CN114458411A - Engine control method and device, vehicle control unit and vehicle - Google Patents
Engine control method and device, vehicle control unit and vehicle Download PDFInfo
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- CN114458411A CN114458411A CN202011249764.6A CN202011249764A CN114458411A CN 114458411 A CN114458411 A CN 114458411A CN 202011249764 A CN202011249764 A CN 202011249764A CN 114458411 A CN114458411 A CN 114458411A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/005—Controlling temperature of lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/04—Diluting, e.g. with fuel
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- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
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Abstract
The disclosure relates to an engine control method and device, a vehicle control unit and a vehicle. The method comprises the following steps: acquiring the current water temperature of an engine of a vehicle in real time; if the current water temperature is smaller than a preset temperature threshold value and an automatic engine stop instruction is received, judging whether the engine is in a target state; if the engine is not in the target state, judging whether the current engine oil dilution amount of the engine is larger than a first preset dilution amount threshold value or not; and if the current engine oil dilution amount is larger than a first preset dilution amount threshold value, controlling the engine to enter a target state. Therefore, the engine can be warmed up smoothly to reach the fuel volatilization temperature, and the fuel mixed in the engine oil is volatilized to enter the engine to be combusted continuously. Therefore, the fuel utilization rate can be improved while the engine oil dilution rate of the engine is reduced, the problems of engine oil dilution aggravation caused by frequent cold start of the engine, cylinder drawing or tile drawing and the like of the engine are avoided, and the engine oil lubricating effect, reliability and service life of the engine are improved.
Description
Technical Field
The disclosure relates to the technical field of vehicles, in particular to an engine control method and device, a vehicle control unit and a vehicle.
Background
The cold weather engine is often operated in a cold state, which can cause engine oil dilution. The engine oil dilution refers to the phenomenon that when an engine cold machine with direct injection in a cylinder runs in a low-temperature environment, the temperature of a cylinder wall is low, oil injection atomization is poor, the cylinder wall is wet, and fuel oil (generally gasoline) attached to the cylinder wall enters a crankcase along an oil return hole of a piston in a compression stroke and flows into an oil pan to be mixed with the engine oil. The engine of the hybrid vehicle needs to drive the generator to generate power to charge the battery when the battery power is low, which may cause the engine to be frequently started and stopped. Repeated cold starts of the engine may result in increased oil dilution without completing engine warm-up. When the dilution rate of the engine oil is greater than a certain value, the problems of poor lubricating effect of the engine oil, engine bearing slip and the like can be caused.
Disclosure of Invention
In order to overcome the problems in the related art, the disclosure provides an engine control method, an engine control device, a vehicle control unit and a vehicle.
In order to achieve the above object, in a first aspect, the present disclosure provides an engine control method comprising:
acquiring the current water temperature of an engine of a vehicle in real time;
if the current water temperature is smaller than a preset temperature threshold value and an automatic engine stop instruction is received, judging whether the engine is in a target state, wherein the target state is a state of forbidding automatic stop, the automatic stop instruction is used for indicating the engine to stop driving a vehicle and a generator, the battery drives a driving motor to drive the vehicle, the generator is respectively connected with the engine and the battery, and the battery is connected with the driving motor;
if the engine is not in the target state, judging whether the current engine oil dilution amount of the engine is larger than a first preset dilution amount threshold value or not;
and if the current engine oil dilution amount is larger than a first preset dilution amount threshold value, controlling the engine to enter the target state.
Optionally, the method further comprises:
if the engine is not in the target state and the current engine oil dilution amount is less than or equal to the first preset dilution amount threshold value, controlling the engine to be automatically stopped in a delayed mode;
and when the current water temperature reaches the preset temperature threshold, determining a first target time length for the engine to continue to delay the automatic stop, and controlling the engine to stop after the first target time length.
Optionally, the determining a first target period for which the engine is to continue to delay the automatic stop comprises:
determining a second target time length for continuously delaying automatic stop of the engine according to the current engine oil dilution amount and a preset fuel oil volatilization rate;
if the second target duration is longer than a preset duration, determining the preset duration as the first target duration;
and if the second target duration is less than or equal to the preset duration, determining the second target duration as the first target duration.
