CN112009458A - Series mode combustion efficiency control method for hybrid electric vehicle and storage medium - Google Patents
Series mode combustion efficiency control method for hybrid electric vehicle and storage medium Download PDFInfo
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- CN112009458A CN112009458A CN202010905422.9A CN202010905422A CN112009458A CN 112009458 A CN112009458 A CN 112009458A CN 202010905422 A CN202010905422 A CN 202010905422A CN 112009458 A CN112009458 A CN 112009458A
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- combustion efficiency
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- efficiency control
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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
- B60W20/15—Control strategies specially adapted for achieving a particular effect
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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
- 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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0657—Engine torque
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a series mode combustion efficiency control method and a storage medium of a hybrid electric vehicle, when the whole vehicle is in a high-temperature series control mode, the target output power is kept unchanged, and the rotating speed of an engine is increased and the output torque of the engine is reduced simultaneously, so that the combustion efficiency reaches the optimal combustion efficiency under the current working condition. The knocking phenomenon of the engine is eliminated by increasing the rotating speed of the engine and reducing the output torque of the engine, so that the combustion efficiency of the engine reaches the optimal combustion efficiency under the current working condition, the output power is ensured to be unchanged, the knocking phenomenon of the engine is eliminated, and the deterioration of fuel economy is avoided.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to a series mode combustion efficiency control method and a storage medium of a hybrid electric vehicle.
Background
With the demand of people for reducing oil consumption and protecting environment, the market share of hybrid vehicles is increasing. Because the hybrid electric vehicle is provided with the motor, the engine and the gearbox in the cabin at the same time, the cabin is very compact in arrangement, and the heat dissipation condition is inferior to that of the traditional vehicle. If the vehicle runs in a high-temperature environment for a long time, the cabin temperature can be increased, the water temperature and the air inlet temperature of the engine can be increased, the hybrid automobile engine is generally always operated in an optimal efficiency area to ensure the optimal economy in a series power generation mode, but the engine is easy to knock in the optimal efficiency area at a high temperature, so that the combustion efficiency of the engine is reduced, the fuel consumption and the emission are deteriorated, and the cabin temperature field is deteriorated to influence the safety of the whole automobile.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method and a storage medium for controlling the combustion efficiency of a series mode of a hybrid electric vehicle.
In order to achieve the purpose, the invention provides a series mode combustion efficiency control method of a hybrid electric vehicle, which is characterized by comprising the following steps of: when the whole vehicle meets the combustion efficiency control condition, the target output power is kept unchanged, and meanwhile, the rotating speed of the engine is increased and the output torque of the engine is reduced, so that the combustion efficiency reaches the optimal combustion efficiency under the current working condition.
Further, the combustion efficiency control condition includes that the engine and the motor are in a series operation state, and the temperature of the engine water is greater than the set temperature of the engine water and/or the temperature of the engine intake air is greater than the set temperature of the intake air.
And further, monitoring the combustion efficiency in real time, and if the current combustion efficiency is greater than the combustion efficiency of the last sampling period, continuously increasing the rotating speed of the engine and reducing the output torque of the engine.
Further, when increasing the engine speed, the engine speed is increased by a first step.
Further, if the current combustion efficiency is less than the combustion efficiency of the last sampling period for the first time, the target output power is kept unchanged while the engine speed is reduced and the engine output torque is increased.
Further, when the engine speed is reduced, the engine speed is reduced by the second step.
Further, the first step size is greater than the second step size.
Further, if the current combustion efficiency is less than the combustion efficiency of the previous sampling period and the difference between the current combustion efficiency and the combustion efficiency of the previous monitoring period is less than the set difference, the current combustion efficiency is the optimal combustion efficiency.
The invention also provides a storage medium which comprises an execution instruction, wherein when the execution instruction is processed by the data processing device, the data processing device executes the series mode combustion efficiency control method of the hybrid electric vehicle.
The invention has the beneficial effects that: when the combustion efficiency of the whole vehicle is not at the optimal combustion efficiency, the target output power is kept unchanged, and the detonation phenomenon of the engine is eliminated by increasing the rotating speed of the engine and reducing the output torque of the engine, so that the combustion efficiency of the engine reaches the optimal combustion efficiency under the current working condition, the output power is unchanged, the detonation phenomenon of the engine is eliminated, and the deterioration of fuel economy is avoided.
Drawings
FIG. 1 is a flow chart of a control method of the present invention.
Fig. 2 is a universal characteristic curve of the engine in the present embodiment.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in fig. 1-2, a method for controlling the series mode combustion efficiency of a hybrid electric vehicle includes determining that an engine and a motor are in a series operating state, and when the engine and the motor are in a non-series operating state, the engine is connected to a power output shaft, and the engine speed is limited by a speed ratio and cannot be freely adjusted under the condition that the target output power is not changed.
