CN114407874A - Catalyst light-off control method and control system of plug-in hybrid electric vehicle - Google Patents
Catalyst light-off control method and control system of plug-in hybrid electric vehicle Download PDFInfo
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- 230000003197 catalytic effect Effects 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 3
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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
- B60W20/16—Control strategies specially adapted for achieving a particular effect for reducing engine exhaust emissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of 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
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1626—Catalyst activation temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
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Abstract
The invention relates to the technical field of automobile control, in particular to a method and a system for controlling the ignition of a catalyst of an electric hybrid automobile. The light-off control method comprises the following steps: obtaining vehicle operation parameters, wherein the vehicle operation parameters comprise an engine operation state, a vehicle power-on state, a vehicle speed and power battery electric quantity; judging whether the following conditions are met or not according to the vehicle operation parameters; if yes, starting a catalyst to run for the first ignition control strategy; otherwise, starting is not needed; the conditions are as follows: the engine is not started, the vehicle is in a power-on state, the vehicle speed is not zero, and the electric quantity of the power battery is lower than a set electric quantity threshold value; the catalyst-run first light-off control strategy includes: and maintaining the power battery as the only power source of the vehicle, and starting the engine to heat the catalyst. The invention can make the catalyst work at the best working temperature more quickly and better to the greatest extent, efficiently convert exhaust gas and obtain better emission performance, so that the emission control of a hybrid vehicle type is more accurate.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to a method and a system for controlling the ignition of a catalyst of an electric hybrid automobile.
Background
With the development of automobile technology, new energy automobiles gradually enter the field of view of the public. The plug-in hybrid electric vehicle is a vehicle provided with two power sources of an engine and a motor and is provided with external plug-in charging. The two power output systems with different characteristics are matched with each other, so that the power performance and the oil consumption performance can be effectively balanced, and the mileage anxiety of a customer can be solved. However, due to the existence of the traditional fuel power system, referring to the experience of the traditional vehicle type, the plug-in hybrid vehicle type also needs to activate the emission post-treatment strategy, and can meet the strict emission regulation. Meanwhile, the plug-in hybrid electric vehicle model is provided with another pure electric traction power system, which is different from the traditional catalyst post-treatment strategy, and the special catalyst related strategy needs to be designed for the plug-in hybrid electric vehicle model to ensure the post-treatment efficiency of the mixed gas, so that the emission level meeting the regulation requirements is obtained.
At present, in published data, a Chinese invention patent named as a catalyst heating control method for optimizing the emission of a plug-in hybrid electric vehicle with a patent number of CN201310243437.3 introduces a catalyst heating control method for the plug-in hybrid electric vehicle, the method firstly obtains vehicle operation parameters, and the vehicle operation parameters comprise ambient temperature, engine cooling water temperature and shutdown time; and judging whether the catalyst needs to be heated according to vehicle operating parameters, and if the catalyst needs to be heated, sending a command through the control device to control the engine to work at a preset rotating speed point and output a preset torque so that the catalyst is rapidly heated. By adopting the method, when the catalyst needs to be heated can be effectively identified, and the heating logic of the catalyst is started after the engine is timely and accurately controlled to run to the set working condition point, so that the catalyst can be rapidly heated, the final exhaust emission of the plug-in hybrid electric vehicle can be remarkably reduced, and the environment protection, energy conservation and emission reduction can be realized. However, this method still has some problems, and the conditions for setting the catalyst heating are that the engine is started, the electric quantity of the vehicle-mounted power battery is lower than the preset threshold value, the engine cooling water temperature, the engine oil temperature and the ambient temperature are all within the respective preset ranges, and the current power request of the driver is lower than the preset value. That is, it is necessary to be able to perform the control operation of heating the catalyst in the case where the engine has been started. However, in the running process of the hybrid vehicle, various working conditions are involved, if the hybrid vehicle is pure electric, when the electric quantity of a power battery is insufficient and an engine needs to be involved in driving, the engine needs to be started immediately to run at the moment, and meanwhile, the catalyst also needs to run synchronously.
Disclosure of Invention
The present invention is to solve the above-mentioned drawbacks of the background art, and provide a method and a system for controlling the light-off of a catalyst of an electric hybrid vehicle.