Optionally, the method further comprises:
and if the engine is detected to be stopped in the first target time length, or the second target time length is longer than the preset time length, storing the residual engine oil dilution amount when the engine is stopped.
Optionally, the method further comprises:
if the engine is in the target state, judging whether the current engine oil dilution amount of the engine is smaller than a second preset dilution amount threshold value, wherein the second preset dilution amount threshold value is smaller than or equal to the first preset dilution amount threshold value;
if the current engine oil dilution amount of the engine is larger than or equal to the second preset dilution amount threshold, repeatedly executing the step of judging whether the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold until the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold, and then controlling the engine to stop.
Optionally, the method further comprises:
and when the engine is started, if the current engine oil dilution amount of the engine is larger than the second preset dilution amount threshold value, controlling the engine to enter the target state.
Optionally, the current oil dilution amount of the engine is obtained by:
acquiring the current engine oil dilution amount of the engine through an engine oil level sensor; or
Acquiring the water temperature of the engine at the time of starting and the running time length of the engine after starting; and determining the current engine oil dilution amount of the engine according to the water temperature of the engine when the engine is started, the current water temperature, the corresponding relation between the preset dilution rate and the temperature interval, the running time and the remaining engine oil dilution amount of the engine when the engine is stopped for the last time.
In a second aspect, the present disclosure provides an engine control apparatus comprising:
the acquisition module is used for acquiring the current water temperature of an engine of the vehicle in real time;
the first judgment module is used for judging whether the engine is in a target state or not if the current water temperature acquired by the acquisition module is smaller than a preset temperature threshold and an automatic engine stop instruction is received, wherein the target state is a state in which automatic stop is forbidden, the automatic stop instruction is used for indicating the engine to stop driving a vehicle and a generator, the battery drives a driving motor to drive the vehicle, the generator is respectively connected with the engine and the battery, and the battery is connected with the driving motor;
the second judgment module is used for judging whether the current engine oil dilution amount of the engine is larger than a first preset dilution amount threshold value or not if the first judgment module judges that the engine is not in the target state;
and the control module is used for controlling the engine to enter the target state if the second judging module judges that the current engine oil dilution is greater than a first preset dilution threshold value.
In a third aspect, the present disclosure provides a vehicle control unit, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory, the steps of the method provided in the first aspect of the disclosure.
In a fourth aspect, the present disclosure provides a vehicle comprising:
the system comprises a generator, an engine, a battery, a vehicle control unit and a driving motor;
the generator is respectively connected with the battery and the engine and is used for generating power under the driving of the engine so as to charge the battery;
the battery is connected with the driving motor and is used for driving the driving motor to drive the vehicle;
and the vehicle control unit is connected with the engine, wherein the vehicle control unit is the vehicle control unit provided by the third aspect of the disclosure.
In the technical scheme, under the condition that the current water temperature of the engine is smaller than a preset temperature threshold and an automatic engine stop instruction is received, whether the engine is in a target state (namely, a state of forbidding automatic stop) is judged; and if the engine is not in the state of forbidding automatic stop and the current engine oil dilution amount of the engine is greater than the first preset dilution amount threshold value, controlling the engine to enter the state of forbidding automatic stop. Therefore, the engine can be warmed up smoothly to reach the volatilization temperature of the fuel, so that the fuel mixed in the engine oil of the engine volatilizes and enters the engine to be combusted continuously. From this, can promote the fuel utilization ratio when reducing engine machine oil dilution rate to avoid the problem that the machine oil that the frequent cold quick-witted start engine of vehicle leads to dilutes the aggravation, and then promoted the lubricated effect of engine machine oil, can avoid the engine to appear drawing the jar simultaneously, draw the tile scheduling problem, promoted the reliability and the life of engine.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a vehicle according to an exemplary embodiment.
FIG. 2 is a flow chart illustrating an engine control method according to an exemplary embodiment.
FIG. 3 is a flow chart illustrating an engine control method according to another exemplary embodiment.
FIG. 4 is a flowchart illustrating an engine control method according to another exemplary embodiment.
