CN113404598B - Engine control method, engine control device and readable storage medium - Google Patents

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

Engine control method, control device and readable storage medium

technical field

The invention relates to the technical field of automobile engine speed control, in particular to an engine control method, a control device and a readable storage medium.

Background technique

The idling condition of the car refers to the working state of the engine when it is idling. For the sake of controlling fuel consumption and emissions, under the idling condition, the engine idling speed is usually low. The engine of the car is connected to the generator drive, the engine can drive the generator to work, and the speed and power generation efficiency of the generator are positively related to the speed of the engine, the generator supplies power to the car's on-board electrical equipment, or stores the generated electric energy in the car in the battery. In the idling condition, due to the low engine speed, the power generation efficiency of the generator is also at a low level. If the window heating is turned on, the output power of the generator may be exceeded, and the vehicle battery needs to be discharged to supplement the power supply. However, if the battery power is continuously consumed in large quantities, it will cause power loss and affect the service life of the battery power. Therefore, it is necessary to control the adjustment of the idle speed of the engine to better adapt to the electric load under the idle speed condition. However, the current engine idle speed control method is often only based on one of factors such as the generator voltage, the available power of the battery, whether the high-power electrical equipment is turned on, etc., to slightly increase the engine idle speed, and there is no The engine speed is controlled in stages according to different power load conditions. As long as the idle speed increase condition is met, the engine speed is adjusted to a fixed target speed. It is difficult to comprehensively and reasonably judge the power demand and speed demand of the vehicle, and the engine speed cannot Reach an effective balance with power consumption.

Contents of the invention

The purpose of the present invention is to provide an engine control method, control device and readable storage medium, which can accurately identify the state of electric load, and accurately adjust the idle speed of the engine according to the state of electric load, so as to effectively match the electric load.

In order to achieve the above object, the present invention provides a control method for an engine, which includes the following steps:

When the engine is idle, judge whether to activate the engine idle classification calculation according to the battery power and generator load;

If the judging result is active, then acquire the discharge current of the storage battery, and determine the first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals, so as to determine the first current interval corresponding to the first current interval. Electrical load level; among them, each current interval is set with a corresponding electrical load level;

According to the first power load level, generator characteristics, and generator speed ratio, calculate the target speed of the engine at idle speed corresponding to the first power load level, so that the engine adjusts the current speed to The target speed of the engine at idle speed.

As a preferred solution, when the engine is in an idle state, the step of judging whether to activate the engine idle classification calculation according to the battery power and the generator load includes:

When the engine is idling, obtain the battery power and generator load, and obtain the set power threshold and load threshold;

Judging whether the battery power is less than the power threshold, and judging whether the generator load is greater than the load threshold;

If the electric quantity of the storage battery is less than the electric quantity threshold and the load of the generator is greater than the load threshold, the engine idle speed classification calculation is activated.

As a preferred solution, according to the current power load level, generator characteristics, and generator speed ratio, calculate the target speed of the engine at idle speed corresponding to the current power load level, so that the The step of adjusting the current rotational speed of the engine to the target rotational speed under the idling state of the engine further includes:

Obtain the ambient temperature or the water temperature in the water tank or the temperature of the generator or the battery temperature, and correct the target speed of the engine at idle speed according to the obtained temperature value;

Alternatively, the resonance point rotational speed when the engine and the sub-frame modal resonance occurs is determined, and the target rotational speed in the idle state of the engine is corrected according to the resonance point rotational speed.

As a preferred solution, the step of obtaining the ambient temperature or the water temperature in the water tank or the generator temperature or the battery temperature, and correcting the target speed of the engine at idle speed according to the obtained temperature value is specifically:

Obtain the ambient temperature or the water temperature in the water tank or the generator temperature or the battery temperature, and obtain several preset temperature ranges, each temperature range corresponds to a corrected speed;

Determine the preset temperature range that the obtained temperature value falls into, and add the target speed in the idle state of the engine to the corrected speed to obtain a new target speed in the idle state of the engine;

The step of correcting the target rotational speed under the idle state of the engine according to the resonance point rotational speed comprises:

The resonant speed is compared with the new target revolving speed in the idle state of the engine, and if they are the same, the target revolving speed in the idle state of the engine is adjusted to avoid the resonant speed.

As a preferred solution, before the step of judging whether to activate the engine idle classification calculation according to the electric quantity of the battery and the load of the generator when the engine is idling, the step further includes:

Detect whether the engine is in idling condition, if so, detect whether the state of the battery and the state of the engine are normal;

If both the battery state and the engine state are normal, it is determined that the engine is in the idle state;

Otherwise, it is determined that the engine is not in an idle state.