The technical scheme of the invention is as follows: a catalyst light-off control method of an electric plug-in hybrid vehicle comprises the following steps:
obtaining vehicle operation parameters, wherein the vehicle operation parameters comprise an engine operation state, a vehicle power-on state, a vehicle speed and power battery electric quantity;
judging whether the following conditions are met or not according to the vehicle operation parameters; if yes, starting a catalyst to run for the first ignition control strategy; otherwise, starting is not needed;
the conditions are as follows: the engine is not started, the vehicle is in a power-on state, the vehicle speed is not zero, and the electric quantity of the power battery is lower than a set electric quantity threshold value;
the catalyst-run first light-off control strategy includes: and maintaining the power battery as the only power source of the vehicle, and starting the engine to heat the catalyst.
Further the catalyst-on-drive light-off control strategy further comprises: and calculating the ignition heating time according to the electric quantity of the power battery and the exhaust energy of the engine, heating the catalyst according to the calculated ignition heating time, switching the engine to be a power source of the vehicle after the ignition heating time is finished, and stopping the output of the power battery.
Further the engine is idling for the light-off warm-up time.
The set electric quantity threshold value is the sum of the limit electric quantity of the power battery which can not drive the vehicle and the electric quantity consumed by the power battery in the light-off heating time.
The further set electric quantity threshold value is 20% -25%.
A control system including a catalyst light-off control method for a plug-in hybrid vehicle includes,
the vehicle operation parameter acquisition module is used for acquiring the operation state of an engine, the power-on state of a vehicle, the speed of the vehicle and the electric quantity of a power battery;
the vehicle operation parameter judgment module is used for judging whether the vehicle meets the starting conditions of a catalyst running light-off control strategy, wherein the engine is not started, the vehicle is in a power-on state, the vehicle speed is not zero, and the electric quantity of a power battery is lower than a set electric quantity threshold value;
and the catalyst running light-off control module is used for controlling the power battery to serve as the only power source of the vehicle and starting the engine to heat the catalyst when the vehicle running parameter judgment module judges that the vehicle meets the starting condition of the catalyst running light-off control strategy.
The method further comprises the following steps of,
and the ignition heating time calculation module is used for calculating the ignition heating time according to the electric quantity of the power battery and the exhaust energy of the engine.
The catalyst running light-off control module controls the engine to run at an idle speed in the light-off heating time.
Further the vehicle operating parameter determining module includes,
and the set electric quantity threshold value acquisition module is used for calculating and acquiring a set electric quantity threshold value according to the sum of the limit electric quantity of the vehicle which cannot be driven by the power battery and the electric quantity consumed by the power battery in the ignition heating time.
The catalyst running and ignition control module further starts the engine and controls the engine to be disconnected with the output shaft when the vehicle running parameter judgment module judges that the vehicle meets the starting condition of the catalyst running and ignition control strategy, so that the power battery is used as the only power source of the vehicle, and after the catalyst is ignited and heated, the engine and the output shaft are connected, and the power output of the power battery is stopped, so that the engine is used as the only power source of the vehicle.
The invention has the advantages that: 1. according to the catalyst light-off control method, when the vehicle runs in a pure electric mode and the electric quantity of the power battery is insufficient and the engine needs to intervene, the engine is started in advance, so that the engine can start to heat the catalyst when the power battery can drive the vehicle, the catalyst quickly enters the optimal catalysis temperature, then the maximum catalysis efficiency is achieved in the process that the engine drives the vehicle, and the pollutant emission amount of the engine at the initial running stage after the pure electric drive of the engine is switched to the drive of the engine is greatly reduced;
2. according to the invention, the ignition heating time is calculated through the electric quantity of the power battery and the exhaust energy of the engine, and the engine is started to perform ignition heating on the catalyst according to the ignition heating time, namely, the electric quantity and the exhaust energy of the power battery are preset in advance to perform heating, so that the power source of a vehicle can be switched to the engine from the power battery just when the catalyst reaches the optimal catalytic temperature, and a large amount of energy can be saved while the lowest pollutant emission is ensured;
3. the engine is always in an idle running state within the ignition heating time, the pollutant discharge amount of the engine is small in the idle running state, and the catalyst can be rapidly heated by concentrated discharge energy at the moment, so that the catalyst can rapidly reach the optimal catalytic temperature, and the optimal catalytic effect is provided after the engine is completely driven by a vehicle;
4. the set electric quantity threshold value is obtained according to the sum of the limit electric quantity of the power battery which cannot drive the vehicle and the electric quantity consumed by the power battery in the ignition heating time, namely enough electric quantity is reserved for the time and the energy of the engine for heating the catalyst, so that the engine can intensively heat the catalyst before pure electricity is switched to the engine to drive the vehicle, and the time of the catalyst reaching the optimal temperature is greatly shortened;
5. the ignition control method is extremely simple, provides good treatment measures for ignition heating of the catalyst in the process of switching the power battery-driven vehicle to the engine-driven vehicle when the vehicle runs, greatly improves the efficiency of the catalyst reaching the optimal catalytic temperature, shortens the ignition heating time and reduces the pollutant emission.