FIG. 5 is a block diagram illustrating an engine control apparatus according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
FIG. 1 is a schematic diagram of a vehicle according to an exemplary embodiment. As shown in fig. 1, the vehicle includes a generator 1, an engine 2, a battery 3, a vehicle control unit 4, and a drive motor 5.
In the present disclosure, the vehicle may be a hybrid vehicle. The generator 1 is connected to the battery 3 and the engine 2, and generates power to charge the battery 3 by driving the engine 2. And the battery 3 is connected with the driving motor 5 and is used for driving the driving motor 5 to drive the vehicle. And the vehicle control unit 4 is connected with the engine 2 and used for controlling the engine 2 to run so as to solve the problem of engine oil dilution aggravation caused by frequent cold start of the engine by the vehicle. Specifically, the vehicle control unit 4 may implement the engine control through S201 to S206 shown in fig. 2.
In S201, the current water temperature of the engine of the vehicle is acquired in real time.
In the disclosure, the current water temperature of the engine can be acquired in real time through the water temperature sensor arranged on the engine, so that the vehicle control unit can acquire the current water temperature of the engine in real time through the water temperature sensor.
In S202, it is determined whether the current water temperature of the engine is less than a preset temperature threshold.
If the current water temperature of the engine is less than the preset temperature threshold (for example, 70 ℃), it indicates that the engine oil temperature is low (here, the current water temperature of the engine is used to represent the engine oil temperature), and at this time, S203 is executed; if the current water temperature of the engine is larger than or equal to the preset temperature threshold value, the fact that the oil temperature of the engine reaches the volatilization temperature of the fuel oil is indicated, so that the fuel oil mixed in engine oil of the engine volatilizes and enters the engine to be continuously combusted, the dilution of the engine oil is relieved, and at the moment, any operation is not executed, namely the operation is finished.
In S203, it is determined whether an engine automatic stop instruction is received.
In the present disclosure, the auto stop command is used to instruct the engine to stop driving the vehicle and the generator (i.e., the engine stops working), and the battery drives the driving motor to drive the vehicle. When the battery charging of the vehicle is completed, the battery management system may send an instruction (i.e., an automatic stop instruction) for instructing the engine to automatically stop to the vehicle control unit, and the vehicle control unit receives the automatic stop instruction.
Under the condition that the current water temperature of the engine is smaller than the preset temperature threshold value, if the engine is stopped, the engine cannot be warmed up, and therefore the oil temperature of the engine cannot reach the volatilization temperature of fuel oil, so that the fuel oil mixed in engine oil of the engine cannot be volatilized to enter the engine to be combusted continuously, and the engine oil dilution is intensified. For this reason, under the condition that the current water temperature of the engine is smaller than the preset temperature threshold, if an engine automatic stop instruction is received, S204 is executed; and under the condition that the current water temperature of the engine is smaller than the preset temperature threshold, if the automatic engine stop instruction is not received, continuously monitoring whether the current water temperature of the engine is smaller than the preset temperature threshold, namely returning to the step S202.
In S204, it is determined whether the engine is in the target state.
In the present disclosure, the target state is a state in which automatic stop is prohibited. While the engine is in the target state: if the vehicle control unit receives the automatic stop command, the automatic stop of the engine is forbidden, namely the engine is kept to continue running; and if the vehicle control unit receives an engine stop instruction triggered by a user, controlling the engine to stop.
If the engine is in the target state, the engine can be smoothly warmed up to reach the volatilization temperature of the fuel, the fuel mixed in the engine oil of the engine is volatilized to enter the engine to be continuously combusted, the dilution of the engine oil is relieved, and at the moment, any operation can be not executed, namely the operation is finished. If the engine is not in the target state, S205 is executed.
In S205, it is determined whether the current engine oil dilution amount of the engine is greater than a first preset dilution amount threshold.
In the present disclosure, if the current engine oil dilution amount of the engine is less than or equal to the first preset dilution amount threshold, it indicates that the current engine oil dilution amount of the engine is relatively low, and at this time, the current engine oil dilution amount of the engine may be continuously monitored, that is, the process returns to S205; if the current engine oil dilution amount of the engine is greater than the first preset dilution amount threshold, it indicates that the current engine oil dilution amount of the engine is relatively high, and at this time, S206 may be executed to reduce the current engine oil dilution amount of the engine.
