CN117211932A - A heating control strategy for a gas engine extended-range hybrid oxygen sensor - Google Patents
A heating control strategy for a gas engine extended-range hybrid oxygen sensor Download PDFInfo
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- CN117211932A CN117211932A CN202311110192.7A CN202311110192A CN117211932A CN 117211932 A CN117211932 A CN 117211932A CN 202311110192 A CN202311110192 A CN 202311110192A CN 117211932 A CN117211932 A CN 117211932A
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a heating control strategy of a range-extended type hybrid power oxygen sensor of a gas engine, and relates to the technology of hybrid power automobiles. Acquiring the SOC of a battery in real time, and heating the oxygen sensor in advance if the SOC of the battery is lower than a calibration threshold value; and stopping heating the oxygen sensor when the engine is stopped. The invention ensures that the oxygen sensor can work normally before the engine is started, avoids open-loop control of the air-fuel ratio after the engine is started, ensures emission control and greatly improves the use reliability of the oxygen sensor.
Description
Technical Field
The invention relates to the technology of hybrid electric vehicles, in particular to a heating control strategy of a range-extended hybrid electric oxygen sensor of a gas engine.
Background
The Guohu gas engine is provided with an oxygen sensor behind the supercharger exhaust pipe to monitor the exhaust oxygen concentration for feedback to the ECU for air-fuel ratio closed-loop control. Under normal conditions, after the engine is started, the oxygen sensor starts to heat after passing through the calibrated dew point time, starts to work after being heated to a certain temperature, stops working after the engine is stopped, and repeatedly works in the same way. The range-extending type hybrid power engine is mainly used for generating power, does not participate in driving, and when the power generation reaches the set value of the whole vehicle SOC, the engine receives a stop instruction of the whole vehicle to stop, and the engine is frequently started and stopped through the actual road spectrum analysis, so that the working state of the oxygen sensor is frequently changed.
The schematic diagram of the extended-range hybrid engine system is shown in fig. 1, the engine 3 is connected with the generator 5 through the clutch 4 to do work and generate electricity to be stored in the power battery 9, and the power battery 9 drives the motor 8 to drive wheels of the whole vehicle. The oxygen sensor is typically mounted after the supercharger turbine and before the catalyst. The oxygen sensor has two heating energy sources, namely heating through a heating chip of the oxygen sensor, and heating through tail gas of an engine. Depending on the calibration, the start-stop operation of the oxygen sensor may be synchronized with the engine or not, as shown in FIG. 2.
However, the method has the following defects that whether a nano mode is adopted, the method has the following steps:
mode one: the synchronous problem of oxygen sensor operating condition and engine exists: after the engine is started and operated, the oxygen sensor cannot immediately enter a working state, and can work normally after being heated to a normal working temperature, so that the air-fuel ratio of the engine cannot be monitored normally (namely open loop control) for a period of time, and the actual air-fuel ratio control has the condition of lean or rich, so that the problem of high emission is caused.
Mode two: the problem that the working state of the oxygen sensor is asynchronous with the engine exists is that: after the engine is stopped, the oxygen sensor continues to continuously heat, and the heating energy of the oxygen sensor mainly depends on the oxygen sensor, so that the long-time heating can influence the reliability of the oxygen sensor.
Therefore, it is desirable to design a new control strategy that ensures both emissions control and sensor reliability.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides a heating control strategy of a gas engine range-increasing type hybrid power oxygen sensor, which ensures that the oxygen sensor can work normally before an engine is started, avoids open-loop control of the air-fuel ratio after the engine is started, and ensures emission control.
The invention relates to a heating control strategy of a range-extending type hybrid power oxygen sensor of a gas engine, which is used for collecting a battery SOC in real time, and heating the oxygen sensor in advance if the battery SOC is lower than a calibration threshold value; and stopping heating the oxygen sensor when the engine is stopped.