As a preferred solution, the step of detecting whether the engine is in an idle state includes:

Get the current engine speed;

Compare whether the current speed of the engine is greater than the speed threshold, and if so, determine whether the opening of the accelerator pedal is greater than 0;

If the opening degree of the accelerator pedal is greater than 0, it is judged whether the car gear is in the P gear or the N gear;

If the car gear is in the P or N gear, it is determined to be in the idling condition.

The present invention also provides a control device for an engine, comprising: a classification calculation activation judgment module, a load level determination module, a rotational speed calculation module and an engine rotational speed adjustment module;

The classification calculation activation judgment module is used to judge whether to activate the engine idle classification calculation according to the battery power and generator load when the engine is in an idle state;

The load level determination module is used to obtain the discharge current of the battery when the judgment result of the activation judgment module is yes, and determine the first current interval corresponding to the discharge current of the battery from a plurality of preset current intervals, so as to determine The first electricity load level corresponding to the first current interval; wherein, a corresponding electricity load level is set for each current interval;

The rotational speed calculation module is used to calculate the target rotational speed of the engine in an idle state corresponding to the first electrical load level according to the current electrical load level, generator characteristics, and generator speed ratio;

The engine speed adjustment module is used to adjust the current speed of the engine to the target speed in the idle state of the engine.

As a preferred solution, the hierarchical calculation activation judgment module includes a first acquisition unit, a first judgment unit, a second acquisition unit, and a second judgment unit;

The first acquisition unit is used to acquire battery power;

The first judging unit is used to judge whether the battery power is less than a power threshold;

The second acquisition unit is used to acquire generator load;

The second judging unit is used for judging whether the generator load is greater than a load threshold, and if the judging result is yes, send a signal for activating the calculation of the engine idle speed classification.

As a preferred solution, the control device further includes a correction module, which is used to correct the target speed of the engine in an idle state.

As a preferred solution, the correction module includes 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 to detect the ambient temperature or the water temperature in the water tank or the temperature of the generator or the battery;

The first storage unit is used to store several preset temperature ranges and their corresponding corrected rotational speeds;

The first correction unit is used to determine the preset temperature range that the temperature value obtained by the first detection unit falls into, and add the target speed under the engine idle state to the corrected speed to obtain a new engine idle state. target speed;

The second storage unit is used to store the resonance point rotational speed;

The second correction unit is used to compare whether the resonance point speed is consistent with the new target speed in the idle state of the engine, and if they are consistent, adjust the target speed in the idle state of the engine to avoid the resonance point speed.

As a preferred solution, the control device further includes an idling state judging module, the idling state judging module is used to judge whether the engine is in an idling state;

The idling state judging module is also used for:

Get the current engine speed;

Compare whether the current speed of the engine is greater than the speed threshold, and if so, determine whether the opening of the accelerator pedal is greater than 0;

If the opening degree of the accelerator pedal is greater than 0, it is judged whether the car gear is in the P gear or the N gear;

If the car gear is in the P or N gear, it is determined to be in the idling condition.

The present invention also provides a readable storage medium, the readable storage medium includes a stored computer program, wherein, when the computer program is running, the device where the readable storage medium is located is controlled to execute any of the above technical solutions. Engine control method.

Compared with the prior art, the beneficial effects of the present invention are:

In the engine control method of the present invention, when the engine is in an idling state, first obtain the battery power and generator load, determine whether to activate the engine idling calculation according to the battery power and generator load, usually judge whether the battery power is low according to the battery power, Judging whether the generator is working at full load according to the generator load, if the battery power is relatively sufficient or the generator load is small, it is not necessary to increase the engine idle speed, and the judgment result is that the engine idle speed classification calculation is not activated. If the battery power is low and the generator is working at full load, it indicates that the engine idle speed may need to be increased at this time. The judgment result is to activate the engine idle speed classification calculation, and obtain the battery discharge current, set several preset current ranges, and the acquired battery The magnitude of the discharge current is compared with the preset current interval to determine the first current interval corresponding to the discharge current of the battery, so as to determine the first electric load corresponding to the first current interval, which is the current electric load level, and according to the first current interval Calculate the required speed of the engine by using the electric load level, the characteristics of the generator and the speed ratio of the generator to obtain the target speed of the engine at idle speed, and then send the target speed of the engine at idle speed to the engine, so that the The engine adjusts the current speed to the target speed under the engine idle state. In this way, the electricity demand is judged comprehensively based on the battery power, generator load and battery discharge current, and whether it is necessary to increase the engine idle speed, which not only avoids increasing the engine idle speed when it is not necessary to increase fuel consumption, but also prevents the risk of power loss, which is more accurate Reasonable and in line with actual needs. According to different battery discharge currents, determine different levels of power loads, and then calculate target speeds of different sizes of engines at idle speeds according to different power load levels, generator characteristics, and generator speed ratios, which can be determined according to different loads The working conditions are targeted to adjust the engine speed to different sizes, so that the engine drives the generator to better match and adapt to different power load conditions, and realize precise graded control, which can not only avoid excessive increase in engine idle speed resulting in high fuel consumption, but also avoid The engine idle speed is not enough to increase, and the power generation of the generator can not meet the needs of the electricity load, so as to ensure the balance between the generator output and the power consumption of the whole vehicle.