In S206, the engine is controlled to enter the target state.
In the technical scheme, under the condition that the current water temperature of the engine is smaller than a preset temperature threshold and an automatic engine stop instruction is received, whether the engine is in a target state (namely, a state of forbidding automatic stop) is judged; and if the engine is not in the state of forbidding automatic stop and the current engine oil dilution amount of the engine is greater than the first preset dilution amount threshold value, controlling the engine to enter the state of forbidding automatic stop. Therefore, the engine can be warmed up smoothly to reach the volatilization temperature of the fuel, so that the fuel mixed in the engine oil is volatilized and enters the engine to be combusted continuously. From this, can promote fuel utilization ratio when reducing engine machine oil dilution rate to avoid the problem that the machine oil dilution aggravation that the cold quick-witted start engine of vehicle leads to, and then promoted the lubricated effect of engine machine oil, can avoid the engine to appear drawing the jar simultaneously, draw the tile scheduling problem, promoted the reliability and the life of engine.
The manner of acquiring the current oil dilution amount of the engine in S205 will be described in detail below.
In an implementation mode, the current engine oil liquid level of the engine can be detected in real time through an engine oil liquid level sensor arranged on the engine, so that the vehicle control unit can obtain the current engine oil liquid level of the engine through the engine oil liquid level sensor, and then the current engine oil dilution quantity of the engine can be determined according to the difference value of the current engine oil liquid level and the preset engine oil liquid level. By the implementation mode, the current engine oil dilution amount of the engine can be conveniently and quickly acquired.
In another embodiment, the water temperature of the engine at the time of the next start and the running time period of the engine after the next start may be obtained; and then, determining the current engine oil dilution amount of the engine according to the water temperature of the engine when the engine is started, the current water temperature, the corresponding relation between the preset dilution rate and the temperature interval, the running time and the residual engine oil dilution amount when the engine is stopped for the last time.
Specifically, the temperature range from the water temperature at the time of the next start to the current water temperature may be divided into a plurality of target temperature intervals according to the temperature intervals in the correspondence relationship; then, aiming at each target temperature interval, determining a target dilution rate corresponding to the target temperature interval according to a preset corresponding relation between the dilution rate and the temperature interval, simultaneously obtaining the time length of the water temperature of the engine rising from the lower limit value of the target temperature interval to the upper limit value of the target temperature interval, and then determining the engine oil dilution variation corresponding to the target temperature interval by multiplying the time length by the target dilution rate corresponding to the target temperature interval. In this way, the total of the engine oil dilution variation amounts corresponding to the respective target temperature ranges can be added to the remaining engine oil dilution amount when the engine was last stopped, so as to obtain the current engine oil dilution amount of the engine. Therefore, the current engine oil dilution amount of the engine can be quickly obtained without additionally arranging an engine oil level sensor, and the cost is saved.
For example, the water temperature at the current start of the engine is 25 ℃, the current water temperature is 55 ℃, the preset corresponding relationship between the dilution rate and the temperature interval is shown in the following table 1, the operation time is t, and the remaining engine oil dilution amount at the latest stop of the engine is a.
