CN116331183A - Rotating speed control method and device and electronic control unit - Google Patents
Rotating speed control method and device and electronic control unit Download PDFInfo
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- CN116331183A CN116331183A CN202310581936.7A CN202310581936A CN116331183A CN 116331183 A CN116331183 A CN 116331183A CN 202310581936 A CN202310581936 A CN 202310581936A CN 116331183 A CN116331183 A CN 116331183A
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- 238000000034 method Methods 0.000 title claims abstract description 85
- 239000000110 cooling liquid Substances 0.000 claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000000295 fuel oil Substances 0.000 claims abstract description 9
- 238000004590 computer program Methods 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract description 75
- 230000007613 environmental effect Effects 0.000 abstract description 12
- 230000001276 controlling effect Effects 0.000 description 19
- 239000004606 Fillers/Extenders Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 8
- 239000002826 coolant Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—Engine torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0688—Engine temperature
Abstract
The invention provides a rotating speed control method, a rotating speed control device and an electronic control unit, wherein the rotating speed control method comprises the following steps: when a starting instruction is received, controlling the fuel heater to heat the temperature of cooling liquid in the engine body; when the temperature of the cooling liquid reaches a preset temperature, acquiring the engine temperature of the engine; and adjusting the target dragging torque for controlling the engine speed based on the engine temperature and the speed change preset value. In the embodiment of the invention, the environmental condition of the whole methanol range-extending vehicle is not considered, and after a starting signal is received, the temperature of the cooling liquid is increased in a heating mode of the fuel oil heater so as to eliminate the influence of the environmental temperature on the starting process of the methanol engine; dragging the engine by using a first dragging torque matched with the temperature of the engine; the first dragging torque is adjusted to reasonably control the rotating speed of the methanol range-extended whole vehicle in the starting process, so that the problem of influencing the rotating speed stability of the engine in the starting process is avoided.
Description
Technical Field
The present invention relates to the field of automotive technologies, and in particular, to a method and an apparatus for controlling rotational speed, and an electronic control unit.
Background
The range extender system is added on the basis of the pure electric vehicle, and the range extender can supplement the electric energy of the power battery to achieve the effect of increasing the endurance mileage of the electric vehicle.
When the whole vehicle is started, the methanol range-extended type vehicle generally adopts auxiliary starting measures such as gasoline starting and the like to output target dragging torque to control the engine. In the starting process, under the influence of factors such as friction resistance, engine oil viscosity and the like, the rising rate of the engine speed is different under the same dragging torque. Meanwhile, under the same engine rotation speed, the difference of the rotation speed change rate influences the target dragging torque value of the generator, and the conditions of overlarge setting, overlarge setting and the like of the target dragging torque value of the generator exist; thereby affecting the rotational speed stability during engine starting.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a method, an apparatus, and an electronic control unit for controlling a rotational speed, so as to solve the problem in the prior art that the rotational speed stability of an engine in a starting process is affected.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a first aspect of an embodiment of the present invention shows a rotational speed control method, including:
when a starting instruction is received, controlling the fuel heater to heat the temperature of cooling liquid in the engine body;
when the temperature of the cooling liquid reaches a preset temperature, acquiring the engine temperature of the engine;
determining a first motoring torque that matches the engine temperature to drag an engine based on the first motoring torque;
acquiring a first rotating speed of the engine;
calculating based on the current first rotating speed and the first rotating speed of the last unit time to obtain a first rotating speed change rate;
and adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque.
Optionally, the adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque includes:
triggering a step-down strategy when the first rotating speed change rate is determined to exceed a rotating speed change preset value;
calculating a first ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
and controlling the first dragging torque to execute a grading reduction strategy according to the first proportion, so as to obtain a target dragging torque.
Optionally, the adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque includes:
triggering a step-up strategy when the first rotating speed change rate is determined not to exceed a rotating speed change preset value;
calculating a second ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
and controlling the first dragging torque to execute a step-up strategy according to the second proportion, so as to obtain the target dragging torque.
Optionally, the method further comprises:
and judging whether the first rotating speed change rate is a positive value or not before determining that the first rotating speed change rate exceeds a rotating speed change preset value or not.
