CN110925109B - Method and system for controlling fan in vehicle regeneration mode - Google Patents
Method and system for controlling fan in vehicle regeneration mode Download PDFInfo
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- CN110925109B CN110925109B CN201911280979.1A CN201911280979A CN110925109B CN 110925109 B CN110925109 B CN 110925109B CN 201911280979 A CN201911280979 A CN 201911280979A CN 110925109 B CN110925109 B CN 110925109B
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- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
-
- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/13—Ambient temperature
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- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D2041/026—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus using an external load, e.g. by increasing generator load or by changing the gear ratio
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- 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
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
Abstract
The invention discloses a method and a system for controlling a fan in a complete vehicle regeneration mode, which relate to the field of engines, and judge whether an engine runs in Lof regeneration stage or Dry regeneration stage by acquiring the running state of the engine; if the operation is in Lof or Dry stage, starting Lof timing of the regeneration stage or Dry regeneration stage, judging whether the fan type is controlled, if so, acquiring the full-open condition of the fan in the regeneration mode, and judging whether the full-open condition of the fan is matched with the preset condition; if the fan is matched with the regeneration fan, the fan is controlled to be switched from the normal opening degree to the full opening degree under the regeneration mode, the exhaust temperature is increased, and the regeneration stage is guaranteed to jump normally. Therefore, the method and the system for controlling the fan in the regeneration mode of the whole vehicle effectively avoid the problems of noise and oil consumption caused by a single control mode of the fan by additionally arranging the full-open condition of the fan in the regeneration mode.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a system for controlling a fan in a vehicle regeneration mode.
Background
DPF (diesel particulate filter) is one of the key components added to the six engines in China, and when the carbon loading reaches a certain amount (4g/l), the soot (soot) in the DPF needs to be eliminated through parking regeneration. The regeneration process is divided into four stages, wherein the first two stages (Lof and Dry) mainly have the function of temperature increase and exhaust, whether the first two stages can normally jump is related to the success or failure of the regeneration process, Lof is an adsorption stage, and Dry is a temperature increase and exhaust stage.
Considering the matching difference of various main engine plants (the length of an exhaust pipe, whether the exhaust pipe surrounds heat insulation cotton or not), the problems of slow exhaust temperature rise, slow regeneration state jump or no jump and the like exist in the regeneration process of certain vehicle types, and the effect of increasing the engine load and improving the exhaust temperature by fully opening a fan in the regeneration process is proved to be obvious.
At present, whether the fan is fully opened or not in each stage in the regeneration process can only be controlled, certain blindness is achieved, real-time control according to current environment temperature, fan types and the like cannot be achieved, and therefore different fan configuration modes can be achieved for the same model matching different models, basic data are difficult to unify, and data management is not facilitated.
Disclosure of Invention
Aiming at the defects, the technical problem to be solved by the invention is as follows: the fan control method and system under the whole vehicle regeneration mode are provided, and the problems of noise and oil consumption caused by a single fan control mode are effectively avoided by additionally arranging a full-open condition of the fan under the regeneration mode.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for controlling a fan in a vehicle regeneration mode comprises the following steps:
acquiring an engine running state;
Judging whether the engine running state is Lof regeneration stage or Dry regeneration stage;
if yes, starting Lof the timing of the regeneration phase or the timing of the Dry regeneration phase, and obtaining the fan type;
judging whether the type of the fan is controlled;
if the fan is controlled, acquiring a full-open condition of the fan in the regeneration mode;
judging whether the fan full-open condition is matched with a preset condition or not;
and if the opening degree of the fan is matched with the normal opening degree, the fan is controlled to be switched to be fully opened under the regeneration mode.