The oxygen sensor is heated in advance, specifically including,
setting a lowest calibration threshold, a half power calibration threshold and a highest calibration threshold; on the premise that the engine is not started,
if the battery SOC is lower than the highest calibration threshold, preheating the oxygen sensor;
if the SOC of the battery is lower than a half-power calibration threshold, heating the oxygen sensor to 50% -70% of rated working temperature;
and if the battery SOC is equal to or lower than the minimum calibration threshold, heating the oxygen sensor to the rated working temperature.
After preheating the oxygen sensor, the preheating temperature of the oxygen sensor is 5-20 ℃ higher than the temperature before the oxygen sensor is not heated, and the lowest preheating temperature of the oxygen sensor is not lower than 30-40% of the rated working temperature.
Acquiring the power-down time length required by the battery SOC from the highest calibration threshold value to the half-power calibration threshold value, and taking 40% -60% of the power-down time length as the calibration time length; and acquiring a temperature rise step according to the preheating temperature, the unheated temperature and the calibrated time length, so as to gradually heat the oxygen sensor by the temperature rise step.
The step-up distance is determined by the following formula,
in the above, deltaT is the temperature rise step；T 1 Is the preheating temperature; t (T) 0 Is the temperature before heating; t is the calibration time.
Advantageous effects
The invention has the advantages that: through the calibration of the battery SOC, when the battery SOC is lower than a calibration threshold value, the oxygen sensor is heated in advance, so that the oxygen sensor can work normally before the engine is started, the open-loop control of the air-fuel ratio after the engine is started is avoided, and the emission control is ensured. When the engine is stopped, the heating of the oxygen sensor is stopped, and the reliability problem caused by long-time heating of the oxygen sensor is avoided.
Drawings
FIG. 1 is a schematic illustration of an extended range hybrid engine system;
FIG. 2 is a timing diagram of operation of an oxygen sensor with and without synchronization of engine start and stop;
FIG. 3 is a schematic diagram of the oxygen sensor of the present invention in operation with start-stop of the engine.
Wherein: 1-a booster compressor; 2-an air inlet pipe; 3-engine; a 4-clutch; a 5-generator; 6, an exhaust pipe; 7-driving wheels of the whole vehicle; 8-driving a motor; 9-a power cell; 10-a complete vehicle VCU; 11-an engine ECU; 12-a supercharger turbine; 13-oxygen sensor.
Detailed Description
The invention is further described below in connection with the examples, which are not to be construed as limiting the invention in any way, but rather as falling within the scope of the claims.
Referring to fig. 1 and 3, according to the heating control strategy of the gas engine extended-range hybrid power oxygen sensor, when the engine ECU11 receives that the battery SOC sent by the whole vehicle VCU10 is lower than a calibration threshold, the engine ECU11 sends a command to the oxygen sensor 13 to heat the oxygen sensor in advance, so that the oxygen sensor 13 can work normally before the engine 3 is started, open loop control of the air-fuel ratio after the engine 3 is started is avoided, and emission control is ensured. In the invention, an engine ECU11 and a whole vehicle VCU10 are connected through CAN communication, and a battery SOC of a power battery 9 is sent to the engine ECU11 through the whole vehicle VCU 10.
When the engine ECU11 receives the stop command of the whole vehicle VCU10, the engine ECU11 sends a command to the oxygen sensor 13 to stop heating the oxygen sensor 13 while the engine 3 performs stop, so that the reliability problem caused by long-time heating of the oxygen sensor 13 is avoided.
The heating control strategy of the extended-range hybrid power oxygen sensor is based on the original control strategy, does not increase system parts, can meet the functional requirements only by developing a new control strategy, and is easy to realize.
In this embodiment, the oxygen sensor is heated in advance, specifically including,
setting a minimum calibration threshold, a half power calibration threshold and a maximum calibration threshold. For example, the lowest calibration threshold is 20%, i.e. when the battery SOC is 20%, the engine 3 is started to charge the power battery 9. The highest calibration threshold may be set to 25% and the half power calibration threshold may be set to 22%.