On the premise of ensuring good drivability, the catalyst can work at the optimal working temperature more quickly and better to the greatest extent, the exhaust is converted efficiently, and better emission performance is obtained, so that the emission control of a hybrid vehicle type is more comprehensive and more accurate, the emission is further reduced, and the environment friendliness is facilitated.
Drawings
FIG. 1: the ignition control strategy diagram of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the present embodiment relates to a catalyst light-off control method and a control system for a plug-in hybrid electric vehicle, and the control system of the present embodiment includes the following modules: the vehicle operation parameter acquisition module is used for acquiring the operation state of an engine, the power-on state of a vehicle, the vehicle speed and the electric quantity of a power battery; the vehicle running parameter judging module is used for judging whether the vehicle meets the starting conditions of a catalyst running light-off control strategy that an engine is not started, the vehicle is in a power-on state, the vehicle speed is not zero and the electric quantity of a power battery is lower than a set electric quantity threshold value according to the obtained vehicle running parameters; and the catalyst running light-off control module is used for controlling the power battery to serve as the only power source of the vehicle and starting the engine to heat the catalyst when the vehicle running parameter judgment module judges that the vehicle accords with the starting condition of the catalyst running light-off control strategy.
The catalyst running light-off control module of the embodiment is started according to the light-off heating time after controlling the engine to be started, so the control system of the embodiment further comprises a light-off heating time calculating module for calculating the light-off heating time according to the electric quantity of the power battery and the exhaust energy of the engine.
The vehicle operation parameter judgment module needs to determine a set electric quantity threshold value, the set electric quantity threshold value needs to be obtained through a set electric quantity threshold value obtaining module, and the specific set electric quantity threshold value obtaining module obtains the set electric quantity threshold value through calculation according to the sum of the limit electric quantity of the power battery which cannot drive the vehicle and the electric quantity consumed by the power battery in the ignition heating time.
The catalyst running ignition control module controls the starting of an engine, particularly controls the engine to run at an idle speed when controlling the starting of the engine, and disconnects the engine from an output shaft, so that a power battery is still used as the only power source of a vehicle; after the light-off heating of the catalyst reaches the light-off heating time, the engine and the output shaft are connected to make the engine serve as a power source for driving the vehicle, and the output of the power battery is stopped.
This embodiment is directed at the catalyst light-off control of inserting electric formula hybrid vehicle, and specific catalyst light-off control of inserting electric formula hybrid vehicle involves two kinds of situations, and one kind of situation is the static first light-off of catalyst, and the catalyst traveles first light-off during the second kind of situation. The static first ignition of the catalyst means that the catalyst is ignited and heated when a vehicle is just started, at the moment, the running state of an engine, the power-on state of the vehicle and the vehicle speed are monitored, when the engine is not started, the vehicle is awakened to be in the just power-on state for the first time, and the vehicle speed is zero, whether the electric drive unit can drive the vehicle independently is detected, and on the premise that the electric drive unit cannot meet a vehicle drive command, the engine is dragged by a starter to serve as a main power source to drive the vehicle in cold start. At the moment, a static first-time light-off heating strategy of the catalyst is activated, as shown in fig. 1, an ignition angle is decreased, heat is gathered at an exhaust end as much as possible in a post-combustion mode, idling is increased, more exhaust energy is generated, the heat is transferred to the catalyst end, and the catalyst is enabled to reach the light-off temperature as fast as possible under the condition of reducing primary emission. In the whole process, the engine needs to continuously operate, the heating effect and the heating duration are monitored by combining the integral estimation model of the exhaust energy with the temperature of the catalyst model, the heating time is determined according to the heating duration, and the static first-time ignition heating strategy of the catalyst is completed when the heating duration is reached.