The engine control device and the storage medium of the control method of the present invention can realize the above-mentioned engine control method, and thus also have the same technical effect.

Description of drawings

Fig. 1 is a schematic diagram of an engine control method provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of an engine control method provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of step S2 and step S3 provided by the embodiment of the present invention;

FIG. 4 is a schematic diagram of step S33 provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of step S01 and step S02 provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram of a control device provided by an embodiment of the present invention;

Fig. 7 is a schematic diagram of another control device provided by an embodiment of the present invention.

Among them, 10. Grading calculation activation judgment module; 11. First acquisition unit; 12. First judgment unit; 13. Second acquisition unit; 14. Second judgment unit; 20. Load level determination module; 30. Speed calculation module 31. The first calculation unit; 32. The second calculation unit; 40. The engine speed adjustment module; 50. The storage battery; 60. The generator; 70. The engine; 80. The correction module; 81. The first detection unit; 82. A storage unit; 83, the first correction unit; 84, the second storage unit; 85, the second correction unit; 90, the idling state judgment module; 91, the third acquisition unit; 92, the third judgment unit; 93, the fourth An acquisition unit; 94, a fourth determination unit; 95, a fifth acquisition unit; 96, a fifth determination unit; 97, a second detection unit; 98, a third detection unit.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "first", "second" and so on are only used for descriptive purposes, and should not be understood as indicating or implying relative importance.

Please refer to Fig. 1, which schematically shows a method for controlling an engine of the present invention, including the following steps:

S1. When the engine is idling, judge whether to activate the engine idling classification calculation according to the battery power and generator load;

S2. If the judging result is active, obtain the battery discharge current I, and determine the first current interval corresponding to the battery discharge current from a plurality of preset current intervals, so as to determine the current interval corresponding to the first current interval. The first electricity load level; wherein, a corresponding electricity load level is set for each current interval;

S3. According to the first power load level, the characteristics of the generator, and the generator speed ratio C, calculate the target speed T of the engine at idle speed corresponding to the first power load level, so that the engine will The current rotational speed is adjusted to the target rotational speed T in the idle state of the engine.

Wherein, the first current interval is the current interval corresponding to the current battery discharge current, and the first electricity load level is the current electricity load level corresponding to the first current interval.

Specifically, in step S1, when the engine is in the idle state, according to the battery power and generator load, it is judged whether to activate the process of calculating the engine idle speed classification, mainly according to the size of the battery power and the generator load to determine whether to activate the engine idle speed classification Calculate, if the battery power is small, it means that the battery power is insufficient, otherwise it means that the battery power is sufficient. If the load of the generator is close to the limit, it means that the generator is running at full load, otherwise it means that the generator is not running at full load. When the battery power is sufficient or the generator is not fully loaded, there is no need to increase the engine idle speed, and the engine idle speed classification calculation is not activated. When the battery power is insufficient and the generator is running at full load, activate the engine idle speed classification calculation, continue to execute step S2, obtain the battery discharge current I, and set several preset current intervals, and set a corresponding power consumption for each current interval Load level, determine the first current interval corresponding to the discharge current I of the battery, so as to determine the first electricity load level corresponding to the first current interval, that is, the current electricity load level, combined with the characteristics of the generator 1. Generator speed ratio C calculates the target speed under the idle state of the engine, wherein, the generator characteristic in step S3 refers to the relationship between the power load and the generator speed, that is, the power load of a specific size corresponds to a generator of a specific size For a certain generator, the generator characteristics and generator speed ratio C can be regarded as fixed.