Thus, the temperature range from 25 ℃ of the water temperature at the time of the next start to 55 ℃ of the current water temperature can be divided into two target temperature ranges [25 ℃, 40 ℃) and [40 ℃, 55 ℃) according to the temperature ranges in the corresponding relationship in the above table 1; then, for a target temperature interval [25 ℃, 40 ℃), according to a preset corresponding relationship between the dilution rate and the temperature interval shown in table 1, a target dilution rate corresponding to the target temperature interval [25 ℃, 40 ℃) can be determined to be V1, meanwhile, a time length of the water temperature of the engine rising from 25 ℃ to 40 ℃ is obtained to be t1, and then, an engine oil dilution variation corresponding to the target temperature interval [25 ℃, 40 ℃) is determined by multiplying the time length t1 by the target dilution rate V1 corresponding to the target temperature interval [25 ℃, 40 ℃), namely the engine oil dilution variation corresponding to the target temperature interval [25 ℃, 40 ℃) is V1 × t 1; for a target temperature interval [40 ℃, 55 ℃), according to the preset corresponding relationship between the dilution rate and the temperature interval shown in table 1, the target dilution rate corresponding to the target temperature interval [40 ℃, 55 ℃) can be determined to be V2, meanwhile, the time length of the water temperature of the engine rising from 40 ℃ to 55 ℃ is t2 (wherein, the running time length t is equal to t1+ t2), and then the engine oil dilution variation corresponding to the target temperature interval [40 ℃, 55 ℃) is determined by the product of the time length t2 and the target dilution rate V2 corresponding to the target temperature interval [40 ℃, 55 ℃), namely the engine oil dilution variation corresponding to the target temperature interval [40 ℃, 55 ℃) is V2 × t 2; thus, the current oil dilution amount of the engine is a + V1 × t1+ V2 × t 2.
TABLE 1 Table of correspondence between preset dilution rate and temperature range
| Temperature interval | Rate of dilution |
| …… | …… |
| [15℃，40℃) | V1 |
| [40℃，60℃) | V2 |
| …… | …… |
Wherein V1 is more than V2.
In addition, the vehicle control unit can acquire the current engine oil dilution amount and store the engine oil dilution amount to the corresponding storage module when the engine is stopped every time. Therefore, when the current engine oil dilution amount of the engine is determined, the residual engine oil dilution amount of the engine during the last stop of the engine can be obtained by accessing the storage module.
FIG. 3 is a flow chart illustrating an engine control method according to another exemplary embodiment. As shown in fig. 3, the method further includes S207 and S208.
In S207, the engine is controlled to delay the automatic stop.
In this disclosure, under the condition that the current water temperature of the engine is less than the preset temperature threshold, if the engine is stopped, the engine warming-up cannot be completed, so that the engine oil temperature cannot reach the volatilization temperature of the fuel oil, and the fuel oil mixed in the engine oil of the engine cannot volatilize and enter the engine to be continuously combusted, thereby exacerbating the engine oil dilution. For this reason, when it is determined in S205 that the current oil dilution amount of the engine is less than or equal to the first preset dilution amount threshold, the engine is controlled to delay the automatic stop (i.e., S207 is executed) to complete the engine warm-up.
In S208, when the current water temperature of the engine reaches a preset temperature threshold value, a first target time length for the engine to continue to delay the automatic stop is determined, and the engine is controlled to stop after the first target time length.
In the disclosure, when the current water temperature of the engine reaches a preset temperature threshold, it indicates that the engine warming-up is completed, that is, the oil temperature of the engine reaches the volatilization temperature of the fuel oil, so that the fuel oil mixed in the engine oil of the engine can volatilize and enter the engine to continue to burn, and at this time, the engine can be controlled to continue to delay the automatic stop for the first target time length. The method comprises the steps of controlling the engine to be in a state of forbidding automatic stop within a first target time period after the current water temperature of the engine reaches a preset temperature threshold, and then controlling the engine to stop. In this way, the fuel mixed in the engine oil can be sufficiently volatilized to enter the engine to continue combustion, so that the engine oil dilution rate is further reduced.
The following is a detailed description of the specific embodiment of determining the first target period for which the engine is to continue to be delayed from the automatic stop in S208 described above.
In one embodiment, the first target duration may be a preset duration.
In another embodiment, a second target time length for continuously delaying automatic stop of the engine is determined according to the current engine oil dilution amount and a preset fuel volatilization rate, wherein the second target time length is equal to the current engine oil dilution amount divided by the preset fuel volatilization rate; if the second target duration of the engine is longer than the preset duration, determining the preset duration as the first target duration; and if the second target duration is less than or equal to the preset duration, determining the second target duration as the first target duration.
In addition, the above method further comprises the steps of: and if the engine is detected to be stopped within the first target time length or the second target time length is longer than the preset time length, storing the residual engine oil dilution amount when the engine is stopped. Therefore, when the current engine oil dilution amount of the engine is determined, the residual engine oil dilution amount of the engine which is stopped for the last time can be obtained by accessing the corresponding storage module, and the current engine oil dilution amount of the engine can be rapidly determined.
