CN115076006A - Range extender type methanol engine low-temperature cold start system and start method - Google Patents
Range extender type methanol engine low-temperature cold start system and start method Download PDFInfo
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- CN115076006A CN115076006A CN202210754894.8A CN202210754894A CN115076006A CN 115076006 A CN115076006 A CN 115076006A CN 202210754894 A CN202210754894 A CN 202210754894A CN 115076006 A CN115076006 A CN 115076006A
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- engine
- circulation pipeline
- ptc heater
- engine coolant
- range extender
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 239000004606 Fillers/Extenders Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002826 coolant Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims description 33
- 239000000110 cooling liquid Substances 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/023—Temperature of lubricating oil or working fluid
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention belongs to the technical field of low-temperature starting of methanol engines, and discloses a low-temperature cold starting system and a low-temperature cold starting method of a range extender type methanol engine; the starting system comprises a front-end preheating system, and the front-end preheating system comprises a methanol engine, a PTC heater, an electronic three-way valve, an electronic water pump, a mechanical water pump and a water tank; the methanol engine, the electronic three-way valve, the electronic water pump and the PTC heater are connected in a matched mode to form an internal circulation pipeline, and the internal circulation pipeline is started when the current temperature of the engine coolant is lower than a set threshold value, so that the engine coolant is heated and circulated in the internal circulation pipeline; the methanol engine, the electronic three-way valve, the water tank and the mechanical water pump are matched and connected to form an external circulation pipeline, and the external circulation pipeline is started when the current temperature of the engine coolant is not lower than a set threshold value, so that the engine coolant is cooled and circulated in the external circulation pipeline.
Description
Technical Field
The invention belongs to the technical field of low-temperature starting of methanol engines, and particularly relates to a low-temperature cold starting system and a starting method of a range extender type methanol engine.
Background
The methanol fuel has poor low-temperature flowing performance and a flash point of about 15 ℃, so that the methanol engine cannot be started when the temperature of a cooling liquid is lower than 15 ℃, and the phenomenon of cylinder flooding is easy to occur.
In order to solve the problem that a methanol engine is difficult to start or cannot start in a cold state, a traditional methanol engine on the market generally adopts a gasoline pilot starting method, a gasoline supply and gasoline injection control system needs to be installed on the methanol engine, when the temperature of a cooling liquid is lower than 15 ℃, gasoline is used as fuel to start a vehicle, and when the temperature of the cooling liquid of the engine reaches a certain temperature, the cooling liquid is switched into methanol fuel. In this case, the vehicle has a complicated engine structure due to the addition of the gasoline supply and gasoline injection control system, which greatly increases the cost and also increases the difficulty of maintenance of the engine system.
Disclosure of Invention
In view of the above, the present invention provides a low temperature cold start system and a start method for a range extender type methanol engine.
In order to achieve the purpose, the invention provides the following technical scheme:
a low temperature cold start system of a range extender type methanol engine comprises a front end preheating system, wherein the front end preheating system comprises a methanol engine, a PTC heater, an electronic three-way valve, an electronic water pump, a mechanical water pump and a water tank, and the low temperature cold start system comprises:
the methanol engine, the electronic three-way valve, the electronic water pump and the PTC heater are connected in a matched mode to form an internal circulation pipeline, and the internal circulation pipeline is started when the current temperature of the engine coolant is lower than a set threshold value, so that the engine coolant is heated and circulated in the internal circulation pipeline;
the methanol engine, the electronic three-way valve, the water tank and the mechanical water pump are connected in a matching way to form an external circulation pipeline (wherein the mechanical water pump is connected with an engine crankshaft), and the external circulation pipeline is started when the current temperature of the engine coolant is not lower than a set threshold value, so that the engine coolant is cooled and circulated in the external circulation pipeline.
Preferably, the front-end preheating system further comprises an electronic thermostat, and the electronic thermostat is connected between the methanol engine and the electronic three-way valve.
Preferably, the front end preheating system further comprises a power battery, and the power battery supplies power to the PTC heater when the internal circulation line is started.