Preferably, the obtaining of the full open condition of the fan in the regeneration mode includes:
acquiring Lof the duration of the regeneration stage, and acquiring the average temperature before DOC;
determining Lof whether the regeneration phase duration is greater than Lof maximum duration;
judging whether the average temperature before DOC is less than Lof jump minimum temperature;
if Lof the regeneration phase duration is greater than Lof maximum duration and the DOC front average temperature is less than Lof trip floor temperature;
and matching, and controlling the fan to be switched from the normal opening degree to the full opening under the regeneration mode.
Preferably, the obtaining of the full open condition of the fan in the regeneration mode includes:
acquiring duration of a Dry regeneration stage, and acquiring average temperature before DOC;
judging whether the duration time of the Dry regeneration stage is longer than the longest duration time of the Dry;
Judging whether the average temperature before DOC is less than the Dry jump minimum temperature or not;
if the duration of the Dry regeneration phase is longer than the longest duration of the Dry, and the DOC front average temperature is lower than the Dry jump minimum temperature;
and matching, and controlling the fan to be switched from the normal opening degree to the full opening under the regeneration mode.
Preferably, the obtaining of the full open condition of the fan in the regeneration mode includes:
acquiring an ambient temperature;
judging whether the ambient temperature is lower than the lowest ambient temperature of the fan;
if the opening degree is smaller than the normal opening degree, the fan is controlled to be switched to be fully opened in the regeneration mode.
Preferably, the preset condition is set according to differences between different models or the same model.
Preferably, the normal opening of the fan is obtained by looking up a map table, and the map table is calibrated according to the rotating speed of the engine and the design opening of the fan.
The utility model provides a fan control system under whole car regeneration mode, includes the electrical unit, and respectively with the electrical unit electricity is connected: the state detection unit is used for judging whether the engine running state is Lof regeneration stage or Dry regeneration stage, and if yes, starting Lof regeneration stage timing or Dry regeneration stage timing; a fan type detection unit for judging whether the fan is controlled; the fan full-on condition detection unit is used for judging whether the fan meets a full-on condition; and the execution unit is used for controlling the fan to be switched from the normal opening degree to the full opening state in the regeneration mode.
The fan control device is characterized by further comprising a presetting unit electrically connected with the electric control unit, wherein the presetting unit sets the fan full-open condition according to the difference between different machine types or the same machine type.
Preferably, the electronic control unit further comprises a first timer and a second timer which are respectively electrically connected with the electronic control unit, wherein the first timer is used for timing Lof stage duration, and the second timer is used for timing Dry stage duration.
The preferred mode does, still include respectively with the first temperature sensor and the second temperature sensor that the electrical control unit electricity is connected, first temperature sensor is used for gathering ambient temperature, temperature before the second temperature sensor is used for gathering the DOC.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the fan control method and system in the vehicle regeneration mode, whether the engine runs in Lof regeneration stage or Dry regeneration stage is judged by acquiring the running state of the engine; if the operation is at Lof or Dry stage, starting Lof timing of the regeneration stage or Dry regeneration stage, judging whether the fan type is controlled, if so, acquiring the full-open condition of the fan in the regeneration mode, and judging whether the full-open condition of the fan is matched with the preset condition; if the fan is matched with the regeneration fan, the fan is controlled to be switched from the normal opening degree to the full opening degree in the regeneration mode, the exhaust temperature is increased, and the regeneration stage is guaranteed to jump normally. Therefore, the method and the system for controlling the fan in the regeneration mode of the whole vehicle effectively avoid the problems of noise and oil consumption caused by a single control mode of the fan by additionally arranging the full-open condition of the fan in the regeneration mode.
The fan control device also comprises a presetting unit electrically connected with the electric control unit, and the presetting unit sets the full-open condition of the fan according to the difference between different machine types or the same machine type; the problem that the exhaust temperature cannot reach the state jump temperature in the whole vehicle regeneration process due to the consistency problem is solved.
The electronic control unit also comprises a first timer and a second timer which are respectively electrically connected with the electronic control unit, wherein the first timer is used for timing Lof stage duration, and the second timer is used for timing Dry stage duration; and the duration of each regeneration stage is increased to the full-open condition of the fan in the regeneration mode, so that the normal jump of the regeneration state is further ensured.
