阅读说明：本技术 燃油加注错误识别方法 (Fuel filling error recognition method ) 是由 刘彦双 何兵 张旭洲 刘佳熙 程玉佼 刘宁 唐文超 于 2018-09-12 设计创作，主要内容包括：本发明提供了一种燃油加注错误识别方法,通过判断油箱中是否加入燃油,所述燃油包括第一燃油和第二燃油；若所述油箱中加入燃油,发动机进入氧传感器闭环控制和混合气自学习阶段；获取自学习值,并依据所述自学习值获得所述第一燃油和所述第二燃油的比例；以及判断所述燃油是否加注错误。本发明所提供的方法仅通过受发动机电子控制单元(ECU)控制的氧传感器闭环控制和混合气自学习阶段,获取自学习值,实现对燃油加注错误的识别判断,不需要对油箱系统的加油口进行改造和安装油品传感器,也不涉及对动机电子控制单元系统的升级,系统成本低且能够满足车辆对燃油识别的需求,利于在普通双燃料汽车上推广应用。(The invention provides a fuel oil filling error recognition method, which is characterized in that whether fuel oil is added into an oil tank or not is judged, wherein the fuel oil comprises first fuel oil and second fuel oil; if fuel oil is added into the oil tank, the engine enters an oxygen sensor closed-loop control and mixed gas self-learning stage; acquiring a self-learning value, and acquiring the proportion of the first fuel oil and the second fuel oil according to the self-learning value; and judging whether the fuel is filled wrongly. The method provided by the invention obtains the self-learning value only through the oxygen sensor closed-loop control and mixed gas self-learning stages controlled by an Electronic Control Unit (ECU) of the engine, realizes the identification and judgment of fuel oil filling errors, does not need to modify the oil filling port of an oil tank system and install an oil product sensor, does not relate to the upgrading of the electronic control unit system of the engine, has low system cost, can meet the requirement of a vehicle on fuel oil identification, and is beneficial to popularization and application on a common dual-fuel vehicle.)

1. A fuel filling error recognition method is characterized by comprising the following steps:

judging whether fuel oil is added into a fuel tank, wherein the fuel oil comprises first fuel oil and second fuel oil;

if fuel oil is added into the oil tank, the engine enters an oxygen sensor closed-loop control and mixed gas self-learning stage;

acquiring a self-learning value, and acquiring the proportion of the first fuel oil and the second fuel oil according to the self-learning value; and

and judging whether the fuel oil is filled wrongly or not.

2. The fuel mis-fueling identification method of claim 1, wherein if the fuel mis-fueling occurs, notifying a driver of the mis-fueling activity.

3. The fuel filling error recognition method of claim 1, wherein if the fuel filling error occurs, the engine is adjusted according to the fuel proportion control parameter.

4. A method of identifying a fueling error as set forth in claim 1 wherein the step of determining whether fuel is being added to the fuel tank is performed after the key is powered on.

5. The fuel filling error recognition method according to claim 1 or 4, wherein the step of determining whether fuel is filled in the fuel tank includes:

acquiring current liquid level information of the first fuel oil and the second fuel oil, and comparing the current liquid level information of the first fuel oil and the second fuel oil with the liquid level information of the first fuel oil and the second fuel oil when the engine is stopped in the last driving cycle to obtain the oil quantity variation of the first fuel oil and the second fuel oil;

and when the oil quantity variation of the first fuel oil or the second fuel oil is larger than the liquid level fluctuation error threshold value of the oil tank, judging that the fuel oil is added into the oil tank.

6. The method of identifying a fueling error as set forth in claim 1 wherein the step of entering the oxygen sensor closed-loop control and mixture self-learning phase comprises, if fuel is added to said fuel tank: the method comprises the steps that the engine is started completely, mixed gas enters an oxygen sensor closed-loop control stage, if a carbon tank flushing action occurs, fuel oil filling error recognition function calculation is stopped, and after the carbon tank flushing is completed, fuel oil is triggered to enter a self-learning stage based on the oxygen sensor closed-loop control.