In the disclosure, in the process of controlling the engine to delay the automatic stop for the first target time period in S208, the vehicle controller may receive an engine stop command triggered by a user, and at this time, the engine is stopped, so that the fuel mixed in the engine oil is not sufficiently volatilized and enters the engine to continue to be combusted, and at this time, the dilution amount of the remaining engine oil when the engine is stopped may be determined and stored.
Wherein the remaining oil dilution amount at the time of engine stop may be determined by: firstly, determining the actual running time of an engine after the current water temperature of the engine reaches a preset temperature threshold, namely the time from the shutdown of the engine to the time when the current water temperature of the engine reaches the preset temperature threshold; then, determining the reduction amount of the engine oil dilution amount by multiplying the actual operation time length by the preset fuel oil volatilization rate; and finally, determining the difference value between the engine oil dilution amount when the current water temperature of the engine reaches a preset temperature threshold value and the reduction amount as the residual engine oil dilution amount when the engine is stopped.
In addition, if the second target time length is longer than the preset time length, the time length required by the engine to continuously delay the automatic stop is longer than the preset time length, and the vehicle control unit controls the engine to continuously delay the automatic stop for the preset time length at the moment, so that fuel oil mixed in engine oil of the engine is not fully volatilized and enters the engine to continuously burn, and at the moment, the dilution quantity of the residual engine oil when the engine stops can be obtained and stored.
Wherein the remaining oil dilution amount at the time of engine shutdown may be determined by: firstly, determining the product of a preset duration and a preset fuel oil volatilization rate as the reduction amount of the engine oil dilution amount; and then, determining the difference value between the engine oil dilution amount when the current water temperature of the engine reaches the preset temperature threshold value and the reduction amount as the residual engine oil dilution amount when the engine is stopped.
FIG. 4 is a flowchart illustrating an engine control method according to another exemplary embodiment. As shown in fig. 4, the method further includes S209 and S210.
In S209, it is determined whether the current engine oil dilution amount of the engine is less than a second preset dilution amount threshold.
In the present disclosure, if it is determined in the above step S204 that the engine is in the target state, it is determined whether the current engine oil dilution amount of the engine is smaller than a second preset dilution amount threshold (i.e., S209) which is smaller than or equal to the first preset dilution amount threshold.
If the current engine oil dilution amount of the engine is smaller than a second preset dilution amount threshold value, it is indicated that the fuel oil mixed in the engine oil of the engine is fully volatilized, that is, the engine oil dilution rate of the engine reaches an ideal value, and at this time, in order to save oil consumption, S210 is executed; if the current engine oil dilution amount of the engine is greater than or equal to the second preset dilution amount threshold, continuously monitoring whether the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold, namely returning to S209 until the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold.
In S210, the engine is controlled to stop.
Furthermore, the above method may further include the steps of:
when the engine is started, if the current engine oil dilution amount of the engine is larger than a second preset dilution amount threshold value, the engine is controlled to enter a target state (namely, a state of forbidding automatic stop), so that the engine oil dilution amount of the engine can be adjusted to a proper range at the first time, and the problems of cylinder scuffing, bearing scuffing and the like of the engine are avoided. In addition, after the engine enters the target state, whether the current engine oil dilution amount of the engine is smaller than a second preset dilution amount threshold value or not can be continuously monitored until the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold value, and then the engine is controlled to stop.
FIG. 5 is a block diagram illustrating an engine control apparatus according to an exemplary embodiment. As shown in fig. 5, the apparatus 500 includes: the acquiring module 501 is used for acquiring the current water temperature of an engine of a vehicle in real time; a first determining module 52, configured to determine whether the engine is in a target state if the current water temperature obtained by the obtaining module 501 is smaller than a preset temperature threshold and an engine auto-stop instruction is received, where the target state is a state in which auto-stop is prohibited, the auto-stop instruction is used to instruct the engine to stop driving a vehicle and a generator, the battery drives a driving motor to drive the vehicle, the generator is respectively connected to the engine and the battery, and the battery is connected to the driving motor; a second determining module 503, configured to determine whether a current engine oil dilution amount of the engine is greater than a first preset dilution amount threshold if the first determining module 502 determines that the engine is not in the target state; and a control module 504, configured to control the engine to enter the target state if the second determining module 503 determines that the current engine oil dilution amount is greater than a first preset dilution amount threshold.
