A development process design method for matching oil level sensor with instrument oil level indication

Abstract

The present invention discloses a development process design method for matching an oil level sensor with an instrument oil level indication, including: S1. Selecting an oil level sensor that meets the clearance design criteria; S2. Selecting a display instrument that meets the oil level display form and accuracy requirements; S3. Setting the corresponding relationship between each volume, height of the oil tank and the resistance value of the oil level sensor; S4. Setting the instrument oil level display strategy of the display instrument; S5. Designing the corresponding instrument software; S6. Fuel tank bench refueling test and instrument software test; S7. Full vehicle oil level filling and fuel indication special test; S8. Outputting the final data, and matching development is completed. The method of the present invention uses the development process of the oil tank oil level sensor development and design, the instrument oil level indication development and design, and the cross-matching of the two to finally determine the respective data to complete the matching development, which can effectively avoid the problem that the output signal of the oil level sensor is inaccurate with the actual oil level and the instrument oil level indication is wrong due to the mismatch between the oil level sensor and the instrument oil level indication.

Description

Technical Field

[0001] The invention relates to the technical field of fuel system development and design, in particular to a development process design method for matching an oil level sensor with an instrument oil level indication. Background Art

[0002] During vehicle development, the instrument oil level indicator is a very important function that affects the customer's intuitive experience. For example, after the customer's tank is full of oil, can the oil level sensor output the signal correctly, can the instrument oil level indicator show the full oil level, etc. In addition to the matching design of the oil level sensor and the instrument oil level indicator when the vehicle is refueling, the matching of the tank oil level sensor and the instrument oil level indicator during driving and parking also requires reasonable design. Summary of the invention

[0003] The purpose of the present invention is to propose a development process design method for matching an oil level sensor with an instrument oil level indication, formulate the working logic of the instrument oil level indication according to the actual oil usage conditions of the vehicle, and at the same time, according to the development process of separate development and design of the fuel tank oil level sensor, development and design of the instrument oil level indication, and cross-matching of the two, finally determine their respective data and complete the matching development, thereby avoiding the problem that the output signal of the oil level sensor is inaccurate with the actual oil level, the instrument oil level indication is wrong, and the customer cannot identify the actual oil amount due to the mismatch between the oil level sensor and the instrument oil level indication.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A development process design method for matching an oil level sensor with an instrument oil level indication includes the following steps:

[0006] S1. Obtain the design data of the target vehicle's fuel system, calibrate the clearance between the pre-selected fuel level sensor and the inner wall of the fuel tank according to the movement trajectory of the pre-selected fuel level sensor from the empty fuel level to the full fuel level, and select the fuel level sensor that meets the fuel system clearance design criteria;

[0007] S2. Select the corresponding display instrument according to the target vehicle's requirements for oil level display format and accuracy;

[0008] S3. According to the design parameters of the target vehicle fuel tank obtained in step S1, the theoretical height of each tank volume is calculated by digital analog calculation, and the resistance distribution, alarm fuel level and empty fuel level of the fuel level sensor are set according to the calculated theoretical height corresponding to each tank volume;

[0009] S4. Setting the oil level display strategy for the display instrument selected in step S2 during low oil level alarm, vehicle power-off to power-on process, and instrument oil level display under different driving conditions;

[0010] S5. Design the corresponding instrument software according to the corresponding relationship between the volume, height and resistance of the fuel level sensor of the fuel tank obtained in step S3, and the fuel level display strategy of the display instrument determined in step S4;

[0011] S6. Load the oil level sensor, display instrument and instrument software determined in the above steps into the fuel tank, and perform bench refueling test and instrument software test respectively. After the refueling test and software test results meet the requirements, execute step S7. Otherwise, modify the corresponding relationship between the volume, height and resistance value of the oil level sensor of the fuel tank according to the test and test results, and execute steps S4-S6 again;

[0012] S7. Assemble the fuel tank in step S6 to the vehicle, conduct a full fuel filling test and a fuel indication special test, and revise and determine the corresponding relationship between the volume, height and resistance of the fuel level sensor of the fuel tank according to the vehicle test results, and further determine the instrument software design;

[0013] S8. End.

[0014] In step S3, the setting requirements for the alarm oil level and the empty oil level are: the alarm oil level setting requirement is to ensure that the vehicle can continue to travel 20 to 80 km; the empty oil level setting requirement is to ensure that the vehicle can continue to travel 20 to 50 km.

[0015] In step S4, the oil level display strategy of the display instrument in the low oil level alarm, the vehicle power-off to power-on process and different driving conditions is set, and the specific contents include:

[0016] Instrument low oil level alarm display setting

[0017] When the available fuel quantity is less than or equal to 13.25% of the declared volume, but greater than the empty fuel level fuel quantity, the low fuel warning light on the display instrument shall illuminate and remain illuminated until the tank is refilled;

[0018] Vehicle power-off and power-on process

[0019] Record the oil level A indicated by the instrument before the vehicle is powered off and the actual oil level C 10 seconds after the power is off. After the vehicle is powered on, collect the oil level information every 100ms, record and calculate the average value B of the 15 oil level information collections. If |BC|≥4L, the instrument uses the B value as the display value after powering on. If |BC|<4L, the instrument uses the A value as the display value after powering on.

