A vehicle-mounted fuel quality monitoring and emission abnormality display system and method

Abstract

The present application is suitable for the technical field of vehicle fuel state and pollutant emission data monitoring, and provides a vehicle-mounted fuel quality monitoring and emission abnormality display system and method. An on-board controller records signal values of a first oxygen sensor before and after refueling in a normal driving process. When a difference value exceeds a standard range, a "fuel may be contaminated" fault code is reported. When a second oxygen sensor signal value exceeds a range, a "exhaust emission exceeds a standard" fault code is reported. When a fuel water content sensor signal value exceeds a range, a "fuel water content exceeds a standard" fault code is reported. When a knock sensor signal value exceeds a range, a "poor fuel quality" fault code is reported. Information about the above conditions is uploaded to a display unit, and the display unit displays an abnormality prompt. Problems such as vehicle failure and substandard emission caused by fuel quality are effectively solved, and monitoring and early warning of fuel quality and vehicle emission data are realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle fuel state and pollutant emission data monitoring, and particularly relates to a vehicle-mounted fuel quality monitoring and emission abnormality display system and method. BACKGROUND

[0002] With the development of social economy and the automobile industry, the number of automobiles in use is increasing. In response to the impact of vehicle pollutant emissions, the Environmental Protection Department and the General Administration of Quality Supervision issued the "Light-Duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)", also known as the National VI standard, and the National VI B standard was officially implemented on July 1, 2023.

[0003] According to the standard requirements, each automobile manufacturer must use the vehicle-mounted OBD diagnostic system for detection of the vehicle emission control system. When the OBD node fails to affect emissions, the fault light will be reported. However, before the vehicle itself fails, except for the annual vehicle inspection, the driver currently has no effective way to know the vehicle's emission situation in advance.

[0004] Not only the failure of the vehicle's OBD node affects emissions, but the quality of fuel also directly affects the service life of the vehicle. If the driver unknowingly adds inferior gasoline, it will cause the emissions to be substandard, the vehicle will consider the OBD-related node to be faulty, and an alarm will be reported. Long-term burning of inferior gasoline can also cause the vehicle to have reduced power, blocked oil paths, and increased carbon deposits, and even cause engine damage due to knocking combustion, resulting in engine failure, causing the vehicle to be unable to run, and a series of problems. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a vehicle-mounted fuel quality monitoring and emission abnormality display system and method, which aims to solve the problems raised in the background art.

[0006] The embodiments of the present application are implemented as follows: a vehicle-mounted fuel quality monitoring and emission abnormality display system, comprising:

[0007] a first oxygen sensor for real-time detection of the oxygen concentration in the exhaust gas generated by the engine;

[0008] a second oxygen sensor for real-time detection of the oxygen concentration in the exhaust gas after three-way catalytic purification;

[0009] a water content sensor for detecting the water content of the fuel;

[0010] a knocking sensor for detecting whether the engine produces knocking combustion;

[0011] a vehicle control unit configured to monitor OBD nodes related to emissions on a bus; and

[0012] a display unit configured to receive fault codes (DTC codes) from the vehicle control unit and display corresponding abnormality prompts according to the fault codes provided by the vehicle control unit.

[0013] In a further aspect, when the difference between the signal values of the first oxygen sensor exceeds a standard range during normal driving before and after refueling, the vehicle control unit reports a fault code of "fuel possibly contaminated"; when the signal value of the second oxygen sensor exceeds a standard range, the vehicle control unit reports a fault code of "excessive exhaust emission"; when the signal value of the fuel water content sensor exceeds a range, the vehicle control unit reports a fault code of "excessive fuel water content"; and when the signal value of the knock sensor exceeds a range, the vehicle control unit reports a fault code of "poor fuel quality".

[0014] In a further aspect, the display unit comprises an IC instrument.

[0015] In a further aspect, the sensors that need to acquire parameters in the system further comprise:

[0016] a fuel temperature sensor, a throttle sensor, a fuel quantity sensor, an intake air flow sensor, an intake air pressure sensor, an intake air temperature sensor, etc.