Preferably, the starting system further comprises a back-end control system, and the back-end control system comprises:
the temperature acquisition module is used for acquiring the current temperature of the engine coolant in the front-end preheating system;
and the control starting module is used for controlling and starting the internal circulation pipeline or the external circulation pipeline in the front-end preheating system according to the current temperature of the engine coolant.
Preferably, a power regulation unit is included in the execution module, and the power regulation unit is started in response to the execution of the internal circulation, and the power regulation unit is used for regulating and controlling the current heating power of the PTC heater according to the current temperature of the engine coolant.
Preferably, the PTC heater comprises N limiting sections in a temperature range lower than a set threshold, the PTC heater is provided with N heating levels, and the N limiting sections are in one-to-one correspondence with the N heating levels; wherein the heating level is defined by a heating power of the PTC heater.
A low-temperature cold start method of a range extender type methanol engine is applied to the disclosed start system and specifically comprises the following steps:
judging whether the current temperature of the engine coolant in the front-end preheating system is lower than a set threshold value or not;
starting an internal circulation pipeline of the front-end preheating system to heat and circulate engine coolant in the internal circulation pipeline;
and if not, starting an external circulation pipeline of the front-end preheating system to enable the engine coolant to circulate in the external circulation pipeline in a cooling mode.
Preferably, when the internal circulation pipeline of the front-end preheating system is started:
acquiring a current limited interval corresponding to the current temperature of engine coolant in a front-end preheating system;
a target heating level for the PTC heater is obtained according to the currently defined interval, and the PTC heater circularly heats engine coolant in the inner circulation line based on the target heating level.
Compared with the prior art, the invention has the following beneficial effects:
the invention is based on the arrangement of structures such as an electronic three-way valve, an electronic water pump, a PTC heater and the like, a front-end preheating system comprising an inner circulation pipeline and an outer circulation pipeline is formed in an integral engine starting system, the temperature of engine coolant is monitored in real time in the front-end preheating system, when the temperature of the engine coolant is lower than a set threshold value, the inner circulation pipeline is started, and the PTC heater is correspondingly utilized to heat the coolant, so that the temperature of the engine coolant can reach the ignition temperature of methanol fuel within several minutes, and the problem that a range extender type methanol engine cannot be started under the low-temperature condition is solved.
In addition, the temperature range lower than the set threshold is divided into N limiting intervals, and the PTC heater is set to have N heating levels corresponding to the N limiting intervals one by one, so that different heating levels can be flexibly selected according to the temperature of the engine coolant, the heating levels are specifically limited through heating power, the heating energy consumption can be effectively reduced under the condition of meeting the requirement of rapid preheating, and the service life of the PTC heater is prolonged.
Drawings
FIG. 1 is a block diagram of a starting system of the present invention;
FIG. 2 is a block diagram of an internal circulation circuit in the starting system of the present invention;
FIG. 3 is a structural diagram of an external circulation pipeline in the starting system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a low temperature cold start system of a range extender type methanol engine, which specifically includes a front end preheating system and a rear end control system; wherein:
the front-end preheating system comprises a methanol engine, an electronic thermostat, a PTC heater, an electronic three-way valve, an electronic water pump, a mechanical water pump and a water tank; and is
The methanol engine, the electronic thermostat, the electronic three-way valve, the electronic water pump and the PTC heater are matched and connected to form an internal circulation pipeline, and the internal circulation pipeline is started when the current temperature of the engine coolant is lower than a set threshold value, so that the engine coolant is heated and circulated in the internal circulation pipeline;
the methanol engine, the electronic thermostat, the electronic three-way valve, the water tank and the mechanical water pump are matched and connected to form an external circulation pipeline, and the external circulation pipeline is started when the current temperature of the engine coolant is not lower than a set threshold value, so that the engine coolant is cooled and circulated in the external circulation pipeline.
In addition, the front-end preheating system also comprises a power battery, and particularly when the internal circulation pipeline is started, the power battery supplies power to the PTC heater.