When the situation that the engine of the vehicle is not started, the vehicle is in a power-on state and the vehicle speed is not zero is monitored, the situation that the vehicle is in a running state at present can be judged, the engine is not started, namely the vehicle is completely driven by the power battery, and then the electric quantity of the power battery is detected. When the power battery is low in charge and the engine is required to be involved in vehicle driving, a catalyst running first-time ignition heating strategy is activated. The first ignition heating strategy for driving of the catalyst in the embodiment is to maintain a power battery as the only power source of a vehicle, start an engine to heat the catalyst, and disconnect the engine from a transmission output shaft under the control of a clutch so as to generate less burden on an electric drive system as far as possible without influencing torque estimation and driving smoothness, so that energy generated by idling of the engine is all used for heating the catalyst. Therefore, the transmission efficiency of the engine and the smoothness of torque output do not need to be considered, and a larger space is provided for adjusting the optimal idle speed and the optimal ignition angle and the optimal angle of retreat. The method comprises the steps of starting an engine to run at an idle speed, completing heating of a catalyst after the engine is started to run for a light-off heating time, wherein the light-off heating time of the embodiment is calculated according to the electric quantity of a power battery and the exhaust energy of the engine (judging the heating time is different from a traditional vehicle model, the heating time is estimated according to the exhaust energy, the countdown time of a timer is designed by considering the change of the SOC of the battery, the light-off heating time is consistent with that of the traditional vehicle model and is also calculated according to the exhaust energy of the engine, the overall heating time is limited by the reduction condition of the electric quantity of the power battery), heating the catalyst according to the calculated light-off heating time, switching the engine to be the power source of the vehicle after the completion, and stopping the output of the power battery. The light-off time of the present embodiment is related to the electric quantity of the power battery, specifically, the difference between the current electric quantity and the set electric quantity threshold, the set electric quantity difference of the present embodiment is the sum of the limit electric quantity of the power battery that cannot drive the vehicle and the electric quantity consumed by the power battery during the light-off heating time (the limit electric quantity of the power battery that cannot drive the vehicle of the present embodiment is 21.5%, and the electric quantity consumed by the power battery during the light-off heating time is 3%, so the light-off heating start time of the present embodiment is when the SOC of the vehicle drops to 24.5%), the present embodiment sets a compensation value under the limit condition that the power battery cannot drive the vehicle, and the compensation value is the consumption quantity of the power battery during the process that the engine heats the catalyst to the optimal catalytic temperature, the arrangement can save energy to the maximum extent, and the preset compensation value can ensure that the engine always runs at idle speed to heat the catalyst. The set electric quantity threshold value of the embodiment is 20% -25%, and the set electric quantity threshold value can be adjusted and set correspondingly according to the battery and the vehicle.
The specific control process is carried out according to the following steps: 1. firstly, confirming initial conditions to obtain vehicle operation parameters, wherein the vehicle operation parameters comprise an engine operation state, a vehicle power-on state, a vehicle speed and a power battery electric quantity, the confirmation of the initial conditions is divided into two conditions according to the vehicle operation parameters, one condition is that the engine is not started, the vehicle is in a first awakening state and the vehicle speed is zero, and the fact that the vehicle is just started at the moment is proved, and the ignition strategy of a catalyst is a static first ignition heating strategy of the catalyst; the other is that the engine is not started, the vehicle is awakened, and the vehicle speed is not zero, which proves that the vehicle is in a running state at the moment, and the ignition strategy of the catalyst is a first ignition heating strategy when the catalyst runs;
2. after the catalyst light-off heating strategy is determined, starting the catalyst light-off heating strategy set according to activation, if the catalyst static first light-off heating strategy is activated, starting an engine, reducing an ignition angle and increasing the idle speed of the engine, heating the catalyst by exhaust gas of the engine, estimating the heating time length through exhaust energy integration, setting a time length counter according to the estimated time length, and starting the engine until the temperature of the catalyst is heated to the optimal catalysis temperature;
if the catalyst running first-time ignition heating strategy is activated, the electric quantity of a power battery is collected, the vehicle is driven by the power battery alone at the moment, the electric quantity continuously drops, when the electric quantity drops to a set electric quantity threshold value, the engine is started, a control system disconnects the connection between the engine and an output shaft, so that the idle speed operation of the engine does not participate in the driving of the vehicle, an ignition angle is reduced, the idle speed is increased, the engine exhausts to heat the catalyst, the ignition heating time is calculated according to the electric quantity of the power battery and the engine exhaust energy, the catalyst is heated according to the calculated ignition heating time, the engine is switched to be a power source of the vehicle after the completion, the output of the power battery is stopped, and the engine always idles in the whole heating process.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A catalyst ignition control method of an electric hybrid vehicle is characterized by comprising the following steps: the light-off control method includes the steps of:
obtaining vehicle operation parameters, wherein the vehicle operation parameters comprise an engine operation state, a vehicle power-on state, a vehicle speed and power battery electric quantity;
judging whether the following conditions are met or not according to the vehicle operation parameters; if yes, starting a catalyst to run for the first ignition control strategy; otherwise, starting is not needed;
the conditions are as follows: the engine is not started, the vehicle is in a power-on state, the vehicle speed is not zero, and the electric quantity of the power battery is lower than a set electric quantity threshold value;
the catalyst-run first light-off control strategy includes: and maintaining the power battery as the only power source of the vehicle, and starting the engine to heat the catalyst.