The DOC temperature sensor is characterized by further comprising a first temperature sensor and a second temperature sensor which are respectively electrically connected with the electric control unit, wherein the first temperature sensor is used for collecting the ambient temperature, and the second temperature sensor is used for collecting the temperature before DOC; the temperature before DOC is increased to the full-open condition of the fan in the regeneration mode, and the normal jump of the regeneration state is further ensured.
In conclusion, the method and the system for controlling the fan in the whole vehicle regeneration mode solve the problems that the temperature rise rate of the exhaust temperature in the whole vehicle cold region is slow or the exhaust temperature cannot reach the state jump temperature in the whole vehicle regeneration process due to the consistency problem; the problem that the existing regenerative fan control method only has mode judgment blindness is solved; according to the invention, the state of the fan is controlled in real time by additionally arranging judgment conditions such as the ambient temperature, the fan type, the duration of each regeneration stage and the like, so that the normal skip of the regeneration state is ensured, and the problems of noise and oil consumption caused by the current strategy are effectively avoided.
Drawings
FIG. 1 is a flow chart of a method of fan control in a vehicle regeneration mode of the present invention;
FIG. 2 is a logic diagram of a method of fan control in a vehicle regeneration mode according to the present invention;
FIG. 3 is a schematic block diagram of a fan control system in a vehicle regeneration mode of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, a method for controlling a fan in a vehicle regeneration mode includes the following steps:
step S1, obtaining the running state of the engine;
step S2, judging whether the engine running state is Lof regeneration stage or Dry regeneration stage;
step S3, if yes, starting Lof regeneration phase timing or Dry regeneration phase timing, and acquiring the fan type;
step S4, judging whether the fan type is controlled;
step S5, if the control is carried out, the full open condition of the fan under the regeneration mode is obtained;
step S6, judging whether the fan full open condition is matched with the preset condition;
And step S7, if the current opening degree is matched with the normal opening degree, the fan is controlled to be switched to be fully opened under the regeneration mode.
After the method is adopted, when the engine runs to Lof regeneration stage or Dry regeneration stage, the state of the fan is controlled in real time according to the full-open condition of the fan in the regeneration modes such as fan type and the like, the fan is reasonably utilized, the normal jump of the regeneration state is ensured, and the problems of noise and oil consumption caused by the single mode control of the fan are effectively avoided. The method is improved from the existing engine system, and is low in cost.
As shown in fig. 2, the obtaining of the full fan open condition in the regeneration mode in step S5 includes:
acquiring Lof the duration of the regeneration stage, and acquiring the average temperature before DOC;
determining Lof whether the regeneration phase duration is greater than Lof maximum duration;
judging whether the average temperature before DOC is less than Lof jump minimum temperature;
if Lof the regeneration phase duration is greater than Lof maximum duration and the DOC front average temperature is less than Lof trip floor temperature; wherein DOC is English abbreviation of diesel oxidation catalyst, and Chinese is oxidation catalyst.
And matching, and controlling the fan to be switched from the normal opening degree to the full opening under the regeneration mode.
The duration of the Lof regeneration stage and the average temperature before DOC are increased to the full-on condition of the fan, so that the full-on exhaust temperature of the fan is increased under a reasonable condition, the normal jump of the Lof regeneration stage is ensured, and the fan is reasonably controlled.
As shown in fig. 2, the step S5 of acquiring the full fan open condition in the regeneration mode includes:
acquiring duration of a Dry regeneration stage, and acquiring DOC front average temperature;
judging whether the duration of the Dry regeneration stage is longer than the longest duration of the Dry;
judging whether the average temperature before DOC is less than the Dry jump minimum temperature or not;
if the duration of the Dry regeneration phase is longer than the longest duration of the Dry, and the DOC front average temperature is lower than the Dry jump minimum temperature;
and matching, and controlling the fan to be switched from the normal opening degree to the full opening under the regeneration mode.
