CN111055834B - Series hybrid power system and engine starting control method thereof - Google Patents
Series hybrid power system and engine starting control method thereof Download PDFInfo
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- CN111055834B CN111055834B CN201911137444.9A CN201911137444A CN111055834B CN 111055834 B CN111055834 B CN 111055834B CN 201911137444 A CN201911137444 A CN 201911137444A CN 111055834 B CN111055834 B CN 111055834B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003921 oil Substances 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000005461 lubrication Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000295 fuel oil Substances 0.000 claims description 5
- 239000010705 motor oil Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 239000007858 starting material Substances 0.000 abstract description 2
- 230000002457 bidirectional effect Effects 0.000 description 6
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
-
- 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
- F02N11/00—Starting of engines by means of electric motors
- F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
-
- 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
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention provides an engine starting control method of a series hybrid power system, which comprises the following steps: the generator controller sends a starting instruction to the generator according to the starting instruction of the unit coordination controller; the generator controller controls the generator to drag the engine to reach a preset rotating speed at a preset dragging speed; the method comprises the following steps that a generator controller obtains working parameters when an engine reaches a preset rotating speed; the generator controller determines that the engine is started successfully according to the working parameters reaching the preset working parameters, and the generator controller controls the generator to be separated from the engine. The engine starting control method of the series hybrid power system cancels the step of starting the engine through the starter, can reduce the cost of the series hybrid power system, and simultaneously can reduce the risk that the engine is flamed out by the generator when the engine is started.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a series hybrid power system and an engine starting control method thereof.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The series hybrid power system is composed of an engine, a generator and a motor which are connected in series, wherein the engine directly drives the generator to generate electricity, the electric energy is transmitted to a battery or the motor through a controller, the motor drives an automobile through a speed change mechanism, and the battery regulates the relation between the output power of the engine and the required power of the motor.
The engine in the prior art is easily affected by the reverse torque of the generator when being started to cause flameout.
Disclosure of Invention
The invention provides an engine starting control method of a series hybrid system, which aims to at least solve the technical problem that an engine is easily affected by reverse torque of a generator to cause flameout when being started, and is realized by the following technical scheme:
the invention provides an engine starting control method of a series hybrid power system, which comprises the following steps: the generator controller sends a starting instruction to the generator according to the starting instruction of the unit coordination controller; the generator controller controls the generator to drag the engine to reach a preset rotating speed at a preset dragging speed; the method comprises the following steps that a generator controller obtains working parameters when an engine reaches a preset rotating speed; the generator controller determines that the engine is started successfully according to the working parameters reaching the preset working parameters, and the generator controller controls the generator to be separated from the engine.
The engine starting control method of the series hybrid power system cancels a starter, can reduce the cost of the series hybrid power system, and can reduce the risk that the engine is flamed out by a generator when the engine is started.
Further, the generator controller also comprises after obtaining the working parameter when the engine reaches the preset rotating speed: and the generator controller determines that the engine is not started successfully according to the condition that the working parameters do not reach the preset working parameters, and controls the generator to increase the dragging speed until the working parameters reach the preset working parameters.
Further, the preset dragging speed is 500rpm, and the step of controlling the generator to increase the dragging speed until the working parameters reach the preset working parameters by the generator controller comprises the following steps: the generator controller controls the generator to increase 20rpm every 0.1s on a 500rpm basis and controls the motoring speed of the generator to be no greater than 580 rpm.
Further, the working parameters are a starting torque value of the engine and a current slope value of the generator, and the generator controller determines that the engine is started successfully according to the starting torque value and the current slope value reaching stable preset values.
Further, the generator controller controls the generator to drag the engine at a preset dragging speed to reach a preset rotating speed, and the method comprises the following steps: the unit coordination controller sends air inlet heating, oil pumping and air exhausting and preheating wax-dissolving requests to the engine controller; the engine controller controls the fuel oil water heater to exhaust and preheat fuel oil in the preheating time.