The back-end control system comprises a temperature acquisition module and a control starting module
The temperature acquisition module is used for acquiring the current temperature of the engine coolant in the front-end preheating system;
the control starting module is used for controlling and starting an internal circulation pipeline or an external circulation pipeline in the front-end preheating system according to the current temperature of the engine coolant.
As for the internal circulation line, as shown in fig. 2 in conjunction with the above, the current temperature of the engine coolant is activated when it is lower than a set threshold, which is preferably set to 20 ℃. When the internal circulation pipeline is specifically started, the electronic thermostat is opened, the electronic three-way valve is switched to a state communicated with the electronic water pump, and the electronic water pump is opened, so that the cooling liquid starts to flow in the internal circulation pipeline, and the engine cooling liquid is circularly heated.
Specifically, the execution module comprises a power regulation and control unit, the power regulation and control unit is started in response to the execution of the internal circulation, and the power regulation and control unit is used for regulating and controlling the current heating power of the PTC heater according to the current temperature of the engine cooling liquid.
The temperature range below 20 ℃ is divided into the following defined intervals: A) below-15 ℃; B) 15 ℃ below zero to 0 ℃; C) 0-20 ℃;
the corresponding heating power according to the PTC heater defines several heating levels as follows: one stage) full power heating; two stage) 75% power heating; three-stage) 50% power heating;
the PTC heater is adjusted in accordance with the correspondence relationship, wherein a) corresponds to one stage), B) corresponds to two stages, and C) corresponds to three stages).
Regarding the external circulation line, as shown in fig. 3, when the engine coolant is heated to 20 ℃ or higher through the internal circulation line, the electronic three-way valve is switched to a state of being communicated with the water tank, and the PTC heater and the electronic water pump are turned off, so that the external circulation of the engine coolant is performed according to the structure shown in fig. 3, and the methanol engine can be efficiently started in this state.
The invention provides a low-temperature cold start method of a range extender type methanol engine, which is applied to the start system and specifically comprises the following steps:
judging whether the current temperature of the engine coolant in the front-end preheating system is lower than a set threshold value or not;
starting an internal circulation pipeline of a front-end preheating system to heat and circulate engine coolant in the internal circulation pipeline;
and if not, starting an external circulation pipeline of the front-end preheating system to enable the engine coolant to circulate in the external circulation pipeline in a cooling mode.
Wherein, when starting the internal circulation pipeline of the front-end preheating system:
acquiring a current limited interval corresponding to the current temperature of engine coolant in a front-end preheating system;
a target heating level for the PTC heater is obtained according to the currently defined interval, and the PTC heater circularly heats the engine coolant in the internal circulation line based on the target heating level.
In summary, the present invention supplies power to the PTC heater through the power battery, and performs heating or stops heating automatically according to whether the temperature of the cooling liquid is lower than the ignition temperature. Specifically, the method comprises the following steps:
when the vehicle control unit recognizes that the engine cooling liquid is lower than the ignition temperature, the PTC heater and the electronic water pump are controlled to be started, and the electronic three-way valve is controlled to enable the engine cooling liquid to operate in an internal circulation mode, so that the engine cooling liquid is heated, and the engine can reach the ignition temperature of the methanol fuel very quickly.
And when the vehicle control unit identifies that the temperature of the engine coolant is higher than the ignition temperature, the PTC heater and the electronic water pump are automatically closed, and the electronic three-way valve is controlled to enable the coolant to perform external circulation operation.
In addition, the automatic operation of the whole starting system is realized by combining a rear-end control system.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A low temperature cold start system of a range extender type methanol engine, characterized in that: preheating the system including the front end, just the front end preheats the system and includes methanol engine, PTC heater, electron three-way valve, electron water pump, mechanical water pump and water tank, wherein:
the methanol engine, the electronic three-way valve, the electronic water pump and the PTC heater are connected in a matched mode to form an internal circulation pipeline, and the internal circulation pipeline is started when the current temperature of the engine coolant is lower than a set threshold value, so that the engine coolant is heated and circulated in the internal circulation pipeline;
the methanol engine, the electronic three-way valve, the water tank and the mechanical water pump are matched and connected to form an external circulation pipeline, and the external circulation pipeline is started when the current temperature of the engine coolant is not lower than a set threshold value, so that the engine coolant is cooled and circulated in the external circulation pipeline.