The engine control method based on the above-mentioned technical features, when the engine is in idle state, first obtain the battery power and generator load, determine whether to activate the engine idle speed calculation according to the battery power and generator load, and usually judge whether the battery power is low or not according to the battery power. Low, judge whether the generator is working at full load according to the generator load. If the battery power is relatively sufficient or the generator load is small, it is not necessary to increase the engine idle speed. The judgment result is that the engine idle speed classification calculation is not activated. If the battery power is low and the generator is working at full load, it indicates that the engine idle speed may need to be increased at this time. The judgment result is to activate the engine idle speed classification calculation, and obtain the battery discharge current I, set several preset current intervals, and the obtained Comparing the magnitude of the discharge current I of the storage battery with the preset current interval, determining the first current interval corresponding to the discharge current of the storage battery, so as to determine the first electric load corresponding to the first current interval, which is the current electric load level, and According to the first power load level, generator characteristics, and generator speed ratio C, the engine speed needs to be calculated to obtain the target speed T under the idle state of the engine, and then send the target speed T under the idle state of the engine to the engine , so that the engine adjusts the current speed to the target speed T in the idle state of the engine. In this way, by comprehensively judging the electricity demand based on battery power, generator load, and battery discharge current I, it is determined whether it is necessary to increase the engine idle speed, which not only avoids increasing the engine idle speed when it is not necessary to increase fuel consumption, but also prevents the risk of power loss, and is more Accurate and reasonable, in line with actual needs. According to different battery discharge current I, determine different levels of power consumption load, and then calculate the target speed T of different sizes of engine idle speed T according to different power consumption levels, generator characteristics, and generator speed ratio C, which can be According to different load conditions, the engine speed is adjusted to different sizes, so that the engine drives the generator to better match and adapt to different power load conditions, and realizes precise hierarchical control, which can avoid excessive increase in engine idle speed and cause high fuel consumption. It can also avoid the problem that the idle speed of the engine is not increased enough, and the power generation of the generator cannot meet the needs of the power load, so as to ensure the balance between the generator output and the power consumption of the vehicle. The whole implementation process does not need to add additional hardware devices, it can be realized only by adding software functions, and the cost can be effectively controlled.

Specifically, as shown in Figure 2, step S1 specifically includes steps:

S11. Obtain battery power and generator load when the engine is in an idle state;

S12. Obtain the set power threshold and load threshold;

S13. Judging whether the battery power is less than the power threshold, judging whether the generator load is greater than the load threshold, if the battery power is less than the power threshold and the generator load is greater than the load threshold, activate the engine idle classification calculate.

In this embodiment, the power threshold is set to 50%, and the load threshold is set to 95%. When the battery power is lower than 50% and the generator load is greater than 95%, it means that the battery power is low and the generator is working at full capacity. At this time, it may be necessary to increase the idle speed of the engine, then it is judged to activate the idle speed classification calculation, and step S2 is executed to perform the idle speed classification calculation. If the power of the battery is not less than 50%, it means that the power of the battery is still relatively sufficient and can continue to support the power load; if the load of the generator is not greater than 95%, it means that the power load of the car can be met by increasing the load of the generator. In any one of the above situations, the engine idle speed may not be increased temporarily, that is, the calculation condition for activating the engine idle speed classification is not satisfied.

Preferably, step S3 includes:

S31. According to the first power load level and the characteristics of the generator, calculate the generator speed G corresponding to the first power load level, and use it as the generator target speed;

S32. Divide the target generator speed by the generator speed ratio C to calculate the target speed T in the idle state of the engine.

Specifically, as shown in FIG. 3 , the battery discharge current I is compared with each current interval to determine the current interval in which the battery discharge current I falls, and the current power load level is determined according to the current interval. For a specific generator, under different power load levels, there is a corresponding generator speed, so that the generator can provide electricity corresponding to the power load level. Different generators have different generator characteristics, and the designer can make a corresponding relationship diagram between power load and generator speed (such as the relationship curve in Figure 3), as long as the power load level is determined, it can be compared The corresponding relationship diagram of the electric load-generator speed determines the generator speed G corresponding to the electric load, and uses the generator speed G as the generator target speed. Afterwards, the generator target speed G is divided by the generator speed ratio C to calculate the target speed T of the engine at idle speed. The target speed calculated in this way under the idle state of the engine fully considers closely related factors such as power load, generator characteristics and speed ratio, which is more accurate than the traditional method, and is more conducive to the realization of power supply and vehicle power consumption. balance.

In this embodiment, the six current intervals set are obtained, for ease of description, they are respectively the first current interval to the sixth current interval, and the boundary values are respectively 15A, 10A, 5A, 0A, -5A (battery discharge current I If it is a positive number, it means the battery is charged, if it is a negative number, it means the battery is discharged to the outside), and set 6 corresponding power load levels, namely LEVEL0, LEVEL1, LEVEL2, LEVEL3, LEVEL4, LEVEL5. According to the characteristics of the generator, determine the generator speed G corresponding to each power load level as G0, G1, G2, G3, G4, G5 respectively. It should be noted that when G is G0, the target speed in the idle state of the engine is the original idle speed, that is, the target speed in the idle state of the engine remains unchanged, which means that the charging current of the battery is relatively large at this time, and there will be no power loss for the time being. Phenomenon, the engine can maintain the original idle speed. By comparing the discharge current I of the battery with each boundary value, it can be judged which load level the current power load is in, so as to obtain the corresponding generator speed, and then calculate the corresponding target speed T in the idle state of the engine. As shown in Table 1.