The duration time of the Dry regeneration stage and the average temperature before DOC are increased to the full-on condition of the fan, so that the full-on exhaust temperature of the fan is increased under a reasonable condition, the normal jump of the Dry regeneration stage is ensured, and the fan is reasonably controlled.
As shown in fig. 2, the obtaining of the full fan open condition in the regeneration mode in step S5 includes:
acquiring an ambient temperature;
judging whether the ambient temperature is lower than the lowest ambient temperature of the fan;
if the opening degree is smaller than the preset opening degree, matching is carried out, and the fan is controlled to be switched from the normal opening degree to the full opening degree in the regeneration mode.
The ambient temperature is increased to the full-open condition of the fan in the regeneration mode, and the problem that the exhaust temperature cannot reach the state jump temperature in the whole vehicle regeneration process due to the fact that the exhaust temperature rise rate in a whole vehicle cold region is low is solved.
In the embodiment, the preset conditions are set according to different models or differences among the same models; the problem that the exhaust temperature cannot reach the state jump temperature in the whole vehicle regeneration process due to the consistency problem is solved.
And checking a map table for obtaining the normal opening of the fan, and calibrating the map table according to the rotating speed of the engine and the design opening of the fan.
The method controls the state of the fan in real time by additionally arranging judgment conditions such as the type of the fan, the running time of each regeneration stage, the temperature before DOC of each regeneration stage and the like, thereby not only ensuring the normal jump of the state, but also effectively avoiding the problems of noise and oil consumption caused by the current strategy.
Example two:
as shown in fig. 3, a fan control system in a vehicle regeneration mode includes an electronic control unit, and the electronic control unit is electrically connected to: the state detection unit is used for judging whether the engine running state is Lof regeneration stage or Dry regeneration stage, and if yes, starting Lof regeneration stage timing or Dry regeneration stage timing; the fan type detection unit is used for judging whether the fan is controlled or not; the fan full-on condition detection unit is used for judging whether the fan meets a full-on condition; and the execution unit is used for controlling the fan to be switched from the normal opening degree to the full opening state in the regeneration mode.
As shown in fig. 3, the system further includes: the presetting unit is electrically connected with the electric control unit and sets the full-open condition of the fan according to the difference between different machine types or the same machine type; the first timer and the second timer are respectively electrically connected with the electronic control unit, the first timer is used for timing Lof stage duration, and the second timer is used for timing Dry stage duration; the DOC temperature sensor is characterized by further comprising a first temperature sensor and a second temperature sensor which are respectively electrically connected with the electric control unit, wherein the first temperature sensor is used for collecting the ambient temperature, and the second temperature sensor is used for collecting the temperature before DOC.
The invention relates to a fan control system under a regeneration mode of a whole vehicle, which compares detection data of each unit with a preset fan full-open condition by detecting the type of a fan, Lof regeneration stage running time, Lof pre-DOC temperature of the regeneration stage, Dry regeneration stage running time, pre-DOC temperature of the Dry regeneration stage and ambient temperature through a corresponding unit, and meets the ambient temperature, Lof full-open condition of the regeneration stage or the Dry regeneration stage on the premise that the fan is controlled.
The above-described preferred embodiments of the present invention are not intended to limit the scope of the present invention, and any modifications within the spirit and principle of the present invention, equivalent to the improvement of the method and system for controlling the fan in the vehicle regeneration mode, should be included in the scope of the present invention.
Claims (8)
1. A method for controlling a fan in a vehicle regeneration mode is characterized by comprising the following steps:
acquiring an engine running state;
judging whether the engine running state is Lof regeneration stage or Dry regeneration stage;
if yes, starting Lof the timing of the regeneration stage or the timing of the Dry regeneration stage, and obtaining the type of the fan;
judging whether the type of the fan is controlled;
if the fan is controlled, acquiring a full-open condition of the fan in the regeneration mode;
judging whether the fan full-open condition is matched with a preset condition or not; the preset conditions are set according to the difference between different models or the same model;
and if the opening degree of the fan is matched with the normal opening degree, the fan is controlled to be switched to be fully opened under the regeneration mode.