Optionally, the method further comprises:
judging whether the first rotating speed reaches a target idle speed or not, and judging whether the first rotating speed change rate is in a target range or not;
and stopping dragging the engine when the first rotation speed reaches the target idle speed and the first rotation speed change rate is in the target range.
Optionally, the method further comprises:
when the temperature of the cooling liquid reaches the preset temperature, determining whether the current whole vehicle state of the automobile meets the starting requirement.
A second aspect of an embodiment of the present invention shows a rotational speed control apparatus, the apparatus including:
the heating module is used for controlling the fuel oil heater to heat the temperature of the cooling liquid in the engine body when receiving a starting instruction;
the acquisition module is used for acquiring the engine temperature of the engine when the temperature of the cooling liquid reaches a preset temperature;
an adjustment module to determine a first motoring torque that matches the engine temperature to drag an engine based on the first motoring torque; acquiring a first rotating speed of the engine; calculating based on the current first rotating speed and the first rotating speed of the last unit time to obtain a first rotating speed change rate; and adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque.
Optionally, the method further comprises:
and the determining module is used for determining whether the current whole vehicle state of the automobile meets the starting requirement or not when the temperature of the cooling liquid reaches the preset temperature.
A third aspect of an embodiment of the present invention shows an electronic control unit comprising: a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the rotational speed control method according to any one of the first aspect of the embodiments of the present invention.
Based on the above method and device for controlling rotational speed and the electronic control unit provided by the embodiments of the present invention, the method includes: when a starting instruction is received, controlling the fuel heater to heat the temperature of cooling liquid in the engine body; when the temperature of the cooling liquid reaches a preset temperature, acquiring the engine temperature of the engine; and adjusting the target dragging torque for controlling the engine speed based on the engine temperature and the speed change preset value. In the embodiment of the invention, the environmental condition of the whole methanol range-extending vehicle is not considered, and after a starting signal is received, the temperature of the cooling liquid is increased in a heating mode of the fuel oil heater so as to eliminate the influence of the environmental temperature on the starting process of the methanol engine; dragging the engine by using a first dragging torque matched with the temperature of the engine; the first dragging torque is adjusted to reasonably control the rotating speed of the methanol range-extended whole vehicle in the starting process, so that the problem of influencing the rotating speed stability of the engine in the starting process is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an engine control unit, a methanol range extender, a range extender control unit, a vehicle control unit, a fuel heater control unit and an electronic control unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a rotational speed control architecture according to an embodiment of the present invention;
fig. 3 is a flow chart of a rotational speed control method according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of adjusting engine dragging torque according to an embodiment of the present invention;
FIG. 5 is a flow chart of another method for controlling rotational speed according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a rotational speed control apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another rotational speed control apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims of this application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the description of "first", "second", etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Referring to fig. 1, a schematic diagram of an engine control unit, a methanol range extender, a range extender control unit, a vehicle control unit, a fuel heater control unit, and an electronic control unit according to an embodiment of the present invention is shown.
The electronic control unit 500 includes an engine control unit 101, a range extender control unit 201, a whole vehicle control unit 301, and a fuel heater control unit 401.
The engine 100 is connected to the engine control unit 101, the methanol range extender 200 is connected to the range extender control unit 201, and the fuel heater 400 is connected to the fuel heater control unit 401. Wherein the engine 100 is directly connected to the generator 600.
The fuel heater control unit 401 is connected with the whole vehicle control unit 301, the whole vehicle control unit 301 is connected with the range extender control unit 201, and the range extender control unit 201 is connected with the engine control unit 101.
The device is arranged in a methanol range-extending vehicle.
The fuel heater 400 may be a device capable of heating a coolant, such as a water boiler.
The fuel heater control unit 401 controls the fuel heater 400 to heat the coolant in the engine 100 body when receiving the start command of the vehicle, and when the fuel heater control unit 401 determines that the coolant temperature reaches the preset temperature, the fuel heater control unit 401 transmits a heating end signal to the whole vehicle control unit 301.
Optionally, the whole vehicle control unit 301 determines the whole vehicle state to determine whether the current whole vehicle state of the vehicle meets the starting requirement, and when determining that the whole vehicle state meets the starting requirement, sends the starting requirement information to the range extender control unit 201.