Further, the generator controller controls the generator to drag the engine at a preset dragging speed to reach a preset rotating speed, and the method comprises the following steps: the generator controller controls the generator to drag the engine at a speed less than a preset dragging speed within the pre-lubrication time, and pre-lubrication is realized by establishing oil pressure in the engine.
Further, the engine start control method of the series hybrid system includes: acquiring pre-lubrication time and pre-heating time required by an engine according to the environment temperature, the engine water temperature and the engine oil temperature; and controlling the engine to rotate and heating the inlet air of the engine according to the pre-lubrication time and the pre-heating time.
Further, the control of the rotation of the engine and the heating of the intake air to the engine according to the pre-lubrication time and the pre-heating time comprises: the method comprises the steps that an engine controller obtains oil pressure of an engine; and sending out a lubrication abnormity alarm according to the condition that the oil pressure is less than the lower limit of the starting oil pressure of the engine.
The second aspect of the present invention also provides a series hybrid system for executing the engine start control method of the series hybrid system of the first aspect of the present invention, the series hybrid system comprising: the generator controller is electrically connected with a generator in the series hybrid power system and used for sending instructions to the generator and receiving working parameters of the generator; the engine controller is electrically connected with an engine in the series hybrid power system and used for receiving working parameters of the engine; the control module is used for controlling the rotating speed signal to carry out filtering processing; and the unit coordination controller is respectively electrically connected with the engine controller and the generator controller and is used for assisting the engine controller and the generator controller.
Further, an engine and a generator in the series hybrid system are connected through a bidirectional clutch, and the series hybrid system controls the engine to be combined with or separated from the generator through the bidirectional clutch and controls the engine to drag the generator or the generator to drag the engine.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart of an engine start control method for a series hybrid powertrain according to one embodiment of the present invention;
fig. 2 is a flow chart illustrating an engine start control method of a series hybrid system according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof.
Although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," "third," and "fourth," as well as other numerical terms, when used herein do not imply a sequence or order unless clearly indicated by the context. In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be construed broadly, e.g., as a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
For convenience of description, spatially relative terms, such as "end," "upper," "lower," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The series hybrid power system provided by the second aspect of the invention comprises an engine or a diesel engine, a generator, a control system, a DCDC converter, a water pump, a radiator, a battery and the like. Wherein, the control system includes four parts: the Engine Controller (ECU) is electrically connected with an engine in the series hybrid power system and used for receiving working parameters of the engine; the generator controller (MCU) is electrically connected with the generator in the series hybrid power system and is used for sending instructions to the generator and receiving working parameters of the generator; a DCDC module controller; and the unit coordination controller (RPU) is electrically connected with the engine controller and the generator controller respectively and is used for assisting the engine controller and the generator controller, and all parts in the system are in communication connection through a CAN bus.
Further, an engine and a generator in the series hybrid system are connected through a bidirectional clutch, and the series hybrid system controls the engine and the generator to be combined or separated through the bidirectional clutch and controls the engine to drag the generator or the generator to drag the engine. The engine is connected with the generator through the bidirectional clutch before the engine is started, so that the output power of the generator can be transmitted to the engine, the bidirectional clutch cuts off the connection between the engine and the generator when the engine is started, the engine is prevented from being pressed to be extinguished by the generator, and the connection between the engine and the generator is recovered after the engine is started, so that the power output between the engine and the generator is recovered after the engine is started.
Based on the series hybrid system of the second aspect of the invention, the first aspect of the invention provides a series hybrid engine starting control method.
Specifically, as shown in fig. 1, when the engine is started at a normal temperature, the series hybrid engine start control method includes the steps of:
s10, the generator controller sends a starting instruction to the generator according to the starting instruction of the unit coordination controller;
s20, controlling the generator to drag the engine to reach the preset rotating speed at the preset dragging speed by the generator controller;
s30, the generator controller obtains the working parameters when the engine reaches the preset rotating speed;
and S40, the generator controller determines that the engine is started successfully according to the working parameters reaching the preset working parameters, and the generator controller controls the generator to be separated from the engine.