7. The fuel fill error identification method of claim 6, wherein the oxygen sensor comprises a front oxygen sensor and a rear oxygen sensor.

8. The method of identifying a fueling error as set forth in claim 7, wherein if the front oxygen sensor or the rear oxygen sensor fails, entering self-learning in a failure mode, and obtaining a self-learning value based on a front oxygen sensor closed-loop control parameter.

9. The method of identifying a fueling error as set forth in claim 8, wherein a self-learned value is obtained based on a pre-oxygen sensor closed-loop control parameter if the oxygen sensor is non-faulty.

10. The method of identifying a fueling error as set forth in claim 1 wherein the ratio of the first fuel or the second fuel in the fuel is determined by looking up a table of the self-learned values.

11. The method of identifying a fueling error as set forth in claim 10, wherein the second fuel is misfueled in the tank of the first fuel if the proportion of the first fuel in the tank of the first fuel is less than a first threshold or the proportion of the second fuel is greater than a second threshold.

12. The method of identifying a fueling error as set forth in claim 10, wherein the first fuel is misfueled in the tank of the second fuel if the proportion of the second fuel in the tank of the second fuel is less than a third threshold or the proportion of the first fuel is greater than a fourth threshold.

Technical Field

The invention relates to the field of automobile electronic manufacturing, in particular to a fuel filling error identification method.

Background

The dual-fuel automobile has various types, and currently, the mainstream equipment is as follows: gasoline/natural gas, gasoline/alcohol fuel, diesel/natural gas, diesel/liquefied petroleum gas, etc., wherein the alcohol fuel is usually methanol or ethanol. The dual-fuel vehicle is usually equipped with two sets of fuel supply systems (such as an oil tank, an oil pump, an oil rail, an oil injector and the like), and for the dual-fuel vehicle with two kinds of fuel both being liquid, the situation that a driver mistakenly adds fuel oil is easy to occur, namely gasoline is added into an alcohol fuel oil tank or alcohol fuel is added into the gasoline tank. After the fuel oil is wrongly filled, the two fuel oils in the oil tank are mixed with each other, the oil product is no longer 100% gasoline or 100% alcohol fuel, on one hand, the oil product is changed, the fuel injection quantity of an Engine Controller (ECU) is still calculated according to the original design logic of the gasoline or the methanol fuel, the influence is caused by the fact that the fuel injection quantity has larger deviation, the power performance and the emission performance of the whole vehicle are influenced, and if the fuel oil is in a cold starting working condition, the problem of engine starting failure is possibly caused; on the other hand, due to different physical and chemical properties of fuels, after the fuels are mistakenly filled into fuel systems, materials of an oil tank, a pipeline and a sealing device are affected by corrosivity and the like, and potential safety hazards are caused.

At present, two methods for identifying wrong fuel filling are mainly adopted in the market, one method is to identify the difference of hardware of a conventional fuel and alcohol fuel tank for judgment through the special design of a fuel tank filling port, and the wrong fuel filling is directly avoided; the other method is that an oil product sensor is installed, the type of fuel oil is actively identified through ECU software, and whether the fuel oil is mistakenly filled is identified. The differential design of an oil filling port of an oil tank needs to modify an oil tank system; the installation of the oil sensor increases the hardware cost, and simultaneously, the ECU software is correspondingly required to be upgraded, the system is relatively high in price, is relatively common on high-end vehicles, and is relatively low in popularization rate on middle and low-end vehicles. Due to the limitation of cost factors, the two functional schemes for identifying the wrong fuel filling are not beneficial to popularization and application on the common dual-fuel automobile.

Disclosure of Invention

The invention aims to provide a fuel oil filling error identification method to solve the problems that system hardware and software need to be changed, so that the cost is high, and the method is not beneficial to popularization and application on a common dual-fuel automobile.