[0017] Another object of the embodiment of the present application is to provide a vehicle-mounted fuel quality monitoring and emission abnormality display method, comprising the following steps:

[0018] Step 1: first determine whether the vehicle enters an ON gear, and if not, the fuel quality monitoring and emission abnormality display system does not work;

[0019] Step 2: after entering the ON gear, the system starts monitoring abnormal states, and if the system detects abnormal messages, reports a DTC code matched with the fault, starts the fuel / emission abnormality display system, sends the fault information to the display unit, and the display unit displays an abnormality prompt;

[0020] Step 3: if there is no abnormality, the vehicle can be switched to a START gear, and the engine starts running, at which time the running state of the vehicle needs to be determined:

[0021] When the vehicle speed is equal to 0 km / h, the vehicle is in a stationary state, the system continuously monitors abnormal states, and if abnormal messages are detected, the processing mode is the same as when the vehicle is in the ON gear, in addition, the gear should be returned to the ON gear, the engine should be turned off, and the driver should check the vehicle condition;

[0022] When the vehicle speed is greater than 0km / h, the system detects an abnormal message, at this time, the vehicle is kept normal driving, the display unit displays an abnormal prompt, and a warning is sent to the driver: it is suggested to stop and check;

[0023] Step 4, if no abnormality is detected in the above process, a monitoring period is taken from the time when the ON gear is entered to the time when the OFF gear is switched or the fuel is refueled once, and the vehicle fuel / emission data of the last period is recorded, and when the next period starts, the two times of data are compared and analyzed.

[0024] Further technical solutions, in the step 2, if the display unit does not correctly display the prompt, the system repeatedly sends the message to the display unit until the prompt is correctly displayed.

[0025] The vehicle-mounted fuel quality monitoring and emission abnormality display system and method provided by the embodiment of the present application, through the vehicle controller monitoring the OBD nodes related to the emission on the bus, recording the signals transmitted by the first oxygen sensor and the second oxygen sensor in real time, obtaining the oxygen concentration parameters, the vehicle controller recording the signal values of the first oxygen sensor in the normal driving process before and after refueling respectively, when the difference is large or exceeds the standard range, reporting the "fuel may be contaminated" fault code; when the signal value of the second oxygen sensor exceeds the range, reporting the "exhaust emission exceeds the standard" fault code; when the signal value of the fuel water content sensor exceeds the range, reporting the "fuel water content exceeds the standard" fault code; when the signal value of the knock sensor exceeds the range, reporting the "poor fuel quality" fault code; and uploading the information of the above situations to the display unit (IC instrument), the IC instrument displays an abnormal prompt, reminding the driver to stop and check. Effectively solve the problems of vehicle failure, emission not meeting the standard and the like caused by fuel quality problems, and realize the monitoring and early warning of the fuel quality and vehicle emission data. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The flowchart of the vehicle-mounted fuel quality monitoring and emission abnormality display system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0028] The specific implementation of the present application is described in detail below in combination with specific embodiments.

[0029] As shown in the drawings, the vehicle-mounted fuel quality monitoring and emission abnormality display system provided by the embodiment of the present application comprises: Figure 1

[0030] ​a first oxygen sensor for detecting oxygen concentration in exhaust gas generated by the engine in real time;

[0031] a second oxygen sensor for detecting oxygen concentration in exhaust gas after three-way catalytic purification in real time;

[0032] a water content sensor for detecting water content of fuel oil;

[0033] a knock sensor for detecting whether knock combustion is generated by the engine;

[0034] a vehicle control unit for monitoring OBD nodes related to emissions on a bus; and

[0035] a display unit for receiving fault codes (DTC codes) from the vehicle control unit and displaying corresponding abnormality prompts according to the fault codes provided by the vehicle control unit.

[0036] In the embodiment of the present application, when the signal value difference of the first oxygen sensor exceeds the standard range during normal driving before and after refueling, the vehicle control unit reports a fault code of “fuel oil may be contaminated”; when the signal value of the second oxygen sensor exceeds the standard range, the vehicle control unit reports a fault code of “exhaust emission exceeds the standard”; when the signal value of the fuel water content sensor exceeds the range, the vehicle control unit reports a fault code of “fuel water content exceeds the standard”; when the signal value of the knock sensor exceeds the range, the vehicle control unit reports a fault code of “poor fuel quality”; the vehicle control unit uploads information of the above situations to the display unit, the display unit displays abnormality prompts to remind the driver to stop and check. The fault code definition is shown in Table 1 (only key parts are listed, and only applicable to this application, does not involve the content defined in SAE J1012 protocol, and can be changed and expanded according to requirements and actual conditions when used):