During an engine bench test and a finished automobile test, a universal characteristic curve of the engine can be measured according to a specific finished automobile design target, and the target power of the engine is determined according to the design requirement of the finished automobile. The engine is tested on a dynamometer capable of measuring torque and oil consumption, the condition that the engine does not knock or has an excess air coefficient larger than 1 is kept, the oil consumption of the engine under different rotating speeds and output torques is measured, as shown in fig. 2, the same oil consumption working points are connected to form different equal oil consumption curves, the oil consumption is positively correlated with the combustion efficiency of the engine, when the combustion efficiency of the engine is optimal, the oil consumption of the engine is minimum, the minimum equal oil consumption curve exists, the inner area of the minimum equal oil consumption curve is an optimal combustion efficiency area, and the equal target power curve section in the optimal combustion efficiency area is an actual engine operation working condition curve as the engine generally keeps unchanged target output power.
In this embodiment, as shown in fig. 2, the minimum equal fuel consumption curve of the engine is an oil consumption line such as 280g/kwh, the target output power is 30KW, and points C and D in fig. 2 are two intersection points of the oil consumption line such as 280g/kwh and the target power line such as 30KW, if the engine does not knock or the excess air coefficient is greater than or equal to 1 at this time, in order to ensure fuel economy, it is necessary to operate the entire vehicle in the optimal combustion efficiency region, that is, the CD curve segment of the target power line such as 30KW in fig. 2, and the operating condition point of the engine in this embodiment is a point a on the CD curve at which the rotation speed is 2000 r/min.
In the embodiment, the water temperature of the engine, the air inlet temperature of the engine, the rotating speed of the engine, the output power of the engine, the combustion efficiency of the engine and the excess air coefficient are monitored in real time. When the water temperature of the engine is more than 105 ℃ or the air inlet temperature of the engine is more than 50 ℃, and the current combustion efficiency is less than the combustion efficiency of the last monitoring period, the phenomenon that the engine knocks is judged; or an excess air ratio of less than 1. The combustion efficiency is lower than the optimal combustion efficiency under the current working condition due to the two conditions, the combustion efficiency of the whole vehicle needs to be controlled and adjusted, and the combustion efficiency reaches the optimal combustion efficiency under the current working condition by adjusting the rotating speed of the engine and the output torque of the engine.
In the adjusting method in the prior art, the rotating speed of the engine is kept unchanged, the output torque of the engine is increased, and by taking fig. 2 as an example, the adjusted operating condition point is located at a point B where the rotating speed of the engine is 2000r/min on an oil consumption line of 360g/kwh and the like. Thus, although the knocking phenomenon can be eliminated, the combustion efficiency and fuel economy of the engine are greatly reduced.
In the embodiment, the operation condition point is adjusted from the point A to the point D along the CD curve, namely the target power is kept unchanged, and the engine output torque is reduced while the engine speed is increased. Because the cylinder internal gas amount is too much and the gas-oil mixture speed is slow, the detonation is easy to form, the cylinder internal gas amount can be reduced by increasing the rotating speed and reducing the torque, the gas inlet speed and the gas-oil mixture speed are faster, the detonation can not occur, and therefore the combustion efficiency of the engine can be improved.
Since the target power is engine speed × engine output torque/9550, the engine speed is inversely proportional to the engine output torque when the target power is constant, and therefore, when the engine speed is increased by the first step, the amount of decrease in the engine output torque can also be determined. And monitoring the combustion efficiency in real time, and if the current combustion efficiency is greater than the combustion efficiency of the last monitoring period, which indicates that the current combustion efficiency does not reach the optimal combustion efficiency, continuing to increase the rotation speed of the engine by the first step length, and simultaneously reducing the output torque of the engine. And then, if the current combustion efficiency is smaller than the combustion efficiency of the last monitoring period for the first time, which indicates that the combustion efficiency is overshot, and a small readjustment is needed, reducing the rotating speed of the engine by a second step length, and simultaneously increasing the output torque of the engine, wherein the second step length is smaller than the first step length. Thus, the first step length is increased to enable the combustion efficiency to be adjusted to the optimal combustion efficiency point quickly, and the second step length is decreased to enable the current combustion efficiency to reach the optimal combustion efficiency more accurately in the process of adjusting back.
And finally, if the current combustion efficiency is smaller than the combustion efficiency of the previous monitoring period and the difference between the current combustion efficiency and the combustion efficiency of the previous monitoring period is smaller than a set difference value, the current combustion efficiency is basically close to the optimal combustion efficiency, the current combustion efficiency can be determined as the optimal combustion efficiency, and the engine speed and the engine output torque at the moment are the optimal working condition points.
Claims (9)
1. A series mode combustion efficiency control method of a hybrid electric vehicle is characterized by comprising the following steps: when the whole vehicle meets the combustion efficiency control condition, the target output power is kept unchanged, and meanwhile, the rotating speed of the engine is increased and the output torque of the engine is reduced, so that the combustion efficiency reaches the optimal combustion efficiency under the current working condition.