Table 1

In this way, in steps S2 and S3, it is first judged whether the discharge current I of the storage battery is greater than 15A. The target speed T0 below is the original idle speed; if I is not greater than 15A, it is judged whether the battery discharge current I is greater than 10A, and if so, it is judged that it falls into the second current range. At this time, the power load level is LEVEL1, and the corresponding generator speed is G1, the target speed T1 in the engine idle state is equal to G1/C; if the battery discharge current I is not greater than 10A, then judge whether the battery discharge current I is greater than 5A, if so, determine that it falls into the third current range, and the power consumption at this time The load level is LEVEL2, the corresponding generator speed is G2, and the target speed T2 in the idle state of the engine is equal to G2/C; if the battery discharge current I is not greater than 5A, it is judged whether the battery discharge current I is greater than 0A, and if so, it is judged to be Enter the fourth current interval, at this time, the power load level is LEVEL3, the corresponding generator speed is G3, and the target speed T3 in the idle state of the engine is equal to G3/C; if the battery discharge current I is not greater than 0A, then judge the battery discharge current Whether I is greater than -5A, if so, it is determined that it falls into the fifth current interval, at this time, the power load level is LEVEL4, the corresponding generator speed is G4, and the target speed T4 in the idle state of the engine is equal to G4/C; if the battery is discharged If the current I is not greater than -5A, it is determined that it falls into the sixth current interval. At this time, the power load level is LEVEL5, the corresponding generator speed is G5, and the target speed T5 in the idle state of the engine is equal to G5/C. In this way, the idle speed of the engine can be controlled in stages according to the electric load, and the calculated target speed T under the idle state of the engine is more accurate, which can accurately match different electric load conditions.

It can be understood that, in other embodiments, the number of current intervals and boundary values can be set to other values to determine which current interval the battery discharge current falls into, and determine the target speed of the generator and the target speed under the idle state of the engine according to the current interval. The method of the rotational speed T is similar to that of this embodiment, and will not be repeated here.

As a preferred embodiment, please refer to Figure 2, Figure 3 and Figure 4, the step S3 also includes the steps:

S33. Correct the target rotational speed T in the idle state of the engine.

Preferably, step S33 includes the steps of:

S331. Obtain the ambient temperature or the water temperature in the water tank or the temperature of the generator or the battery temperature, and correct the target speed T of the engine at idle speed according to the obtained temperature value;

S332. Determine the rotational speed at the resonance point when the engine and the sub-frame modal resonance occur, and correct the target rotational speed T under the idle state of the engine according to the rotational speed at the resonance point.

Further, step S331 includes the steps of:

S3311. Obtain the ambient temperature or the water temperature in the water tank or the temperature of the generator or the temperature of the storage battery;

S3312. Obtain several preset temperature ranges set, each temperature range corresponds to a corrected rotational speed r;

S3313. Determine the obtained temperature value and the preset temperature range, and add the target speed T in the idle state of the engine to the corrected speed r to obtain a new target speed T+r in the idle state of the engine.

Step S332 comprises steps:

S3321. Determine the rotational speed of the resonance point when the engine and the sub-frame modal resonate;

S3322. Compare the resonant speed and the new target revolving speed T+r in the idle state of the engine. If they are the same, adjust the target revolving speed in the idle state to avoid the resonant speed. If they are inconsistent, no further adjustment is required. The target speed of the engine at idle speed.

By detecting the ambient temperature or the water temperature in the water tank or the temperature of the generator or the battery temperature (any one of them can be detected), the target speed in the idle state of the engine is correspondingly corrected, mainly considering that when the temperature is too high or too low, It will lead to a reduction in the charging efficiency of the alternator and battery, requiring an additional increase in engine idle speed. In this embodiment, it is set that when the obtained temperature value is less than or equal to minus 15°C, the corresponding corrected rotational speed is set to 30 rpm, and the corrected target rotational speed T+r in the idle state of the engine is calculated in step S32 Add 30rpm to the target speed T under the engine idle state; when the obtained temperature value is greater than minus 15°C and less than 100°C, the corresponding corrected speed is set to 0rpm, and the target speed under the engine idle state is still calculated in step S32 The target speed under the engine idle state; when the temperature value obtained is greater than or equal to 100°C, the corresponding corrected speed is set to 50rpm, and the corrected target speed T+r under the engine idle state is the engine speed calculated in step S32 Target T speed at idle plus 50rpm.