In the technical scheme, under the condition that the current water temperature of the engine is smaller than a preset temperature threshold and an automatic engine stop instruction is received, whether the engine is in a target state (namely, a state of forbidding automatic stop) is judged; and if the engine is not in the state of forbidding automatic stop and the current engine oil dilution amount of the engine is greater than the first preset dilution amount threshold value, controlling the engine to enter the state of forbidding automatic stop. Therefore, the engine can be warmed up smoothly to reach the volatilization temperature of the fuel, so that the fuel mixed in the engine oil of the engine volatilizes and enters the engine to be combusted continuously. From this, can promote fuel utilization ratio when reducing engine machine oil dilution rate to avoid the problem that the machine oil dilution aggravation that the cold quick-witted start engine of vehicle leads to, and then promoted the lubricated effect of engine machine oil, can avoid the engine to appear drawing the jar simultaneously, draw the tile scheduling problem, promoted the reliability and the life of engine.
Optionally, the control module 504 is further configured to: if the engine is not in the target state and the current engine oil dilution amount is smaller than or equal to the first preset dilution amount threshold value, controlling the engine to be automatically stopped in a delayed mode; and when the current water temperature reaches the preset temperature threshold, determining a first target time length for the engine to continue to delay the automatic stop, and controlling the engine to stop after the first target time length.
Optionally, the control module 504 includes: the first determining submodule is used for determining a second target time length for continuously delaying automatic stop of the engine according to the current engine oil dilution amount and a preset fuel oil volatilization rate; a second determination submodule for: if the second target duration is longer than a preset duration, determining the preset duration as the first target duration; and if the second target duration is less than or equal to the preset duration, determining the second target duration as the first target duration.
Optionally, the apparatus 500 further comprises: and the storage module is used for storing the residual engine oil dilution amount when the engine is stopped if the engine is detected to be stopped in the first target time length or the second target time length is greater than the preset time length.
Optionally, the apparatus 500 further comprises: the third judging module is used for judging whether the current engine oil dilution amount of the engine is smaller than a second preset dilution amount threshold value or not if the engine is in the target state, wherein the second preset dilution amount threshold value is smaller than or equal to the first preset dilution amount threshold value; the control module 504 is further configured to trigger the third determination module to repeatedly execute the step of determining whether the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold value if the current engine oil dilution amount of the engine is greater than or equal to the second preset dilution amount threshold value, until the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold value, and then control the engine to stop.
Optionally, the control module 504 is further configured to, when the engine is started, control the engine to enter the target state if the current engine oil dilution amount of the engine is greater than the second preset dilution amount threshold.
Optionally, the second determining module 503 obtains the current oil dilution amount of the engine by: acquiring the current engine oil dilution amount of the engine through an engine oil level sensor; or acquiring the water temperature of the engine at the time of starting and the running time length of the engine after starting; and determining the current engine oil dilution amount of the engine according to the water temperature of the engine when the engine is started, the current water temperature, the corresponding relation between the preset dilution rate and the temperature interval, the running time and the remaining engine oil dilution amount of the engine when the engine is stopped for the last time.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a vehicle control unit, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the above-described engine control method provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. To avoid unnecessary repetition, the disclosure does not separately describe various possible combinations.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. An engine control method characterized by comprising:
acquiring the current water temperature of an engine of a vehicle in real time;
if the current water temperature is smaller than a preset temperature threshold value and an automatic engine stop instruction is received, judging whether the engine is in a target state, wherein the target state is a state of forbidding automatic stop, the automatic stop instruction is used for indicating the engine to stop driving a vehicle and a generator, the battery drives a driving motor to drive the vehicle, the generator is respectively connected with the engine and the battery, and the battery is connected with the driving motor;
if the engine is not in the target state, judging whether the current engine oil dilution amount of the engine is larger than a first preset dilution amount threshold value or not;
and if the current engine oil dilution amount is larger than a first preset dilution amount threshold value, controlling the engine to enter the target state.