2. The method for controlling the fan in the regeneration mode of the whole vehicle according to claim 1, wherein the obtaining of the full fan-on condition in the regeneration mode comprises:
acquiring Lof the duration of the regeneration stage, and acquiring the average temperature before DOC;
Determining Lof whether the regeneration phase duration is greater than Lof maximum duration;
judging whether the average temperature before DOC is less than Lof jump minimum temperature;
if Lof the regeneration phase duration is greater than Lof maximum duration and the DOC pre-DOC average temperature is less than Lof trip minimum temperature;
and matching, and controlling the fan to be switched from the normal opening degree to the full opening degree in the regeneration mode.
3. The method for controlling the fan in the regeneration mode of the whole vehicle according to claim 1, wherein the obtaining the full fan opening condition in the regeneration mode comprises:
acquiring duration of a Dry regeneration stage, and acquiring DOC front average temperature;
judging whether the duration time of the Dry regeneration stage is longer than the longest duration time of the Dry;
judging whether the average temperature before DOC is lower than the Dry jump lowest temperature or not;
if the duration of the Dry regeneration phase is longer than the longest duration of the Dry, and the DOC front average temperature is lower than the Dry jump minimum temperature;
and matching, and controlling the fan to be switched from the normal opening degree to the full opening under the regeneration mode.
4. The method for controlling the fan in the regeneration mode of the whole vehicle according to claim 1, wherein the obtaining of the full fan-on condition in the regeneration mode comprises:
acquiring an ambient temperature;
Judging whether the environmental temperature is lower than the lowest environmental temperature of the fan;
if the opening degree is smaller than the preset opening degree, matching is carried out, and the fan is controlled to be switched from the normal opening degree to the full opening degree in the regeneration mode.
5. The method for controlling the fan in the vehicle regeneration mode according to any one of claims 1 to 4, wherein the normal opening of the fan is obtained by looking up a map table, and the map table is calibrated according to the engine speed and the design opening of the fan.
6. The utility model provides a fan control system under whole car regeneration mode which characterized in that, includes the electrical control unit, and respectively with the electrical control unit electricity is connected:
the state detection unit is used for judging whether the engine running state is Lof regeneration stage or Dry regeneration stage, and if yes, starting Lof regeneration stage timing or Dry regeneration stage timing;
a fan type detection unit for judging whether the fan is controlled;
the fan full-on condition detection unit is used for judging whether the fan meets a full-on condition;
the execution unit is used for controlling the fan to be switched from a normal opening degree to a full opening state in a regeneration mode;
and the presetting unit is used for setting the full-open condition of the fan according to the difference between different types or the same type.
7. The fan control system under the complete vehicle regeneration mode according to claim 6, further comprising a first timer and a second timer electrically connected to the electronic control unit, respectively, wherein the first timer is used for timing Lof phase duration, and the second timer is used for timing Dry phase duration.
8. The fan control system under complete vehicle regeneration mode of claim 6, further comprising a first temperature sensor and a second temperature sensor respectively electrically connected with the electronic control unit, wherein the first temperature sensor is used for collecting ambient temperature, and the second temperature sensor is used for collecting temperature before DOC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280979.1A CN110925109B (en) | 2019-12-13 | 2019-12-13 | Method and system for controlling fan in vehicle regeneration mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280979.1A CN110925109B (en) | 2019-12-13 | 2019-12-13 | Method and system for controlling fan in vehicle regeneration mode |
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| CN110925109A CN110925109A (en) | 2020-03-27 |
| CN110925109B true CN110925109B (en) | 2022-06-28 |
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| CN110925109A (en) | 2020-03-27 |
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