Specifically, when an engine controller receives a starting instruction of a unit coordination controller, the engine controller sends the starting instruction of the unit coordination controller to a generator controller (MCU), the generator controller (MCU) sends a starting request instruction to a generator, the MCU controls the generator to drag the engine or a diesel engine to start at a preset dragging speed (such as within a range of 0-500 rpm) within a preset time (such as 1s), when the rotating speed of the engine reaches 600rpm, the ECU sends a starting torque value CAN message and a current slope value of the generator, when the starting torque value and the current slope value reach preset stable values, the engine is judged to be started successfully, and the generator controller (MCU) controls the generator to exit from reverse dragging.
If the engine is not started successfully, the generator increases the dragging speed by increasing 20rpm every 0.1s on the basis of 500rpm until the working parameters (the starting torque value of the engine and the current value of the generator) reach stable preset working parameters, wherein the highest dragging speed of the generator does not exceed 580 rpm.
As shown in fig. 2, the series hybrid engine start control method includes the steps of, when the engine is started at a low temperature of-35 ℃ or less:
an auxiliary unit (APU) sends air inlet heating, oil pumping, exhaust and preheating and de-waxing requests to an ECU through a CAN message, and the ECU controls an oil fuel water heater to exhaust and preheat fuel oil;
acquiring pre-lubrication time and pre-heating time required by an engine according to an ambient temperature tat, an engine water temperature Tcoolant and an engine oil temperature Toil, specifically, taking the minimum value from the temperature values as a pre-heating set temperature Theater, wherein the Theater is min (tat; Tcoolant; Toil), inquiring a pre-heating set temperature Theater and pre-heating time comparison table, and acquiring the pre-heating time theta;
controlling the rotation of the engine and heating the air inlet of the engine according to the pre-lubrication time and the pre-heating time, specifically, taking the maximum value from the temperature values as a pre-lubrication set temperature Tlube, wherein Tlube is max (Tatm; Tcoolant; Toil), inquiring a pre-lubrication set temperature Tlube and a pre-lubrication time comparison table, and obtaining a pre-lubrication time stub;
calculating a difference value tdiff between the pre-lubrication time tlebe and the pre-heating time theta, when tdiff is larger than zero, T50 is triggered, the generator drags the engine at a speed smaller than a preset dragging speed, the engine runs at a rotating speed nlow (if the MCU controls the generator to drag the engine or the diesel engine at a constant speed of 200rpm within 1s-2s to establish oil pressure and achieve the pre-lubrication purpose), the oil injector does not inject oil, after the oil pressure Poil and the tdiff time are recorded, the pre-heating work is carried out, and after Tlube, the pre-lubrication and the pre-heating are finished at the same time.
When tdiff is less than zero, T50 is triggered to preheat, the generator drags the engine at a speed less than a preset dragging speed, | tdiff |, the engine runs at a rotating speed nlow (for example, the MCU controls the generator to drag the engine or the diesel engine at a constant speed of 200rpm within 1s-2s to establish oil pressure and achieve the aim of pre-lubrication), the oil injector does not inject oil, and after oil pressure Poil and Theater are recorded, the two are finished at the same time.
The engine controller acquires the oil pressure of the engine, sends out a lubrication abnormal alarm according to the condition that the oil pressure is less than the lower limit of the starting oil pressure of the engine, and executes the following steps according to the condition that the oil pressure is more than or equal to the lower limit of the starting oil pressure of the engine:
the MCU controls the generator to drag the engine to start within 1s from 200rpm to 500rpm, the generator drives the engine to run at a preset rotating speed nstrt, the oil sprayer sprays oil, then steps similar to normal-temperature starting of the engine are executed, and the starting time tstrt of the engine is recorded;
and judging whether tstrt is less than or equal to an upper time limit tmax, and sending an engine abnormity alarm when tstrt is greater than the upper time limit tmax.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. An engine start control method of a series hybrid system, characterized by comprising the steps of:
the generator controller sends a starting instruction to the generator according to the starting instruction of the unit coordination controller;
the generator controller controls the generator to drag the engine to reach a preset rotating speed at a preset dragging speed;
the generator controller obtains working parameters when the engine reaches the preset rotating speed;
the generator controller determines that the engine is started successfully according to the working parameters reaching preset working parameters, and controls the generator to be separated from the engine;
and the generator controller determines that the engine is not started successfully according to the condition that the working parameters do not reach the preset working parameters, and controls the generator to increase the dragging speed until the working parameters reach the preset working parameters.