In order to achieve the above object, the present invention provides a fuel filling error recognition method, including the steps of:

judging whether fuel oil is added into a fuel tank, wherein the fuel oil comprises first fuel oil and second fuel oil;

if fuel oil is added into the oil tank, the engine enters an oxygen sensor closed-loop control and mixed gas self-learning stage;

acquiring a self-learning value, and acquiring the proportion of the first fuel oil and the second fuel oil according to the self-learning value; and

and judging whether the fuel oil is filled wrongly or not.

Optionally, if the fuel is filled incorrectly, the driver is notified that incorrect fuel filling action occurs.

Optionally, if the fuel filling is wrong, the engine is adjusted according to the fuel proportion control parameter.

Optionally, the step of judging whether fuel is added into the fuel tank is performed after the key is powered on.

Optionally, the step of judging whether fuel is added into the fuel tank includes:

acquiring current liquid level information of the first fuel oil and the second fuel oil, and comparing the current liquid level information of the first fuel oil and the second fuel oil with the liquid level information of the first fuel oil and the second fuel oil when the engine is stopped in the last driving cycle to obtain the oil quantity variation of the first fuel oil and the second fuel oil;

and when the oil quantity variation of the first fuel oil or the second fuel oil is larger than the liquid level fluctuation error threshold value of the oil tank, judging that the fuel oil is added into the oil tank.

Optionally, if fuel is added into the fuel tank, the step of the engine entering the oxygen sensor closed-loop control and mixed gas self-learning stage comprises: the method comprises the steps that the engine is started completely, mixed gas enters an oxygen sensor closed-loop control stage, if a carbon tank flushing action occurs, fuel oil filling error recognition function calculation is stopped, and after the carbon tank flushing is completed, fuel oil is triggered to enter a self-learning stage based on the oxygen sensor closed-loop control.

Optionally, the oxygen sensor comprises a front oxygen sensor and a rear oxygen sensor.

Optionally, if the front oxygen sensor or the rear oxygen sensor fails, entering a self-learning mode in a failure mode, and acquiring a self-learning value based on a closed-loop control parameter of the front oxygen sensor.

Optionally, if the oxygen sensor has no fault, a self-learning value is obtained based on the closed-loop control parameter of the front oxygen sensor.

Optionally, the self-learning value is subjected to table lookup to determine the proportion of the first fuel oil or the second fuel oil in the fuel oil.

Optionally, if the proportion of the first fuel in the first fuel tank is smaller than a first threshold or the proportion of the second fuel is larger than a second threshold, the second fuel is mistakenly filled in the first fuel tank.

Optionally, if the proportion of the second fuel in the second fuel tank is smaller than a third threshold or the proportion of the first fuel is larger than a fourth threshold, the first fuel is mistakenly filled in the second fuel tank.

In summary, in the fuel filling error identification method provided by the present invention, by determining whether fuel is added to a fuel tank, the fuel includes a first fuel and a second fuel; if fuel oil is added into the oil tank, the engine enters an oxygen sensor closed-loop control and mixed gas self-learning stage; acquiring a self-learning value, and acquiring the proportion of the first fuel oil and the second fuel oil according to the self-learning value; and judging whether the fuel is filled wrongly. The method provided by the invention obtains the self-learning value only through the oxygen sensor closed-loop control and mixed gas self-learning stages controlled by an Electronic Control Unit (ECU) of the engine, realizes the identification and judgment of fuel oil filling errors, does not need to modify the oil filling port of an oil tank system and install an oil product sensor, does not relate to the upgrading of the electronic control unit system of the engine, has low system cost, can meet the requirement of a vehicle on fuel oil identification, and is beneficial to popularization and application on a common dual-fuel vehicle.

Drawings

FIG. 1 is a flow chart of a method for identifying a fueling error according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a fuel filling error identification method according to an embodiment of the present invention.