[0037] Table 1

[0038] DTC code Definition Trigger condition Strategy P1100 Fuel may be contaminated Oxygen sensor A signal value exceeds the standard value range within one ignition cycle after refueling; confirmation fault time: 1 min Report the "fuel may be contaminated, please stop and check the fuel state" prompt; P1101 Exhaust emission exceeds the standard Oxygen sensor B signal value exceeds the standard value range within one ignition cycle after refueling; confirmation fault time: 5 min Report the "emission may not meet the standard, please pay attention" prompt; P1102 Fuel water content exceeds the standard Fuel water content sensor signal value exceeds the standard value range within one ignition cycle after refueling; confirmation fault time: 1 min Report the "fuel may be contaminated, please stop and check the fuel state" prompt; P1103 Poor fuel quality Knock sensor signal value exceeds the normal range within one ignition cycle after refueling; confirmation fault time: 5 min Report the "engine has knock, please stop and check the fuel state" prompt.

[0039] Explanation of emission-related fault codes:

[0040] According to the requirements in SAE J1012, a fault code consists of 5 characters, when the first two characters are P0 or P1, it is an emission-related fault, P1 is used in this system; the third character represents the fault occurrence system, 1, 2 and fuel and air metering related, 3 is engine ignition related fault, 4 is emission control system fault, the last two characters represent the fault occurrence condition;

[0041] In addition to the above-mentioned self-defined part, the whole vehicle throttle position sensor parameter is also referred to at the same time, the opening angle of the throttle valve is considered to affect the air intake, and the influence of altitude and temperature on the oxygen content in the air is also considered, the load value = throttle opening degree / air flow, the nominal value is calculated under the above conditions, compared with the actual oxygen concentration signal, whether the fuel quality and emission situation are abnormal is fed back.

[0042] As a preferred embodiment of the present application, the display unit comprises an IC instrument.

[0043] As a preferred embodiment of the present application, the system has the following definitions for fuel quality monitoring and emission abnormality display.

[0044] The vehicle needs to support the SAE J1979 defined on-board OBD diagnostic standard, support the fault code display format specified in SAE J1012, and the diagnostic data link should meet the requirements of ISO 15765-4.

[0045] As a preferred embodiment of the present application, in the system, the sensors that need to obtain parameters also include:

[0046] Fuel temperature sensor, throttle sensor, fuel quantity sensor, intake air flow sensor, intake air pressure sensor, intake air temperature sensor, etc.

[0047] As a preferred embodiment of the present application, the range of standard values of the first oxygen sensor and the second oxygen sensor is set by adding standard national six type gasoline, lead and silicon containing unconventional element gasoline, water containing gasoline and other qualified and unqualified fuels to the engine respectively, and performing multiple combustion experiments to obtain the average working condition.

[0048] As a preferred embodiment of the present application, in the system, the key signals involved include:

[0049] (1) Tank resistance value signal: used to record the refueling time, when the vehicle is normally driven, the oil quantity decreases, Tank resistance value = 0, the oil quantity rises, the signal jumps from 0 to 1, Tank resistance value = 1, and is marked as a refueling process;

[0050] (2) Oxygen concentration signal: used to record oxygen concentration parameters. The sampling period is the interval between two refuelings. The maximum value Oxygen concentration MAX, the minimum value Oxygen concentration MIN, and the average value Oxygen concentration AVG are recorded. The electronic control unit stores the oxygen concentration parameters within 1km of the journey before and after refueling and calculates the difference Oxygen concentration D-value.

[0051] (3) Knock frequency signal: used to record the knocking situation of fuel combustion;

[0052] (4) Water content signal: Records the water content of fuel.

[0053] An embodiment of the present invention provides a method for on-board fuel quality monitoring and emission anomaly display, comprising the following steps:

[0054] Step 1: First, determine if the vehicle is in the ON position. If it is not in the ON position, the fuel quality monitoring and emission anomaly display system will not work.

[0055] Step 2: After entering the ON position, the system begins to monitor abnormal conditions. If the system detects an abnormal message, it reports the DTC code that matches the fault, activates the fuel / emission abnormality display system, and sends the fault information to the display unit, which then displays an abnormality prompt.