When the idle speed of the engine reaches a certain value, it will resonate with the sub-frame mode, and this value is determined as the resonance point speed, if the target speed T+r in the engine idle state corrected in step S3313 is equal to the resonance point speed, you need to adjust the target speed in the idle state of the engine to avoid the resonance point speed, if it is not equal to, no further adjustment is required.

After step S33, also include steps:

S34. Send the target rotational speed T in the idle state of the engine to the engine, so that the engine adjusts the current rotational speed to the target rotational speed T in the idle state of the engine.

Step S34 finally completes the adjustment of the idle speed of the engine.

As a preferred solution, please refer to Fig. 2 and shown in Fig. 5, before step S1, also include steps:

S01. Detect whether the engine is in an idling condition, and if so, perform step S02;

S02. Detect whether the state of the battery and the state of the generator are normal. If both the state of the battery and the state of the engine are normal, it is determined that the engine is in an idle state; otherwise, it is determined that the state is not in an engine idle state.

In this way, only when it is confirmed that the engine is in the idling condition, and the state of the battery and the generator are both normal, can it be determined that the engine is in the idling state, and step S1 is executed.

Step S01 specifically includes steps:

S011. Obtain the current engine speed;

S012, compare whether the current engine speed is greater than the speed threshold, if so, execute step S013;

S013, judging whether the opening degree of the accelerator pedal is greater than 0, if so, execute step S014;

S014 , judging whether the gear of the car is in the P gear or the N gear, if so, it is judged to be in the idling condition, and step S02 is executed.

In step S02 , the method for detecting whether the state of the battery is normal is to detect whether the sensor signal flag of the battery is valid, and if it is valid, it is determined that the state of the battery is normal; otherwise, it is determined that the state of the battery is abnormal. The method of detecting whether the state of the generator is normal is to detect whether the state communication signal of the generator can be received normally, and if so, it is determined that the state of the generator is normal, otherwise, it is determined that the state of the generator is abnormal.

Please refer to FIG. 6 , the present invention also provides a control device for an engine, which is used to implement the above-mentioned method for controlling the idle speed of the engine, including: a classification calculation activation judgment module 10, a load level determination module 20, and a rotation speed calculation module 30 and an engine speed adjustment module 40 . The classification calculation activation judging module 10 is used for judging whether to activate the engine idle classification calculation according to the electric quantity of the storage battery 50 and the load of the generator 60 when the engine is in an idle state. When the judgment result of the classification calculation activation judgment module 10 is yes, the load level determination module 20 acquires the discharge current of the storage battery, and determines the first current interval corresponding to the discharge current of the storage battery from a plurality of preset current intervals. The first electric load level corresponds to the first current interval, and the first electric load level is transmitted to the rotation speed calculation module 30, wherein a corresponding electric load level is set for each current interval. The rotation speed calculation module 30 calculates the target rotation speed of the engine at idle speed corresponding to the first electricity load level according to the first electricity load level, generator characteristics, and generator speed ratio, and the engine speed adjustment module 40 The current speed of the engine 70 is adjusted to the target speed under the idle state of the engine, so as to determine whether it is necessary to increase the speed of the engine 70 through the power of the battery 50, the load of the generator 60 and the discharge current I of the battery, and according to different users Targeted adjustment of the engine 70 speed for electrical loads and precise graded control can not only prevent the engine 70 idling speed from increasing too much and cause high fuel consumption, but also prevent the engine 70 idling speed from increasing too much and the generator 60 power generation still unable to meet the needs of the power load to ensure that the output of the generator 60 reaches a balance with the power consumption of the vehicle.

Preferably, as shown in FIG. 7, the hierarchical calculation activation judgment module 10 includes a first acquisition unit 11, a first judgment unit 12, a second acquisition unit 13, and a second judgment unit 14, and the first acquisition unit 11 is used to obtain The power of the storage battery 50 is transmitted to the first determination unit 12, and the first determination unit 12 compares the power of the storage battery 50 obtained by the first acquisition unit 11 with the power threshold to determine whether it is less than the power threshold. If the power of the battery 50 is less than the power threshold, Then send a signal to the second acquisition unit 13, the second acquisition unit 13 starts to acquire the load of the generator 60, and then transmits the acquired load of the generator 60 to the second determination unit 14, and the second determination unit 14 obtains the load according to the second acquisition unit 13 The load of the generator 60 is compared with the load threshold to determine whether it is greater than the load threshold. If the load of the generator 60 is greater than the load threshold, the second determination unit 14 sends a signal to the load level determination module 20 to activate the engine idle classification calculation.