The range extender control unit 201 acquires the current engine temperature of the engine through the engine control unit 101. And adjusting the target dragging torque for controlling the engine speed based on the engine temperature and the speed change preset value received in real time so as to control the engine 100 to drag through the target dragging torque, thereby ensuring the stability of the speed of the engine 100 in the starting process.
In a specific implementation, the range extender control unit 201 obtains the current engine temperature of the engine through the engine control unit 101; looking up a first parameter table based on the engine temperature to output a first motoring torque to drag the engine 100 through the generator 600; the engine control unit 101 calculates the change rate of the engine speed in real time through the current engine speed and the engine speed in the last unit time, and transmits the change rate to the range extender control unit 201, and the range extender control unit 201 realizes the control of the generator on the target dragging torque according to the change rate of the engine speed.
Alternatively, the range extender control unit 201 needs to make a valid judgment on the start request before the current engine temperature of the engine is obtained by the engine control unit 101, and after determining that the start request is valid, performs the obtaining of the current engine temperature of the engine by the engine control unit 101.
It should be noted that the processing procedure based on the above description may also be shown in the architecture shown in fig. 2.
In the embodiment of the invention, the environmental condition of the whole methanol range-extending vehicle is not considered, and after a starting signal is received, the temperature of the cooling liquid is increased in a heating mode of the fuel oil heater so as to eliminate the influence of the environmental temperature on the starting process of the methanol engine; dragging the engine by using a first dragging torque matched with the temperature of the engine; the first dragging torque is adjusted to reasonably control the rotating speed of the methanol range-extended whole vehicle in the starting process, so that the problem of influencing the rotating speed stability of the engine in the starting process is avoided.
Referring to fig. 3, a flow chart of a method for controlling a rotational speed is shown in an embodiment of the present invention, where the method includes:
step S301: when a start command is received, the fuel heater is controlled to heat the temperature of the coolant in the engine block.
In the specific implementation process of step S301, when detecting that the power supply of the whole vehicle is turned on, the electronic control unit determines that a start command is received. The fuel oil heater is controlled to preheat the cooling liquid in the engine body so as to improve the temperature of the cooling liquid.
In the process of receiving a starting instruction, namely starting the engine, the method eliminates the influence of the ambient temperature on the starting process of the methanol engine by a way of preheating the fuel heater.
Step S302: judging whether the temperature of the cooling liquid reaches a preset temperature, if so, executing step S303, and if not, returning to executing step S301.
In the specific implementation process of step S302, the temperature of the cooling liquid is compared with the preset temperature in real time, when it is determined that the temperature of the cooling liquid reaches the preset temperature, step S303 is executed, and if not, step S301 is executed again.
It should be noted that the preset temperature is set by a skilled person according to experience or experiment.
Step S303: an engine temperature of the engine is obtained.
Step S304: and adjusting the target dragging torque for controlling the engine speed based on the engine temperature and the speed change preset value.
It should be noted that, in step S304, the process of adjusting the target dragging torque for controlling the engine speed based on the preset values of the engine temperature and the speed change is specifically implemented, as shown in fig. 4, and includes the following steps:
step S401: a first motoring torque is determined that matches the engine temperature.
The method comprises the steps of respectively obtaining corresponding specific first dragging torque of an engine at different engine temperatures through experiments; writing first dragging torques corresponding to different engine temperatures into the electronic control unit to form a first parameter table, namely, storing a corresponding relation between the engine temperature and the first dragging torque in the first parameter table,
the first parameter table is stored in the form of a MAP.
In the specific implementation of step S401, a first dragging torque corresponding to the engine temperature is determined from a first parameter table, so that the generator outputs the first dragging torque to the engine, and the engine is dragged based on the first dragging torque.
Optionally, the method further comprises: and determining whether the current whole vehicle state of the automobile meets the starting requirement.
The vehicle state includes a state of starting related information such as a protection switch, a neutral switch, a clutch switch, and the like.
In a specific implementation, before the first rotational speed of the engine is obtained, it is determined whether the state of the start-related information such as the protection switch, the neutral switch, the clutch switch, etc. meets the start requirement, if so, each device of the vehicle is started, and step S402 is executed.