2. The catalyst light-off control method of the plug-in hybrid electric vehicle according to claim 1, characterized in that: the catalyst-run first light-off control strategy further comprises: and calculating the ignition heating time according to the electric quantity of the power battery and the exhaust energy of the engine, heating the catalyst according to the calculated ignition heating time, switching the engine to be a power source of the vehicle after the ignition heating time is finished, and stopping the output of the power battery.
3. The catalyst light-off control method of the plug-in hybrid electric vehicle according to claim 2, characterized in that: the engine is idling for the light-off warm-up time.
4. The catalyst light-off control method of the plug-in hybrid electric vehicle according to claim 2, characterized in that: the set electric quantity threshold value is the sum of the limit electric quantity of the vehicle which cannot be driven by the power battery and the electric quantity consumed by the power battery in the ignition heating time.
5. The catalyst light-off control method of the plug-in hybrid electric vehicle as claimed in claim 4, wherein: the set electric quantity threshold value is 20% -25%.
6. A control system comprising the catalyst light-off control method for a plug-in hybrid vehicle according to any one of claims 1 to 5, characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the vehicle operation parameter acquisition module is used for acquiring the operation state of an engine, the power-on state of a vehicle, the speed of the vehicle and the electric quantity of a power battery;
the vehicle operation parameter judgment module is used for judging whether the vehicle meets the starting conditions of a catalyst running light-off control strategy, wherein the engine is not started, the vehicle is in a power-on state, the vehicle speed is not zero, and the electric quantity of a power battery is lower than a set electric quantity threshold value;
and the catalyst running light-off control module is used for controlling the power battery to serve as the only power source of the vehicle and starting the engine to heat the catalyst when the vehicle running parameter judgment module judges that the vehicle meets the starting condition of the catalyst running light-off control strategy.
7. The catalyst light-off control system of a plug-in hybrid electric vehicle as set forth in claim 6, wherein: also comprises the following steps of (1) preparing,
and the ignition heating time calculation module is used for calculating the ignition heating time according to the electric quantity of the power battery and the exhaust energy of the engine.
8. The catalyst light-off control system of a plug-in hybrid electric vehicle as set forth in claim 7, wherein: the catalyst running light-off control module controls the engine to run at an idle speed within the light-off heating time.
9. The catalyst light-off control system of a plug-in hybrid electric vehicle as set forth in claim 7, wherein: the vehicle operation parameter judgment module comprises a vehicle operation parameter judgment module,
and the set electric quantity threshold value acquisition module is used for calculating and acquiring a set electric quantity threshold value according to the sum of the limit electric quantity of the vehicle which cannot be driven by the power battery and the electric quantity consumed by the power battery in the ignition heating time.
10. The catalyst light-off control system of a plug-in hybrid electric vehicle as set forth in claim 6, wherein: the catalyst running and ignition control module starts the engine and controls the engine to be disconnected with the output shaft when the vehicle running parameter judgment module judges that the vehicle meets the starting condition of the catalyst running and ignition control strategy, so that the power battery is used as the only power source of the vehicle, and after the catalyst is ignited and heated, the engine and the output shaft are connected, and the power output of the power battery is stopped, so that the engine is used as the only power source of the vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210070194.7A CN114407874B (en) | 2022-01-21 | 2022-01-21 | Catalytic converter ignition control method and control system of plug-in hybrid electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210070194.7A CN114407874B (en) | 2022-01-21 | 2022-01-21 | Catalytic converter ignition control method and control system of plug-in hybrid electric vehicle |
Publications (2)
| Publication Number | Publication Date |
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| CN114407874A true CN114407874A (en) | 2022-04-29 |
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