2. The engine start control method of a series hybrid system according to claim 1, wherein the preset motoring speed is 500rpm, and the generator controller controlling the generator to increase the motoring speed until the operating parameter reaches the preset operating parameter comprises:
the generator controller controls the generator to increase 20rpm every 0.1s on a 500rpm basis and controls the motoring speed of the generator to be no greater than 580 rpm.
3. The engine start control method of a series hybrid system as claimed in claim 1, wherein the operating parameters are a starting torque value of the engine and a current slope value of the generator, and the generator controller determines that the engine start is successful based on the starting torque value and the current slope value reaching stable preset values.
4. The engine start control method of a series hybrid system according to claim 1, wherein the generator controller controlling the generator to drag the engine at a preset drag speed until a preset rotation speed is reached comprises:
the unit coordination controller sends air inlet heating, oil pumping and air exhausting and preheating wax-dissolving requests to the engine controller;
the engine controller controls the fuel oil water heater to exhaust and preheat fuel oil in the preheating time.
5. The engine start control method of a series hybrid system according to claim 4, wherein the generator controller controlling the generator to drag the engine at a preset drag speed until a preset rotation speed is reached comprises:
the generator controller controls the generator to drag the engine at a speed less than the preset dragging speed within the pre-lubrication time, and pre-lubrication is achieved by establishing oil pressure in the engine.
6. The engine start control method of a series hybrid system according to claim 5, characterized by comprising:
acquiring the pre-lubrication time and the pre-heating time required by the engine according to the ambient temperature, the temperature of engine water and the temperature of engine oil;
and controlling the engine to rotate and heating the air inlet of the engine according to the pre-lubrication time and the pre-heating time.
7. The engine start control method of a series hybrid system according to claim 6, wherein the controlling the engine to rotate and the heating of the intake air of the engine according to the pre-lubrication time and the pre-heating time comprises:
the engine controller acquires the oil pressure of the engine;
and sending out a lubrication abnormity alarm according to the condition that the engine oil pressure is less than the lower limit of the starting oil pressure of the engine.
8. A series hybrid system for carrying out an engine start control method of the series hybrid system according to any one of claims 1 to 7, comprising:
the generator controller is electrically connected with a generator in the series hybrid power system and used for sending instructions to the generator and receiving working parameters of the generator;
an engine controller electrically connected to an engine in the series hybrid powertrain system for receiving operating parameters of the engine;
and the unit coordination controller is electrically connected with the engine controller and the generator controller respectively and is used for assisting the engine controller and the generator controller.
9. The series hybrid system according to claim 8, wherein the engine and the generator in the series hybrid system are connected by a two-way clutch, and the series hybrid system controls the engine to be coupled to or decoupled from the generator and controls the engine to drag the generator or the generator to drag the engine through the two-way clutch.
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| CN112193233B (en) * | 2020-10-21 | 2022-10-14 | 王文君 | Engine control method based on extended range hybrid electric vehicle |
| CN113415267B (en) * | 2021-07-14 | 2022-05-13 | 中国第一汽车股份有限公司 | Engine starting control method for hybrid electric vehicle, vehicle and storage medium |
| CN114294117B (en) * | 2021-12-30 | 2023-03-21 | 江苏英拓动力科技有限公司 | Control method of electro-hydraulic integrated power all-in-one machine |
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| US20100326754A1 (en) * | 2009-06-25 | 2010-12-30 | Radermacher J Axel | Method of hybrid vehicle engine start using stored kinetic energy |
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