The start request is set according to the safety condition of the vehicle.
Step S402: a first rotational speed of the engine is obtained.
In the specific implementation process of step S402, the first rotation speed of the engine is acquired in real time, and the acquired time and the corresponding first rotation speed are stored.
Step S403: and calculating based on the current first rotating speed and the first rotating speed of the last unit time to obtain a first rotating speed change rate.
In the specific implementation process of step S403, the ratio of the current first rotation speed to the first rotation speed of the previous unit time is calculated, so as to obtain the first rotation speed change rate.
It should be noted that the unit time is set by the technician according to the situation so as to be settable to one hour.
Step S404: and adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque.
In the specific implementation process of step S404, determining a triggered torque strategy according to the relationship between the engine speed change rate and the speed change preset value; and then the first dragging torque is regulated through a torque strategy to obtain a target dragging torque so as to realize the control of the target dragging torque of the generator.
In the embodiment of the invention, the environmental condition of the whole methanol range-extending vehicle is not considered, and after a starting signal is received, the temperature of the cooling liquid is increased in a heating mode of the fuel oil heater so as to eliminate the influence of the environmental temperature on the starting process of the methanol engine; dragging the engine by using a first dragging torque matched with the temperature of the engine; the first dragging torque is adjusted to reasonably control the rotating speed of the methanol range-extended whole vehicle in the starting process, so that the problem of influencing the rotating speed stability of the engine in the starting process is avoided.
Based on the above-mentioned rotational speed control method according to the embodiment of the present invention, specifically, step S404 adjusts the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque, as shown in fig. 5, and includes the following steps:
step S501: and judging whether the first rotation speed change rate is a positive value, if so, executing the step S501, and if not, returning to executing the step S402 to acquire the first rotation speed of the engine again.
In the specific implementation process of step S501, it is determined whether the first rotation speed change rate is an acceleration with a positive value, if yes, step S501 is executed, and if not, step S402 is executed again to acquire the first rotation speed of the engine again.
Step S502: judging whether the first rotation speed change rate exceeds a rotation speed change preset value, and if so, executing the steps S503 to S505; if not, go to step S506 to step S508.
In the specific implementation process of step S502, comparing the first rotational speed change rate with a rotational speed change preset value, and executing steps S503 to S505 when the engine rotational speed change rate exceeds the rotational speed change preset value; if the engine speed change rate does not exceed the speed change preset value, steps S506 to S508 are performed.
The preset value of the rotation speed change is set by a technician according to a plurality of tests.
Step S503: triggering a hierarchical reduction strategy;
step S504: calculating a first ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
step S505: and controlling the first dragging torque to execute a grading reduction strategy according to the first proportion, so as to obtain a target dragging torque.
In the specific implementation process of the steps S503 to S505, adopting a grading reduction strategy, and calculating the ratio of the first rotating speed change rate to the rotating speed change preset value in real time to obtain a first proportion; and executing a hierarchical reduction strategy to control the first dragging torque to be reduced according to a first proportion, namely an equal proportion, so as to obtain a target dragging torque, namely, subtracting the product of the first dragging torque and the first proportion from the first dragging torque to obtain the target dragging torque.
Optionally, the engine injection is also controlled with a first ratio, i.e., equal ratio, while the target drag torque is achieved.
Step S506: triggering a hierarchical augmentation strategy;
step S507: calculating a second ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
step S508: and controlling the first dragging torque to execute a step-up strategy according to the second proportion, so as to obtain the target dragging torque.
In the specific implementation process of the steps S506 to S508, a step-by-step increasing strategy is adopted, and the ratio of the first rotating speed change rate to the rotating speed change preset value is calculated in real time to obtain a second ratio; and executing a step-up strategy to control the first dragging torque to increase according to a second proportion, namely equal proportion, so as to obtain the target dragging torque, namely, obtaining the target dragging torque by adding the product of the first dragging torque and the second proportion to the first dragging torque.
Optionally, the engine injection is also controlled with a second ratio, equal ratio enrichment, while the target drag torque is achieved.
