calculated in step S32 plus 30rpm; when the obtained temperature value is more than minus 15 ℃ and less than 100 ℃, the corresponding correction rotating speed is set to be 0rpm, and the target rotating speed of the engine in the idling state is still the target rotating speed of the engine in the idling state calculated in the step S32; when the obtained temperature value is greater than or equal to 100 ℃, the corresponding correction rotating speed is set to be 50rpm, and the corrected target rotating speed T + r in the idle state of the engine is the target rotating speed T in the idle state of the engine calculated in the step S32 plus 50rpm.
When the idle speed of the engine reaches a certain value, resonance is generated with the subframe mode, the value is determined as a resonance point speed, if the target speed T + r in the idle state of the engine obtained through correction in step S3313 is equal to the resonance point speed, the target speed in the idle state of the engine needs to be adjusted to avoid the resonance point speed, and if not, no adjustment is needed.
After step S33, the method further includes the steps of:
and S34, sending the target rotating speed T in the idling state of the engine to the engine so that the engine adjusts the current rotating speed to the target rotating speed T in the idling state of the engine.
Step S34 finally completes the adjustment of the engine idle rotation speed.
As a preferable scheme, as shown in fig. 2 and fig. 5, before step S1, the method further includes the steps of:
s01, detecting whether the engine is in an idling working condition, and executing a step S02 if the engine is in the idling working condition;
and S02, detecting whether the state of the storage battery and the state of the generator are normal, if the state of the storage battery and the state of the engine are both normal, judging that the engine is in an idling state, and otherwise, judging that the engine is not in the idling state.
In this way, only when the engine is confirmed to be in the idle working condition and the states of the storage battery and the generator are normal, the engine is allowed to be judged to be in the idle state, and the step S1 is executed.
Step S01 specifically includes the steps of:
s011, acquiring the current engine speed;
s012, comparing whether the current rotating speed of the engine is larger than a rotating speed threshold value, if so, executing S013;
s013, judging whether the opening degree of an accelerator pedal is larger than 0, and if so, executing a step S014;
and S014, judging whether the automobile gear is in a P gear or an N gear, if so, judging that the automobile gear is in an idling working condition, and executing the step S02.
In step S02, the method for detecting whether the state of the storage battery is normal is to detect whether the sensor signal flag of the storage battery is valid, and if so, determine that the state of the storage battery is normal, otherwise, determine that the state of the storage battery is abnormal. The method for detecting whether the state of the generator is normal comprises the steps of detecting whether a state communication signal of the generator can be normally received, if so, judging that the state of the generator is normal, and otherwise, judging that the state of the generator is abnormal.
Referring to fig. 6, the present invention further provides an engine control device, for implementing the above-mentioned engine idle speed control method, including: the system comprises a classification calculation activation judging module 10, a load grade determining module 20, a rotating speed calculating module 30 and an engine rotating speed adjusting module 40. The hierarchical calculation activation judging module 10 is used for judging whether to activate the hierarchical calculation of the idle speed of the engine according to the electric quantity of the storage battery 50 and the load of the generator 60 when the engine is in the idle speed state. When the judgment result of the step calculation activation judgment module 10 is yes, the load level determination module 20 obtains the battery discharging current, determines a first current interval corresponding to the battery discharging current from a plurality of preset current intervals, determines a first electric load level corresponding to the first current interval, and transmits the first electric load level to the rotation speed calculation module 30, wherein each current interval is provided with a corresponding electric load level. The rotating speed calculating module 30 calculates a target rotating speed in an engine idling state corresponding to the first electric load grade according to the first electric load grade, the generator characteristic and the generator speed ratio, and the engine rotating speed adjusting module 40 adjusts the current rotating speed of the engine 70 to the target rotating speed in the engine idling state, so that whether the rotating speed of the engine 70 needs to be increased or not is determined jointly through the electric quantity of the storage battery 50, the load of the generator 60 and the discharging current I of the storage battery, the rotating speed of the engine 70 is adjusted in a targeted manner according to different electric loads, and accurate hierarchical control is performed, so that the problems that the oil consumption is high due to the fact that the idle rotating speed of the engine 70 is increased excessively, the generated energy of the generator 60 cannot meet the electric load requirement due to the fact that the idle rotating speed of the engine 70 is increased insufficiently and the electric consumption of the whole vehicle cannot be balanced are solved, and the output of the generator 60 and the electric consumption of the whole vehicle are balanced.