[0056] Step 3: If there are no abnormalities, the vehicle can be switched to START and the engine will start running. At this time, it is necessary to determine the vehicle's operating status:

[0057] When the vehicle speed is 0 km / h and the vehicle is stationary, the system continuously monitors for abnormal conditions. If an abnormal message is detected, the handling method is the same as when the vehicle is in the ON position. In addition, the gear should be returned to the ON position, the engine should be turned off, and the driver should check the vehicle condition.

[0058] When the vehicle speed is greater than 0 km / h, the system detects an abnormal message. At this time, the vehicle continues to drive normally, while the display unit shows an abnormal prompt and issues a warning to the driver: it is recommended to stop and check.

[0059] Step 4: If no abnormalities are detected during the above process, the period from entering the ON position to switching to the OFF position or adding fuel should be considered as one monitoring cycle. Record the vehicle fuel / emission data for the previous cycle, and compare and analyze the two sets of data at the beginning of the next cycle.

[0060] As a preferred embodiment of the present application, in the step 2, if the display unit does not correctly display the prompt, the system repeatedly sends the message to the display unit until the prompt is correctly displayed.

[0061] The above description is merely preferred embodiments of the present application, but not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A vehicle-mounted fuel quality monitoring and emission abnormality display method applied to a vehicle-mounted fuel quality monitoring and emission abnormality display system, the vehicle-mounted fuel quality monitoring and emission abnormality display system comprising: a first oxygen sensor for detecting the oxygen concentration in the exhaust gas generated by the engine in real time; a second oxygen sensor for detecting the oxygen concentration in the exhaust gas after being purified by a three-way catalyst in real time; a water content sensor for detecting the water content of the fuel; a knock sensor for detecting whether the engine generates knock combustion; a vehicle control unit for monitoring the OBD nodes related to emissions on the bus; and a display unit for receiving the fault codes from the vehicle control unit and displaying the corresponding abnormality prompts according to the fault codes provided by the vehicle control unit; when the difference between the signal values of the first oxygen sensor exceeds the standard range during normal driving before and after refueling, the vehicle control unit reports the "fuel may be contaminated" fault code; when the signal value of the second oxygen sensor exceeds the standard range, the vehicle control unit reports the "exhaust emission exceeds the standard" fault code; when the signal value of the fuel water content sensor exceeds the range, the vehicle control unit reports the "fuel water content exceeds the standard" fault code; and when the signal value of the knock sensor exceeds the range, the vehicle control unit reports the "poor fuel quality" fault code; the display unit comprises an IC instrument; the method specifically comprises the following steps: Step 1: First, determine whether the vehicle enters the ON gear, and if not, the fuel quality monitoring and emission abnormality display system does not work; Step 2: After entering the ON gear, the system starts monitoring the abnormal state, and if the system detects an abnormal message, it reports the fault code matched with the fault, starts the fuel quality monitoring and emission abnormality display system, sends the fault code to the display unit, and the display unit displays the abnormality prompt; Step 3: If there is no abnormality, the vehicle switches to the START gear, and the engine starts running, at which time the running state of the vehicle needs to be determined: when the vehicle speed is equal to 0 km / h, the vehicle is in a stationary state, and the system continuously monitors the abnormal state, and if an abnormal message is detected, the processing method is the same as when the vehicle is in the ON gear, and in addition, the gear is returned to the ON gear, the engine is turned off, and the driver checks the vehicle condition; when the vehicle speed is greater than 0 km / h, the system detects an abnormal message, at which time the vehicle is kept normal driving, the display unit displays the abnormality prompt, and a warning is issued to the driver: it is recommended to stop and check; Step 4: If no abnormality is detected in the above steps, entering the ON gear to switching to the OFF gear or refueling once is a monitoring period, and the fuel / emission data of the vehicle in the last period is recorded, and when the next period starts, the two data are compared and analyzed. In the system, the sensors that need to obtain parameters also include a fuel temperature sensor, a throttle sensor, a fuel quantity sensor, an intake air flow sensor, an intake air pressure sensor, and an intake air temperature sensor. In the step 2, if the display unit does not correctly display the prompt, the system repeatedly sends messages to the display unit until the prompt is correctly displayed. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The in-vehicle fuel quality monitoring and emission abnormality display method according to claim 1, characterized by, ​ 3. The in-vehicle fuel quality monitoring and emission abnormality display method according to claim 1, characterized by, ​

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