The engine 3 is in an inactive state until the lowest calibration threshold is reached. And if the battery SOC is lower than the highest calibration threshold, preheating the oxygen sensor. And if the battery SOC is lower than a half-power calibration threshold, heating the oxygen sensor to 60% of the rated working temperature. And if the battery SOC is equal to or lower than the minimum calibration threshold, heating the oxygen sensor to the rated working temperature. A step of
The three-step method is adopted to heat the oxygen sensor, namely, after the oxygen sensor is preheated, the temperature of the oxygen sensor is raised to 60% of the rated working temperature, and finally, the oxygen sensor is heated to the rated working temperature, so that the synchronous working of the oxygen sensor and the engine 3 is met, and the energy saving is facilitated. In addition, the preheating function of the oxygen sensor can enable the oxygen sensor to be better suitable for the use of a low-temperature environment, and the phenomenon that the parts are damaged due to too high thermal expansion speed caused by too high temperature rise during direct full-power heating is prevented.
Here, since the engine 3 needs a certain time from starting to its stable output, and the temperature of the oxygen sensor is 60% of the rated operating temperature in the stage of the battery SOC from the half power calibration threshold value to the lowest calibration threshold value, the time required for heating to the rated operating temperature is also short, so that the time difference from starting to its stable output of the engine 3 can be used to realize heating of the oxygen sensor to the rated temperature, and the normal operation of the oxygen sensor is ensured to be synchronized with the normal operation of the engine 3.
For the specific preheating arrangement, after the oxygen sensor is preheated in this embodiment, the preheating temperature of the oxygen sensor is 5 ℃ to 20 ℃ higher than the temperature before the oxygen sensor is not heated, and the preheating temperature of the oxygen sensor is not lower than 40% of the rated working temperature.
Specifically, the temperature sensor can be selected according to the current ambient temperature. For example, at a lower air temperature, say 10 ℃, it is preferable to add 20 ℃ to the temperature before the oxygen sensor is not heated, and if the temperature is not lower than 40% of the rated operating temperature, the warm-up temperature is set to 30 ℃. Assuming that 40% of the rated operating temperature is 30 ℃ and the current air temperature is below zero, the condition that the preheating temperature of the oxygen sensor is not lower than 40% of the rated operating temperature is not satisfied even if the temperature before the oxygen sensor is not heated plus 20 ℃, in which case 30 ℃ should be taken as the preheating temperature. Assuming that the air temperature is 30 ℃, 40% of the rated operating temperature is 30 ℃, 30 ℃ +5 ℃ =35 ℃ can be taken as the preheating temperature.
Because the preheating process is carried out in a sufficient time, the invention adopts an increasing heating temperature rise mode to preheat the oxygen sensor. Specifically, the power-down time required by the battery SOC from the highest calibration threshold to the half-power calibration threshold is obtained, and the power-down time may be the power-down time of the power battery 9 of the whole vehicle under the normal working condition. And taking 50% of the power-down time as a calibration time, and acquiring a temperature rise step according to the preheating temperature, the unheated temperature and the calibration time so as to gradually heat the oxygen sensor by the temperature rise step. In particular, the step-up distance is determined by the following formula,
in the above formula, deltaT is the temperature rise step distance; t (T) 1 Is the preheating temperature; t (T) 0 Is the temperature before heating; t is the calibration time.
The mode of increasing heating temperature rise is adopted, so that the problem that the parts are damaged due to the fact that the temperature rise is too fast when the oxygen sensor is heated, and the service life of the oxygen sensor is greatly prolonged.
While only the preferred embodiments of the present invention have been described above, it should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these do not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (5)
1. The heating control strategy of the gas engine extended-range type hybrid power oxygen sensor is characterized by collecting the battery SOC in real time, and heating the oxygen sensor in advance if the battery SOC is lower than a calibration threshold; and stopping heating the oxygen sensor when the engine is stopped.