2. A methanol engine cold start system of range extender type as claimed in claim 1, wherein: the front-end preheating system further comprises an electronic thermostat, and the electronic thermostat is connected between the methanol engine and the electronic three-way valve.
3. A methanol engine cold start system of range extender type as claimed in claim 1, wherein: the front end preheating system further comprises a power battery, and when the internal circulation pipeline is started, the power battery supplies power to the PTC heater.
4. A methanol engine cold start system of range extender type as claimed in claim 1, wherein: still include back end control system, just back end control system includes:
the temperature acquisition module is used for acquiring the current temperature of the engine coolant in the front-end preheating system;
and the control starting module is used for controlling and starting an internal circulation pipeline or an external circulation pipeline in the front-end preheating system according to the current temperature of the engine coolant.
5. The low temperature cold start system of a range extender type methanol engine according to claim 4, wherein: the execution module comprises a power regulation and control unit, the power regulation and control unit is started in response to execution of the inner circulation, and the power regulation and control unit is used for regulating and controlling current heating power of the PTC heater according to the current temperature of the engine cooling liquid.
6. A methanol engine cold start system of range extender type as claimed in claim 5, wherein: the PTC heater is provided with N limiting intervals in a temperature range lower than a set threshold, the PTC heater is provided with N heating levels, and the N limiting intervals are in one-to-one correspondence with the N heating levels;
wherein the heating level is defined by a heating power of the PTC heater.
7. A low-temperature cold start method of a range extender type methanol engine, which is applied to the starting system of claim 1 or 4, and specifically comprises the following steps:
judging whether the current temperature of the engine coolant in the front-end preheating system is lower than a set threshold value or not;
starting an internal circulation pipeline of the front-end preheating system to heat and circulate engine coolant in the internal circulation pipeline;
and if not, starting an external circulation pipeline of the front-end preheating system to enable the engine coolant to circulate in the external circulation pipeline in a cooling mode.
8. The low temperature cold start method of a range extender type methanol engine as set forth in claim 7, wherein when starting the internal circulation line of the front end preheating system:
acquiring a current limited interval corresponding to the current temperature of engine coolant in a front-end preheating system;
a target heating level for the PTC heater is obtained according to the currently defined interval, and the PTC heater circularly heats engine coolant in the inner circulation line based on the target heating level.
9. The low temperature cold start method of a range extender type methanol engine as set forth in claim 8, wherein: the heating level is defined by the heating power of the PTC heater.
10. The low temperature cold start method of a range extender type methanol engine according to claim 9, characterized in that: the PTC heater is provided with N heating levels, and the N limiting intervals correspond to the N heating levels one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210754894.8A CN115076006A (en) | 2022-06-29 | 2022-06-29 | Range extender type methanol engine low-temperature cold start system and start method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210754894.8A CN115076006A (en) | 2022-06-29 | 2022-06-29 | Range extender type methanol engine low-temperature cold start system and start method |
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| CN115076006A true CN115076006A (en) | 2022-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210754894.8A Pending CN115076006A (en) | 2022-06-29 | 2022-06-29 | Range extender type methanol engine low-temperature cold start system and start method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116292017A (en) * | 2023-05-19 | 2023-06-23 | 潍柴动力股份有限公司 | Heating method, device, equipment and system of methanol range extender engine |
| CN116331183A (en) * | 2023-05-23 | 2023-06-27 | 潍柴动力股份有限公司 | Rotating speed control method and device and electronic control unit |
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| CN114593000A (en) * | 2022-03-17 | 2022-06-07 | 合众新能源汽车有限公司 | Vehicle heat cycle system, and engine preheating method and device |
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Application publication date: 20220920 |