Detailed Description

The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As described in the background, the existing fuel filling error identification methods mainly include two types: one is that through the special design of the oil tank filler, the differentiation of the hardware of the conventional fuel and alcohol fuel oil tank is identified for judgment, and the wrong fuel oil adding is directly avoided; the other method is that an oil product sensor is installed, the type of fuel oil is actively identified through ECU software, and whether the fuel oil is mistakenly filled is identified. The cost required by the two methods is relatively high, and the two methods are not beneficial to popularization and application on common dual-fuel automobiles

Therefore, in order to solve the above problems in the electronic manufacturing of automobiles, the present invention provides a fuel filling error recognition method.

Referring to fig. 1, fig. 1 is a schematic flow chart of a fuel filling error identification method according to an embodiment of the present invention, and as shown in fig. 1, the fuel filling error identification method includes the following steps:

step S1: judging whether fuel oil is added into a fuel tank, wherein the fuel oil comprises first fuel oil and second fuel oil;

step S2: if fuel oil is added into the oil tank, the engine enters an oxygen sensor closed-loop control and mixed gas self-learning stage;

step S3: acquiring a self-learning value, and acquiring the proportion of the first fuel oil and the second fuel oil according to the self-learning value; and

step S4: and judging whether the fuel oil is filled wrongly or not.

Specifically, referring to fig. 2, fig. 2 is a schematic flow chart executed by the fuel filling error identification method provided in this embodiment, in step S1, after the engine key is powered on, it needs to detect and determine whether fresh fuel is added into the fuel tank, in the previous driving cycle, after the engine is stopped, the electronic engine control unit calculates and stores the liquid level information a0 and b0 of the first fuel and the second fuel in the dual fuel tank, further, after the engine key is powered on, the current liquid level information a1 and b1 of the first fuel and the second fuel in the dual fuel tank are analyzed by the liquid level sensor in the fuel tank, and compared with the first fuel and the second fuel level information a0 and b0 in the dual fuel tank at the time of the previous driving cycle when the engine is stopped, the difference Δ a between the front and rear liquid level information is a1-a0, and Δ b between b1-b0, so as to obtain the variation amount of the first fuel and the second fuel, and when the oil quantity variation delta a of the first fuel oil or the oil quantity variation delta b of the second fuel oil exceeds an oil tank liquid level fluctuation error threshold value caused by factors such as vehicle running jitter and the like, determining that a fuel oil filling action occurs, otherwise, determining that no fresh fuel oil is added.

In step S2, after the engine is started, the air-fuel mixture enters the oxygen sensor closed-loop control stage, where the air-fuel mixture refers to a mixture of air, the first fuel and the second fuel, and the air and the fuel have a certain proportional relationship. Further, if a carbon tank flushing action occurs, the fuel oil filling error recognition function calculation is stopped, and after the carbon tank flushing is completed, fuel oil is triggered to enter a self-learning stage based on oxygen sensor closed-loop control; the specific process is as follows: the oxygen sensor detects the content of oxygen in exhaust gas, the signal is converted into a voltage signal, the voltage signal is fed back to an Electronic Control Unit (ECU) of an engine, the mixed gas is triggered to enter a self-learning stage, namely the electronic control unit of the engine automatically corrects the fuel injection quantity in time according to the feedback signal, so that the air-fuel ratio in the mixed gas is controlled to be close to a standard value, specifically, the air-fuel ratio in the mixed gas is controlled to be close to the standard value through automatically correcting the self-learning value in the self-learning stage, generally, the range of the self-learning value is 0-2, when the self-learning value is equal to 1, the air-fuel ratio in the mixed gas is standard, when the self-learning value is smaller than 1, the mixed gas is too rich, and when the self-learning value is larger than 1, the.

In step S3, the oxygen sensor includes a front oxygen sensor and a rear oxygen sensor, and in the stage of the mixed gas self-learning, if the front oxygen sensor or the rear oxygen sensor fails, the mixed gas self-learning process under a failure mode is entered, a limit value of a self-learning value is increased according to the failure such as an open circuit, a short circuit or an open circuit of the oxygen sensor, and the corrected self-learning value is obtained based on a closed-loop control parameter of the front oxygen sensor; and if the oxygen sensor has no fault, obtaining a corrected self-learning value based on the closed-loop control parameter of the front oxygen sensor.