2. The hybrid vehicle series mode combustion efficiency control method according to claim 1, characterized in that: the combustion efficiency control condition comprises that the engine and the motor are in a series running state, and the water temperature of the engine is higher than the set water temperature of the engine and/or the air inlet temperature of the engine is higher than the set air inlet temperature.
3. The hybrid vehicle series mode combustion efficiency control method according to claim 1, characterized in that: and monitoring the combustion efficiency in real time, and if the current combustion efficiency is greater than the combustion efficiency of the last sampling period, continuing to increase the rotating speed of the engine and reducing the output torque of the engine.
4. The hybrid vehicle series mode combustion efficiency control method according to claim 3, characterized in that: when increasing the engine speed, the engine speed is increased by a first step size.
5. The hybrid vehicle series mode combustion efficiency control method according to claim 4, characterized in that: and if the current combustion efficiency is smaller than the combustion efficiency of the last sampling period for the first time, keeping the target output power unchanged, and simultaneously reducing the rotating speed of the engine and increasing the output torque of the engine.
6. The series mode combustion efficiency control method of the hybrid vehicle according to claim 5, characterized in that: when the engine speed is reduced, the engine speed is reduced by the second step size.
7. The hybrid vehicle series mode combustion efficiency control method according to claim 6, characterized in that: the first step size is greater than the second step size.
8. The series mode combustion efficiency control method of the hybrid vehicle according to claim 5, characterized in that: and if the current combustion efficiency is smaller than the combustion efficiency of the previous monitoring period and the difference between the current combustion efficiency and the combustion efficiency of the previous monitoring period is smaller than the set difference value, the current combustion efficiency is the optimal combustion efficiency.
9. A storage medium, characterized by: the method comprises an execution instruction, wherein when the execution instruction is processed by a data processing device, the data processing device executes the series mode combustion efficiency control method of the hybrid electric vehicle according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905422.9A CN112009458A (en) | 2020-09-01 | 2020-09-01 | Series mode combustion efficiency control method for hybrid electric vehicle and storage medium |
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| CN202010905422.9A CN112009458A (en) | 2020-09-01 | 2020-09-01 | Series mode combustion efficiency control method for hybrid electric vehicle and storage medium |
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| CN112009458A true CN112009458A (en) | 2020-12-01 |
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| CN202010905422.9A Pending CN112009458A (en) | 2020-09-01 | 2020-09-01 | Series mode combustion efficiency control method for hybrid electric vehicle and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113715796A (en) * | 2021-07-23 | 2021-11-30 | 东风汽车集团股份有限公司 | Vehicle control method, vehicle control device, hybrid vehicle, and storage medium for hybrid vehicle |
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| US4572031A (en) * | 1983-03-26 | 1986-02-25 | Mazda Motor Corporation | Automotive driving control system utilizing a stepless transmission |
| CN101321643A (en) * | 2004-09-21 | 2008-12-10 | 丰田自动车株式会社 | Hybrid vehicle |
| CN102137783A (en) * | 2008-08-29 | 2011-07-27 | 丰田自动车株式会社 | Control device for power transmission device for vehicle |
| US20140041638A1 (en) * | 2009-01-07 | 2014-02-13 | Toyota Jidosha Kabushiki Kaisha | Drive control system |
| US20170321615A1 (en) * | 2016-05-04 | 2017-11-09 | Ford Global Technologies, Llc | Method and system for engine control |
| US20200072134A1 (en) * | 2018-09-04 | 2020-03-05 | Toyota Jidosha Kabushiki Kaisha | Miller cycle engine |
-
2020
- 2020-09-01 CN CN202010905422.9A patent/CN112009458A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572031A (en) * | 1983-03-26 | 1986-02-25 | Mazda Motor Corporation | Automotive driving control system utilizing a stepless transmission |
| CN101321643A (en) * | 2004-09-21 | 2008-12-10 | 丰田自动车株式会社 | Hybrid vehicle |
| CN102137783A (en) * | 2008-08-29 | 2011-07-27 | 丰田自动车株式会社 | Control device for power transmission device for vehicle |
| US20140041638A1 (en) * | 2009-01-07 | 2014-02-13 | Toyota Jidosha Kabushiki Kaisha | Drive control system |
| US20170321615A1 (en) * | 2016-05-04 | 2017-11-09 | Ford Global Technologies, Llc | Method and system for engine control |
| US20200072134A1 (en) * | 2018-09-04 | 2020-03-05 | Toyota Jidosha Kabushiki Kaisha | Miller cycle engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113715796A (en) * | 2021-07-23 | 2021-11-30 | 东风汽车集团股份有限公司 | Vehicle control method, vehicle control device, hybrid vehicle, and storage medium for hybrid vehicle |
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Application publication date: 20201201 |