As a preferred embodiment, the rotational speed calculation module 30 includes a first calculation unit 31 and a second calculation unit 32, the first calculation unit 31 receives the first electricity load level determined by the load level determination module 20, and According to the first power load level and generator characteristics, calculate the generator speed corresponding to the first power load level, use it as the generator target speed, and then transmit the generator target speed to the second calculation unit 32, the second The second calculation unit 32 divides the generator target speed ratio by the generator speed ratio to obtain the target speed of the engine at idle speed.

As a preferred solution, the control device further includes a correction module 80, and the correction module 80 is used to correct the target speed of the engine in an idle state. Specifically, it is used to execute the above steps S331 and S332. Preferably, the correction module 80 includes a first detection unit 81, a first storage unit 82, a first correction unit 83, a second storage unit 84, and a second correction unit 85, and the first detection unit 81 is used to detect the environment temperature or the water temperature in the water tank or the temperature of the generator 60 or the temperature of the storage battery 50, the first storage unit 82 is used to store a number of preset temperature ranges and their corresponding correction speeds, the first correction unit 83 receives the first The temperature detected by the detection unit 81 is compared with the preset temperature range stored in the first storage unit 82 to determine the corresponding corrected rotational speed, and the target rotational speed under the engine idle state is added to the corrected rotational speed to obtain a new engine idle speed state, the second correction unit 85 reads the stored resonance point speed from the second storage unit 84, and compares the target speed under the new engine idle state with the resonance point speed, and if the two are consistent, Then adjust the target speed in the idle state of the engine, and then transmit the adjusted target speed in the idle state of the engine to the engine speed adjustment module 40 .

Preferably, the control device further includes an idle state judging module 90, and the idle state judging module 90 is used for judging whether the engine is in an idle state. Further preferably, the idling state judging module 90 includes a third acquiring unit 91 , a third judging unit 92 , a fourth judging unit 94 , and a fifth judging unit 96 . The third acquiring unit 91 is used to acquire the current rotational speed of the engine 70. The third determining unit 92 determines whether the engine rotational speed acquired by the third acquiring unit 91 is greater than the rotational speed threshold. If the engine rotational speed is greater than the rotational speed threshold, the fourth acquiring unit 93 acquires the speed of the accelerator pedal. Opening degree, the fourth determining unit 94 judges whether the opening degree of the accelerator pedal obtained by the fourth obtaining unit 93 is greater than 0, and whether the opening degree of the accelerator pedal is greater than 0, the fifth obtaining unit 95 obtains the car gear, and the fifth determining unit 96 Judging whether the car gear is in the P or N gear, when it is in the P or N gear, it is judged to be in the idling condition.

Further, the idling state judging module 90 also includes a second detection unit 97 and a third detection unit 98, the second detection unit 97 is used to detect whether the sensor signal flag bit of the storage battery 50 is valid, and the third detection unit 98 is used to detect whether the status communication signal of the generator 60 can be received normally, and when the automobile is in an idling condition, and the detection results of the second detection unit 97 and the third detection unit 98 are normal, the classification calculation activation judgment module 10 is started .

Another aspect of this embodiment also provides a readable storage medium, the readable storage medium includes a stored computer program, wherein, when the computer program is running, the device where the readable storage medium is located can be controlled , execute the engine control method in the above embodiment.

It should be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In summary, the engine control method, control device, and readable storage medium of the present invention comprehensively judge the electricity demand through battery power, generator load, and battery discharge current, and determine whether to increase the engine idle speed, which avoids Increase the engine idle speed when it is not necessary to increase fuel consumption, and prevent the risk of power loss, which is more accurate and reasonable, and meets actual needs. Different battery discharge currents represent different electrical loads. The target speed of the engine at idle speed calculated through the battery discharge current, generator characteristics, and generator speed ratio can make the engine drive the generator to better match and adapt to different loads. Under the power load condition, accurate graded control can be realized, which can not only avoid the high fuel consumption caused by excessive engine idle speed increase, but also avoid the problem that the engine idle speed is not increased enough, and the power generation of the generator cannot meet the needs of the power load, ensuring that the generator The output is balanced with the power consumption of the whole vehicle, which has high application and promotion value.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (8)