2. The method of claim 1, further comprising:
if the engine is not in the target state and the current engine oil dilution amount is smaller than or equal to the first preset dilution amount threshold value, controlling the engine to be automatically stopped in a delayed mode;
and when the current water temperature reaches the preset temperature threshold, determining a first target time length for the engine to continue to delay the automatic stop, and controlling the engine to stop after the first target time length.
3. The method of claim 2, wherein the determining the first target period for which the engine is to continue to delay the automatic stop comprises:
determining a second target time length for continuously delaying automatic stop of the engine according to the current engine oil dilution amount and a preset fuel oil volatilization rate;
if the second target duration is longer than a preset duration, determining the preset duration as the first target duration;
and if the second target duration is less than or equal to the preset duration, determining the second target duration as the first target duration.
4. The method of claim 3, further comprising:
and if the engine is detected to be stopped in the first target time length, or the second target time length is longer than the preset time length, storing the residual engine oil dilution amount when the engine is stopped.
5. The method of claim 1, further comprising:
if the engine is in the target state, judging whether the current engine oil dilution amount of the engine is smaller than a second preset dilution amount threshold value, wherein the second preset dilution amount threshold value is smaller than or equal to the first preset dilution amount threshold value;
if the current engine oil dilution amount of the engine is larger than or equal to the second preset dilution amount threshold, repeatedly executing the step of judging whether the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold until the current engine oil dilution amount of the engine is smaller than the second preset dilution amount threshold, and then controlling the engine to stop.
6. The method of claim 5, further comprising:
and when the engine is started, if the current engine oil dilution amount of the engine is larger than the second preset dilution amount threshold value, controlling the engine to enter the target state.
7. The method according to any one of claims 1-6, characterized in that the current oil dilution of the engine is obtained by:
acquiring the current engine oil dilution amount of the engine through an engine oil level sensor; or
Acquiring the water temperature of the engine at the time of starting and the running time length of the engine after starting; and determining the current engine oil dilution amount of the engine according to the water temperature of the engine when the engine is started, the current water temperature, the corresponding relation between the preset dilution rate and the temperature interval, the running time and the remaining engine oil dilution amount of the engine when the engine is stopped for the last time.
8. An engine control apparatus characterized by comprising:
the acquisition module is used for acquiring the current water temperature of an engine of the vehicle in real time;
the first judgment module is used for judging whether the engine is in a target state or not if the current water temperature acquired by the acquisition module is smaller than a preset temperature threshold and an automatic engine stop instruction is received, wherein the target state is a state in which automatic stop is forbidden, the automatic stop instruction is used for indicating the engine to stop driving a vehicle and a generator, the battery drives a driving motor to drive the vehicle, the generator is respectively connected with the engine and the battery, and the battery is connected with the driving motor;
the second judgment module is used for judging whether the current engine oil dilution amount of the engine is larger than a first preset dilution amount threshold value or not if the first judgment module judges that the engine is not in the target state;
and the control module is used for controlling the engine to enter the target state if the second judging module judges that the current engine oil dilution is greater than a first preset dilution threshold value.
9. A vehicle control unit, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 7.
10. A vehicle, characterized by comprising:
the system comprises a generator, an engine, a battery, a vehicle control unit and a driving motor;
the generator is respectively connected with the battery and the engine and is used for generating power under the driving of the engine so as to charge the battery;
the battery is connected with the driving motor and is used for driving the driving motor to drive the vehicle;
a vehicle control unit connected to the engine, wherein the vehicle control unit is the vehicle control unit according to claim 9.
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| CN202011249764.6A CN114458411B (en) | 2020-11-10 | 2020-11-10 | Engine control method and device, vehicle control unit and vehicle |
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| CN202011249764.6A CN114458411B (en) | 2020-11-10 | 2020-11-10 | Engine control method and device, vehicle control unit and vehicle |
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