2. The gas engine extended-range hybrid oxygen sensor heating control strategy of claim 1, wherein said oxygen sensor is heated in advance, comprising,
setting a lowest calibration threshold, a half power calibration threshold and a highest calibration threshold; on the premise that the engine is not started,
if the battery SOC is lower than the highest calibration threshold, preheating the oxygen sensor;
if the SOC of the battery is lower than a half-power calibration threshold, heating the oxygen sensor to 50% -70% of rated working temperature;
and if the battery SOC is equal to or lower than the minimum calibration threshold, heating the oxygen sensor to the rated working temperature.
3. The gas engine extended-range hybrid oxygen sensor heating control strategy of claim 2, wherein after preheating the oxygen sensor, the preheating temperature of the oxygen sensor is 5 ℃ to 20 ℃ higher than the temperature before the oxygen sensor is not heated, and the preheating temperature of the oxygen sensor is not lower than 30% -40% of the rated operating temperature.
4. The gas engine extended range type hybrid power oxygen sensor heating control strategy according to claim 3, wherein the power-down time required by the battery SOC from the highest calibration threshold to the half-power calibration threshold is obtained, and 40% -60% of the power-down time is taken as the calibration time; and acquiring a temperature rise step according to the preheating temperature, the unheated temperature and the calibrated time length, so as to gradually heat the oxygen sensor by the temperature rise step.
5. A gas engine extended range hybrid oxygen sensor heating control strategy according to claim 4, wherein said step-up distance is determined by the following equation,
in the above formula, deltaT is the temperature rise step distance; t (T) 1 Is the preheating temperature; t (T) 0 Is the temperature before heating; t is the calibration time.
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| CN202311110192.7A CN117211932A (en) | 2023-08-31 | 2023-08-31 | A heating control strategy for a gas engine extended-range hybrid oxygen sensor |
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| CN202311110192.7A CN117211932A (en) | 2023-08-31 | 2023-08-31 | A heating control strategy for a gas engine extended-range hybrid oxygen sensor |
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| CN109630297A (en) * | 2018-11-08 | 2019-04-16 | 潍柴西港新能源动力有限公司 | The lambda sensor control strategy of hybrid vehicle natural gas engine |
| US20190145333A1 (en) * | 2017-11-13 | 2019-05-16 | Ford Global Technologies, Llc | Systems and methods for reducing a light-off time of an oxygen sensor |
| US20200172080A1 (en) * | 2018-11-29 | 2020-06-04 | Hyundai Motor Company | Hybrid vehicle and method for controlling the same |
| US20200191083A1 (en) * | 2018-12-18 | 2020-06-18 | Ford Global Technologies, Llc | Systems and methods for oxygen sensor light-off |
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2023
- 2023-08-31 CN CN202311110192.7A patent/CN117211932A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030172643A1 (en) * | 2002-03-12 | 2003-09-18 | Toyota Jidosha Kabushiki Kaisha | Vehicle control device and control method of the same |
| JP2009281867A (en) * | 2008-05-22 | 2009-12-03 | Autonetworks Technologies Ltd | Heater control device for sensor |
| US20190145333A1 (en) * | 2017-11-13 | 2019-05-16 | Ford Global Technologies, Llc | Systems and methods for reducing a light-off time of an oxygen sensor |
| CN109630297A (en) * | 2018-11-08 | 2019-04-16 | 潍柴西港新能源动力有限公司 | The lambda sensor control strategy of hybrid vehicle natural gas engine |
| CN109324602A (en) * | 2018-11-28 | 2019-02-12 | 潍柴西港新能源动力有限公司 | Oxygen sensor heating control method and system for hybrid vehicle |
| US20200172080A1 (en) * | 2018-11-29 | 2020-06-04 | Hyundai Motor Company | Hybrid vehicle and method for controlling the same |
| US20200191083A1 (en) * | 2018-12-18 | 2020-06-18 | Ford Global Technologies, Llc | Systems and methods for oxygen sensor light-off |
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