1. A control method for an engine, comprising the steps of: When the engine is idle, judge whether to activate the engine idle classification calculation according to the battery power and generator load; If the judging result is active, the battery discharge current is obtained, and the first current interval corresponding to the battery discharge current is determined from a plurality of preset current intervals, so as to determine the first current interval corresponding to the first current interval. Electrical load level; among them, each current interval is set with a corresponding electrical load level; According to the first power load level, generator characteristics, and generator speed ratio, calculate the target speed of the engine at idle speed corresponding to the first power load level, so that the engine adjusts the current speed to The target speed under the idle state of the engine, the steps of which include: Obtain the ambient temperature or the water temperature in the water tank or the generator temperature or the battery temperature, and obtain several preset temperature ranges, each temperature range corresponds to a corrected speed; determine the preset temperature range that the obtained temperature value falls into, Adding the target rotational speed under the engine idle state and the corrected rotational speed to obtain a new target rotational speed under the engine idle state; Or, compare the magnitude of the resonance point speed with the new target speed in the idle state of the engine, and if the two are consistent, adjust the target speed in the idle state of the engine to avoid the resonance point speed. 2. The control method of the engine according to claim 1, characterized in that, when the engine is in an idle state, the step of judging whether to activate the engine idle classification calculation according to the battery power and the generator load comprises: When the engine is idling, obtain the battery power and generator load, and obtain the set power threshold and load threshold; Judging whether the battery power is less than the power threshold, and judging whether the generator load is greater than the load threshold; If the electric quantity of the storage battery is less than the electric quantity threshold and the load of the generator is greater than the load threshold, the engine idle speed classification calculation is activated. 3. The control method of the engine according to claim 1, characterized in that, before the step of judging whether to activate the calculation of the engine idle speed classification according to the electric quantity of the battery and the load of the generator when the engine is idle, the method further comprises the steps of: Detect whether the engine is in idling condition, if so, detect whether the state of the battery and the state of the engine are normal; If both the battery state and the engine state are normal, it is determined that the engine is in the idle state; Otherwise, it is determined that the engine is not in an idle state. 4. The control method of the engine according to claim 3, wherein the step of detecting whether the engine is in an idle state comprises: Get the current engine speed; Compare whether the current speed of the engine is greater than the speed threshold, and if so, determine whether the opening of the accelerator pedal is greater than 0; If the opening degree of the accelerator pedal is greater than 0, it is judged whether the car gear is in the P gear or the N gear; If the car gear is in the P or N gear, it is determined to be in the idling condition. 5. A control device for an engine, characterized in that it comprises: a classification calculation activation judgment module, a load level determination module, a speed calculation module, a correction module and an engine speed adjustment module; The classification calculation activation judgment module is used to judge whether to activate the engine idle classification calculation according to the battery power and generator load when the engine is in an idle state; The load level determination module is used to obtain the discharge current of the battery when the judgment result of the activation judgment module is yes, and determine the first current interval corresponding to the discharge current of the battery from a plurality of preset current intervals, so as to determine The first electricity load level corresponding to the first current interval; wherein, a corresponding electricity load level is set for each current interval; The rotation speed calculation module is used to calculate the target rotation speed of the engine in an idle state corresponding to the first electricity load level according to the current electricity load level, generator characteristics, and generator speed ratio; The correction module includes 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 to detect the ambient temperature or the water temperature in the water tank or the temperature of the generator or the battery; The first storage unit is used to store several preset temperature ranges and their corresponding corrected rotational speeds; The first correction unit is used to determine the preset temperature range that the temperature value obtained by the first detection unit falls into, and add the target speed under the engine idle state to the corrected speed to obtain a new engine idle state. target speed; The second storage unit is used to store the resonance point rotational speed; The second correction unit is used to compare whether the resonance point speed is consistent with the new target speed in the idle state of the engine, and if consistent, adjust the target speed in the idle state of the engine to avoid the resonance point speed; The engine speed adjustment module is used to adjust the current speed of the engine to the target speed in the idle state of the engine. 6. The control device according to claim 5, wherein the hierarchical calculation activation judging module comprises a first acquiring unit, a first judging unit, a second acquiring unit, and a second judging unit; The first acquisition unit is used to acquire battery power; The first judging unit is used to judge whether the battery power is less than a power threshold; The second acquisition unit is used to acquire generator load; The second judging unit is used for judging whether the generator load is greater than a load threshold when the electric quantity of the storage battery is less than the electric quantity threshold, and sending a signal for activating engine idle speed classification calculation when the judging result is yes. 7. The control device according to claim 5, wherein the control device further comprises an idle state judging module, and the idle state judging module is used to judge whether the engine is in an idle state; The idling state judging module is also used for: Get the current engine speed; Compare whether the current speed of the engine is greater than the speed threshold, and if so, determine whether the opening of the accelerator pedal is greater than 0; If the opening degree of the accelerator pedal is greater than 0, it is judged whether the car gear is in the P gear or the N gear; If the car gear is in the P or N gear, it is determined to be in the idling condition. 8. A readable storage medium, characterized in that the readable storage medium includes a stored computer program, wherein, when the computer program is running, the device where the readable storage medium is located can be controlled to execute the program according to claim 1. The control method of the engine described in any one of to 4.

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