Preferably, as shown in fig. 7, the hierarchical calculation activation determination module 10 includes a first obtaining unit 11, a first determination unit 12, a second obtaining unit 13 and a second determination unit 14, the first obtaining unit 11 is configured to obtain the electric quantity of the battery 50 and transmit the electric quantity to the first determination unit 12, the first determination unit 12 compares the electric quantity of the battery 50 obtained by the first obtaining unit 11 with an electric quantity threshold value to determine whether the electric quantity is smaller than the electric quantity threshold value, if the electric quantity of the battery 50 is smaller than the electric quantity threshold value, a signal is sent to the second obtaining unit 13, the second obtaining unit 13 starts to obtain the load of the generator 60, and then transmits the obtained load of the generator 60 to the second determination unit 14, the second determination unit 14 compares the load of the generator 60 obtained by the second obtaining unit 13 with a load threshold value to determine whether the load is larger than the load threshold value, and if the load of the generator 60 is larger than the load threshold value, the second determination unit 14 sends a signal to activate the hierarchical calculation of the engine idle speed to the load level determination module 20.
In a preferred embodiment, the rotation speed calculation module 30 includes a first calculation unit 31 and a second calculation unit 32, the first calculation unit 31 receives the first electrical load level determined by the load level determination module 20, calculates a generator rotation speed corresponding to the first electrical load level according to the first electrical load level and the generator characteristics, sets the generator rotation speed as a generator target rotation speed, and then transmits the generator target rotation speed to the second calculation unit 32, and the second calculation unit 32 divides the generator target rotation speed by a generator speed ratio to obtain a target rotation speed in an engine idling state.
Preferably, the control device further comprises a correction module 80, and the correction module 80 is used for correcting the target rotating speed in the idle state of the engine. Specifically, steps S331 and S332 described above are performed. Preferably, the correcting module 80 includes a first detecting unit 81, a first storage unit 82, a first correcting unit 83, a second storage unit 84, and a second correcting unit 85, the first detecting unit 81 is configured to detect an ambient temperature or a water temperature in a water tank or a temperature of the generator 60 or a temperature of the battery 50, the first storage unit 82 is configured to store a plurality of preset temperature ranges and corresponding corrected rotation speeds, the first correcting unit 83 receives the temperature detected by the first detecting unit 81, compares the temperature with the preset temperature range stored in the first storage unit 82, determines a corresponding corrected rotation speed, adds the target rotation speed in the engine idling state and the corrected rotation speed to obtain a new target rotation speed in the engine idling state, the second correcting unit 85 reads the stored resonance point rotation speed from the second storage unit 84, compares the new target rotation speed in the engine idling state with the resonance point rotation speed, and adjusts the target rotation speed in the engine idling state if the two rotation speeds are the same, and then transmits the adjusted target rotation speed in the engine idling state to the engine rotation speed adjusting module 40.
Preferably, the control device further comprises an idle state judgment module 90, and the idle state judgment module 90 is used for judging whether the engine is in an idle state or not. Further preferably, the idling state determination module 90 includes a third obtaining unit 91, a third determining unit 92, a fourth determining unit 94 and a fifth determining unit 96. The third obtaining unit 91 is configured to obtain a current rotation speed of the engine 70, the third determining unit 92 determines whether the rotation speed of the engine obtained by the third obtaining unit 91 is greater than a rotation speed threshold, if the rotation speed of the engine is greater than the rotation speed threshold, the fourth obtaining unit 93 obtains an opening degree of an accelerator pedal, the fourth determining unit 94 determines whether the opening degree of the accelerator pedal obtained by the fourth obtaining unit 93 is greater than 0, and when the opening degree of the accelerator pedal is greater than 0, the fifth obtaining unit 95 obtains a gear position of the vehicle, the fifth determining unit 96 determines whether the gear position of the vehicle is in a P gear or an N gear, and when the gear position of the vehicle is in the P gear or the N gear, the vehicle is determined to be in an idle operating condition.