In step S4, when the mixture self-learning process is completed, the obtained self-learning values are subjected to table lookup calculation to determine the proportion of the first fuel or the second fuel in the fuel. Specifically, the self-learning value and the fuel oil ratio have a certain corresponding relation, and the ratio of the first fuel oil or the second fuel oil in the fuel oil can be obtained through table look-up calculation.

In step S5, if the first fuel tank is filled with the second fuel by mistake, the proportion of the first fuel in the first fuel tank is smaller than a first threshold value or the proportion of the second fuel in the first fuel tank is larger than a second threshold value. If the first fuel is mistakenly filled in the second fuel tank, the proportion of the second fuel in the second fuel tank is smaller than a third threshold value or the proportion of the first fuel in the second fuel tank is larger than a fourth threshold value. Specifically, the first threshold, the second threshold, the third threshold and the fourth threshold are known standards. In one embodiment, the first fuel is gasoline, the second fuel is alcohol fuel, and for the mistaken filling of the alcohol fuel in the gasoline tank, when the fact that the proportion of the gasoline in the gasoline tank is smaller than a first threshold or the proportion of the alcohol fuel is larger than a second threshold is detected, the mistaken filling of the alcohol fuel into the gasoline tank is considered to occur. Similarly, for the alcohol fuel tank, the gasoline fuel is mistakenly added, and when the fact that the proportion of the alcohol fuel in the alcohol fuel tank is smaller than a third threshold value or the proportion of the gasoline is larger than a fourth threshold value is detected, the fact that the gasoline is mistakenly added into the alcohol fuel tank is considered to occur.

Further, when the electronic control unit of the engine detects that the proportion of the first fuel or the second fuel in the mixed fuel is abnormal, the abnormal signal is sent to a fault lamp or an instrument panel, the fault lamp is lightened or the instrument panel displays the information that the action of filling fuel by mistake occurs, and a driver is informed that the action of filling fuel by mistake occurs, so that the driver can replace the fuel in time. Furthermore, in the period from the notification of the occurrence of the fuel mis-filling behavior to the fuel replacement of the driver, the Electronic Control Unit (ECU) of the engine can actively correct parameters such as air intake, fuel injection and ignition of the fuel mis-filling oil way according to the identified first fuel proportion or the identified second fuel proportion, so that the engine can adapt to corresponding mixed fuel, and the dynamic property, the economical efficiency and the emission performance of the engine are ensured. In addition, the driver can select another fuel system to drive the vehicle by pressing a key until the fuel replacement is finished.

In summary, in the fuel filling error identification method provided by the present invention, by determining whether fuel is added to a fuel tank, the fuel includes a first fuel and a second fuel; if fuel oil is added into the oil tank, the engine enters an oxygen sensor closed-loop control and mixed gas self-learning stage; acquiring a self-learning value, and acquiring the proportion of the first fuel oil and the second fuel oil according to the self-learning value; and judging whether the fuel is filled wrongly. The method provided by the invention obtains the self-learning value only through the oxygen sensor closed-loop control and mixed gas self-learning stages controlled by an Electronic Control Unit (ECU) of the engine, realizes the identification and judgment of fuel oil filling errors, does not need to modify the oil filling port of an oil tank system and install an oil product sensor, does not relate to the upgrading of the electronic control unit system of the engine, has low system cost, can meet the requirement of a vehicle on fuel oil identification, and is beneficial to popularization and application on a common dual-fuel vehicle.

Furthermore, the mode of software function package identification of the electronic control unit of the engine is more flexible, convenient and strong in transportability, a man-machine friendly interaction interface is increased, the risk potential of fuel oil wrong injection is reduced, and the Electronic Control Unit (ECU) of the generator can actively correct parameters such as air inlet, oil injection and ignition of a fuel oil way mistakenly injected according to the identified alcohol proportion, so that the engine can adapt to corresponding mixed fuel, and the dynamic property, the economical efficiency and the emission performance of the engine are ensured.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.