Optionally, based on the above-described rotational speed control method, the process of executing the above-described embodiment further includes the following steps:
step S11: and judging whether the first rotating speed reaches the target idle speed or not, and whether the first rotating speed change rate is in a target range or not, executing step S12 when the first rotating speed reaches the target idle speed and the first rotating speed change rate is in the target range, and returning to continue executing step S11 when the first rotating speed is not up to the target idle speed or the first rotating speed change rate is not in the target range.
The target idle speed is set by a technician according to the rotational speed of the engine at idle speed.
The target range is set by the skilled person based on a number of experiments.
Step S12: stopping dragging the engine.
In the specific implementation process of step S12, the engine is considered to be capable of self-ignition operation at this time, dragging of the engine by the generator is stopped, and then the target dragging torque of the generator is reduced to zero.
In the embodiment of the invention, the environmental condition of the whole methanol range-extending vehicle is not considered, and after a starting signal is received, the temperature of the cooling liquid is increased in a heating mode of the fuel oil heater so as to eliminate the influence of the environmental temperature on the starting process of the methanol engine; dragging the engine by using a first dragging torque matched with the temperature of the engine; when the rotation speed change rate of the engine is positive and exceeds the rotation speed change preset value, the dragging torque of the generator adopts a step-down strategy, a first proportion of the actual rotation speed change rate and the rotation speed change preset value is calculated in real time, and the first dragging torque of the generator is controlled to be reduced in equal proportion, so that the target dragging torque is obtained; when the rotation speed change rate of the engine is positive but smaller than the rotation speed change preset value, the dragging torque of the generator adopts a step-by-step increasing strategy, the second proportion of the actual rotation speed change rate and the rotation speed change preset value is calculated in real time, and the first dragging torque of the generator is controlled to be increased in equal proportion, so that the target dragging torque is obtained. According to the invention, the first dragging torque is adjusted to reasonably control the rotating speed of the methanol range-extended whole vehicle in the starting process, so that the problem of influencing the rotating speed stability of the engine in the starting process is avoided.
Based on the rotational speed control method shown in the above embodiment of the present invention, correspondingly, the embodiment of the present invention also correspondingly discloses a rotational speed control device, as shown in fig. 6, where the device includes:
a heating module 601, configured to control a temperature of a coolant in the engine body heated by the fuel heater when a start command is received;
an acquisition module 602, configured to acquire an engine temperature of the engine when it is determined that the temperature of the coolant reaches a preset temperature;
an adjustment module 603 for adjusting a target dragging torque for controlling the engine speed based on the engine temperature and the speed variation preset value.
It should be noted that, the specific principle and execution process of each unit in the rotational speed control device disclosed in the above embodiment of the present invention are the same as those of the rotational speed control method implemented in the above embodiment of the present invention, and reference may be made to corresponding parts in the rotational speed control method disclosed in the above embodiment of the present invention, and no redundant description is given here.
In the embodiment of the invention, the environmental condition of the whole methanol range-extending vehicle is not considered, and after a starting signal is received, the temperature of the cooling liquid is increased in a heating mode of the fuel oil heater so as to eliminate the influence of the environmental temperature on the starting process of the methanol engine; dragging the engine by using a first dragging torque matched with the temperature of the engine; the first dragging torque is adjusted to reasonably control the rotating speed of the methanol range-extended whole vehicle in the starting process, so that the problem of influencing the rotating speed stability of the engine in the starting process is avoided.
Optionally, based on the rotational speed control device shown in the embodiment of the present invention, the adjusting module 603 is specifically configured to: determining a first motoring torque that matches the engine temperature to drag an engine based on the first motoring torque;
acquiring a first rotating speed of the engine;
calculating based on the current first rotating speed and the first rotating speed of the last unit time to obtain a first rotating speed change rate;
and adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque.
Optionally, according to the rotation speed control device shown in the embodiment of the present invention, the adjustment module 603 for adjusting the first dragging torque to obtain the target dragging torque based on the first rotation speed change rate and the rotation speed change preset value is specifically configured to:
triggering a step-down strategy when the first rotating speed change rate is determined to exceed a rotating speed change preset value;
calculating a first ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
and controlling the first dragging torque to execute a grading reduction strategy according to the first proportion, so as to obtain a target dragging torque.