Further, the idling state determining module 90 further includes a second detecting unit 97 and a third detecting unit 98, where the second detecting unit 97 is configured to detect whether a sensor signal flag of the battery 50 is valid, the third detecting unit 98 is configured to detect whether a state communication signal of the generator 60 can be normally received, and when the automobile is in an idling condition and detection results of the second detecting unit 97 and the third detecting unit 98 are normal, the hierarchical calculation activation determining module 10 is started.
In another aspect of the present embodiment, a readable storage medium is also provided, and the readable storage medium includes a stored computer program, where when the computer program runs, a device in which the readable storage medium is located may be controlled to execute the control method of the engine in the foregoing embodiments.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In summary, the control method, the control device and the readable storage medium of the engine of the invention comprehensively judge the power demand through the electric quantity of the storage battery, the load of the generator and the discharge current of the storage battery, and determine whether the idle speed of the engine needs to be increased, thereby avoiding increasing the idle speed of the engine to increase the oil consumption when unnecessary, preventing the risk of power shortage, being more accurate and reasonable and meeting the actual demand. Different storage battery discharging currents represent power loads of different sizes, the target rotating speed of the engine in the idling state is obtained through the storage battery discharging currents, the characteristics of the generator and the speed ratio of the generator in a calculation mode, the engine can drive the generator to be better matched and adapted to different power load working conditions, accurate hierarchical control is achieved, the problem that the oil consumption is high due to the fact that the idling rotating speed of the engine is excessively increased can be avoided, the problem that the idling rotating speed of the engine is not sufficiently increased, the generated energy of the generator cannot meet the power load requirement is solved, the output of the generator and the power consumption of the whole vehicle are guaranteed to be balanced, and the electric generator has high application and popularization values.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A control method of an engine, characterized by comprising the steps of:
when the engine is in an idling state, judging whether to activate engine idling hierarchical calculation according to the electric quantity of the storage battery and the load of the generator;
if the judgment result is activation, acquiring the discharge current of the storage battery, and determining a first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals so as to determine a first electric load grade corresponding to the first current interval; each current interval is provided with a corresponding electric load grade;
according to the first electric load grade, the characteristics of a generator and a speed ratio of the generator, calculating a target rotating speed in an idle state of the engine corresponding to the first electric load grade so that the engine can adjust the current rotating speed to the target rotating speed in the idle state of the engine, wherein the method comprises the following steps:
acquiring the ambient temperature or the water temperature in a water tank or the temperature of a generator or the temperature of a storage battery, and acquiring a plurality of preset temperature intervals, wherein each temperature interval corresponds to a correction rotating speed; determining a preset temperature interval in which the obtained temperature value falls, and adding the target rotating speed of the engine in an idling state with the corrected rotating speed to obtain a new target rotating speed of the engine in the idling state;
or comparing the resonance point rotating speed with the target rotating speed in the new engine idling state, and if the resonance point rotating speed and the target rotating speed in the new engine idling state are consistent, adjusting the target rotating speed in the engine idling state to avoid the resonance point rotating speed.
2. The engine control method according to claim 1, wherein the step of determining whether to activate the engine idle speed classification calculation based on the battery level and the generator load while the engine is in the idle state comprises:
when the engine is in an idling state, acquiring the electric quantity of a storage battery and the load of a generator, and acquiring a set electric quantity threshold value and a set load threshold value;
judging whether the electric quantity of the storage battery is smaller than the electric quantity threshold value or not, and judging whether the load of the generator is larger than the load threshold value or not;
and if the electric quantity of the storage battery is smaller than the electric quantity threshold value and the load of the generator is larger than a load threshold value, activating engine idling classification calculation.
3. The engine control method according to claim 1, characterized by, before the step of determining whether to activate the engine idle speed classification calculation based on the battery level and the generator load at the time of the engine idle speed state, further comprising the steps of:
detecting whether the engine is in an idling working condition, and if so, detecting whether the state of the storage battery and the state of the engine are normal;
if the storage battery state and the engine state are both normal, judging that the storage battery state and the engine state are in an engine idling state;
otherwise, it is determined that the engine is not in the idle state.
4. The engine control method according to claim 3, wherein the step of detecting whether the engine is in an idle condition includes:
acquiring the current rotating speed of an engine;
comparing whether the current rotating speed of the engine is greater than a rotating speed threshold value, and if so, judging whether the opening of an accelerator pedal is greater than 0;
if the opening degree of the accelerator pedal is larger than 0, judging whether the automobile gear is in a P gear or an N gear;
and if the automobile gear is in the P gear or the N gear, judging that the automobile gear is in the idling working condition.
5. A control device of an engine, characterized by comprising: the device comprises a hierarchical calculation activation judgment module, a load grade determination module, a rotating speed calculation module, a correction module and an engine rotating speed adjustment module;
the hierarchical calculation activation judging module is used for judging whether to activate the hierarchical calculation of the idle speed of the engine according to the electric quantity of the storage battery and the load of the generator when the engine is in the idle speed state;
the load grade determining module is used for acquiring the discharge current of the storage battery when the judgment result of the activation judging module is yes, and determining a first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals so as to determine a first electric load grade corresponding to the first current interval; each current interval is provided with a corresponding electric load grade;
the rotating speed calculation module is used for calculating a target rotating speed in an engine idling state corresponding to the first electric load grade according to the current electric load grade, the generator characteristic and the generator speed ratio;
the correction module comprises a first detection unit, a first storage unit, a first correction unit, a second storage unit and a second correction unit;
the first detection unit is used for detecting the ambient temperature or the water temperature in the water tank or the temperature of the generator or the temperature of the storage battery;
the first storage unit is used for storing a plurality of preset temperature intervals and corresponding correction rotating speeds;
the first correction unit is used for determining a preset temperature interval in which the temperature value acquired by the first detection unit falls, and adding the target rotating speed in the idling state of the engine to the correction rotating speed to obtain a new target rotating speed in the idling state of the engine;
the second storage unit is used for storing the rotating speed of the resonance point;
the second correction unit is used for comparing whether the rotating speed of the resonance point is consistent with the target rotating speed in the new idling state of the engine or not, and if so, adjusting the target rotating speed in the idling state of the engine to avoid the rotating speed of the resonance point;
the engine rotating speed adjusting module is used for adjusting the current rotating speed of the engine to the target rotating speed of the engine in the idle state.
6. The control device according to claim 5, wherein the hierarchical calculation activation judgment module includes a first acquisition unit, a first determination unit, a second acquisition unit, a second determination unit;
the first acquisition unit is used for acquiring the electric quantity of the storage battery;
the first judging unit is used for judging whether the electric quantity of the storage battery is smaller than an electric quantity threshold value;
the second acquisition unit is used for acquiring the load of the generator;
and the second judging unit is used for judging whether the load of the generator is greater than a load threshold value when the electric quantity of the storage battery is less than an electric quantity threshold value, and sending a signal for activating the engine idling classification calculation when the judgment result is yes.
7. The control device according to claim 5, characterized by further comprising an idle state judgment module for judging whether an engine is in an idle state;
the idle state determination module is further configured to:
acquiring the current rotating speed of the engine;
comparing whether the current rotating speed of the engine is greater than a rotating speed threshold value, and if so, judging whether the opening of an accelerator pedal is greater than 0;
if the opening degree of the accelerator pedal is larger than 0, judging whether the automobile gear is in a P gear or an N gear;
and if the automobile gear is in the P gear or the N gear, judging that the automobile gear is in the idling working condition.
8. A readable storage medium, characterized in that the readable storage medium comprises a stored computer program, wherein the readable storage medium, when the computer program is executed, controls an apparatus to execute the control method of an engine according to any one of claims 1 to 4.
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| CN114771439B (en) * | 2022-05-24 | 2024-10-11 | 中国第一汽车股份有限公司 | Vehicle-mounted power generation amount control method and device in idle speed of vehicle and vehicle |
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| US20090183712A1 (en) * | 2008-01-22 | 2009-07-23 | Richard Owens | Idle speed adjustment system |
| US9211890B2 (en) * | 2012-01-11 | 2015-12-15 | Toyota Jidosha Kabushiki Kaisha | Vehicle control device, vehicle and vehicle control method |
| CN103452684B (en) * | 2013-08-16 | 2018-04-10 | 浙江吉利汽车研究院有限公司 | Idling start-stop controlling method and control system |
| CN107630758B (en) * | 2016-07-18 | 2020-05-01 | 上海汽车集团股份有限公司 | Method and device for controlling idle speed of engine |
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