Optionally, according to the rotation speed control device shown in the embodiment of the present invention, the adjustment module 603 for adjusting the first dragging torque to obtain the target dragging torque based on the first rotation speed change rate and the rotation speed change preset value is specifically configured to:
triggering a step-up strategy when the first rotating speed change rate is determined not to exceed a rotating speed change preset value;
calculating a second ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
and controlling the first dragging torque to execute a step-up strategy according to the second proportion, so as to obtain the target dragging torque.
Optionally, based on the rotational speed control device shown in the embodiment of the present invention, the adjustment module 603 is further configured to: and judging whether the first rotating speed change rate is a positive value or not before determining that the first rotating speed change rate exceeds a rotating speed change preset value or not.
Optionally, based on the rotational speed control method shown in the above embodiment of the present invention, referring to fig. 7 in conjunction with fig. 6, the apparatus further includes:
and the determining module 604 is configured to determine whether the current state of the whole automobile meets the starting requirement when determining that the temperature of the cooling liquid reaches the preset temperature.
The embodiment of the invention also correspondingly shows an electronic control unit, which comprises: a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to realize the rotating speed control method shown in the right of fig. 2 to 5.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A rotational speed control method, characterized in that the method comprises:
when a starting instruction is received, controlling the fuel heater to heat the temperature of cooling liquid in the engine body;
when the temperature of the cooling liquid reaches a preset temperature, acquiring the engine temperature of the engine;
determining a first motoring torque that matches the engine temperature to drag an engine based on the first motoring torque;
acquiring a first rotating speed of the engine;
calculating based on the current first rotating speed and the first rotating speed of the last unit time to obtain a first rotating speed change rate;
and adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque.
2. The method of claim 1, wherein said adjusting said first dragging torque based on said first rotational speed variation rate and a rotational speed variation preset value to obtain a target dragging torque comprises:
triggering a step-down strategy when the first rotating speed change rate is determined to exceed a rotating speed change preset value;
calculating a first ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
and controlling the first dragging torque to execute a grading reduction strategy according to the first proportion, so as to obtain a target dragging torque.
3. The method of claim 1, wherein said adjusting said first dragging torque based on said first rotational speed variation rate and a rotational speed variation preset value to obtain a target dragging torque comprises:
triggering a step-up strategy when the first rotating speed change rate is determined not to exceed a rotating speed change preset value;
calculating a second ratio based on the first rotational speed variation rate and the rotational speed variation preset value;
and controlling the first dragging torque to execute a step-up strategy according to the second proportion, so as to obtain the target dragging torque.
4. A method according to claim 2 or 3, further comprising:
and judging whether the first rotating speed change rate is a positive value or not before determining that the first rotating speed change rate exceeds a rotating speed change preset value or not.
5. The method as recited in claim 1, further comprising:
judging whether the first rotating speed reaches a target idle speed or not, and judging whether the first rotating speed change rate is in a target range or not;
and stopping dragging the engine when the first rotation speed reaches the target idle speed and the first rotation speed change rate is in the target range.
6. The method as recited in claim 1, further comprising:
when the temperature of the cooling liquid reaches the preset temperature, determining whether the current whole vehicle state of the automobile meets the starting requirement.
7. A rotational speed control apparatus, characterized in that the apparatus comprises:
the heating module is used for controlling the fuel oil heater to heat the temperature of the cooling liquid in the engine body when receiving a starting instruction;
the acquisition module is used for acquiring the engine temperature of the engine when the temperature of the cooling liquid reaches a preset temperature;
an adjustment module to determine a first motoring torque that matches the engine temperature to drag an engine based on the first motoring torque; acquiring a first rotating speed of the engine; calculating based on the current first rotating speed and the first rotating speed of the last unit time to obtain a first rotating speed change rate; and adjusting the first dragging torque based on the first rotational speed change rate and the rotational speed change preset value to obtain a target dragging torque.
8. The apparatus as recited in claim 7, further comprising:
and the determining module is used for determining whether the current whole vehicle state of the automobile meets the starting requirement or not when the temperature of the cooling liquid reaches the preset temperature.
9. An electronic control unit, characterized in that it comprises: a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program to implement the rotational speed control method of any one of claims 1 to 6.
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