[0020] Under different driving conditions

[0021] When the vehicle is running at a normal speed of >3km / h, the instantaneous fuel level F_instant is calculated every 100ms and compared with the current fuel level F_disp displayed on the instrument. If F_instant≥F_disp occurs N times in a row, it indicates that the fuel level is in the rising stage and the instrument displays the F_disp fuel level. If F_instant<F_disp occurs N times in a row, it indicates that the fuel level is in the falling stage and the instrument displays the F_instant fuel level.

[0022] When the vehicle is in normal driving speed ≤3km / h, the engine speed is <300r / min or ≥300r / min but the vehicle gear is in N gear or P gear, the instrument display indicates that the vehicle enters the stop mode, and the instantaneous fuel level F_instant is calculated every 100ms, and a total of 50 values ​​are recorded. The difference between the maximum and minimum values ​​of these 50 fuel level values ​​is calculated. If the difference between the two is ≤0.8L, the average value F_AV of these 50 fuel level values ​​is defined as the effective value. If |F_instant-F_AV|≥4L, the instrument fuel level display enters the fast response mode, and the instrument adjusts the fuel level display to the current fuel tank F_instant within 2s. If |F_instant-F_AV|<4L, the instrument fuel level display enters the slow response mode, and the instrument display changes by 0.01L every 1s.

[0023] When the vehicle is driving normally, with a speed of ≤3 km / h and an engine speed of ≥300 r / min, and if the vehicle gear is not in N or P, the instrument oil level display remains in slow response mode.

[0024] The requirements for the bench refueling test and instrument software test in step S6 are:

[0025] Bench refueling test

[0026] Fuel tank loading status: install the fuel tank on the test bench according to the half-loaded ground line of the vehicle, make the installation point height of the test bench fuel tank and refueling pipe consistent with the vehicle, and ensure that the bottom of the fuel tank test bench coincides with the half-loaded plane of the vehicle;

[0027] Refueling method: refuel the platform in a horizontal plane, then refuel at every 1° tilt in the four directions of X / Y, then refuel at 2° tilt, until refuel at 3° tilt, and refuel at the refueling rates of 15L / min, 30L / min, 38L / min, 45L / min, and 55L / min respectively;

[0028] Ambient temperature 20±2℃, oil temperature 20±2℃, gasoline RVP:>60;

[0029] Test requirements: After each refueling test, the difference between the diesel volume and the rated volume is within ±10% of the rated volume, and the difference between the gasoline volume and the rated volume is within ±5% of the rated volume;

[0030] Software instrument test requirements: The oil level information and response mode displayed by the display instrument during the bench refueling test are consistent with the display instrument oil level display strategy determined in step S4.

[0031] The vehicle full fuel level filling test and fuel indication special test in step S7, the requirements of the vehicle full fuel level filling test are: after the fuel tank is filled to the full fuel level, the difference between the diesel volume and the rated volume is within ±10% of the rated volume; the difference between the gasoline volume and the rated volume is within ±5% of the rated volume; the vehicle fuel indication special test includes: fuel run-out measurement of unusable fuel volume test, fuel tank volume measurement test, fuel display system evaluation test, fuel pointer stability test and vehicle instrument and tank oil level matching test, and each test of the vehicle fuel indication special test must meet the corresponding specification requirements.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention clearly defines the development logic of the oil level indication, which can meet the definition logic of the oil level indication under various working conditions, and can conveniently and quickly guide the subsequent design and development of the fuel system.

[0034] 2. The present invention combines the matching design of the oil level sensor and the instrument oil level indication, and is forward-developed from parts to complete vehicles, thus ensuring the effectiveness and accuracy of the oil level indication.

[0035] 3. The present invention solves the problem of the difficulty in synchronous development of the oil level indicator and the oil level sensor, and provides a reference for the design of the oil level sensor logic circuit diagram, including the design of resistance, voltage, current, etc.

[0036] 4. The present invention defines an experimental method for comparing the oil level during refueling on a test bench with the oil level during refueling on a complete vehicle.

[0037] 5. The vehicle fuel system developed and designed according to the method of the present invention can solve the common problems of the existing fuel system, such as inaccurate instrument indication, failure to indicate full fuel level when refueling, and inaccurate low fuel level indication. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a flow chart of a development process design method for matching an oil level sensor with an instrument oil level indication. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example: See Figure 1 .

[0041] like Figure 1 As shown, a development process design method for matching an oil level sensor with an instrument oil level indication includes the following steps:

[0042] S1. Obtain the design data of the target vehicle's fuel system, calibrate the clearance between the pre-selected fuel level sensor and the inner wall of the fuel tank according to the movement trajectory of the pre-selected fuel level sensor from the empty fuel level to the full fuel level, and select the fuel level sensor that meets the fuel system clearance design criteria;

[0043] S2. Select the corresponding display instrument according to the target vehicle's requirements for oil level display format and accuracy;

[0044] S3. According to the design parameters of the target vehicle fuel tank obtained in step S1, the theoretical height of each tank volume is calculated by digital analog calculation, and the resistance distribution, alarm fuel level and empty fuel level of the fuel level sensor are set according to the calculated theoretical height corresponding to each tank volume;

[0045] S4. Setting the oil level display strategy for the display instrument selected in step S2 during low oil level alarm, vehicle power-off to power-on process, and instrument oil level display under different driving conditions;

[0046] S5. Design the corresponding instrument software according to the corresponding relationship between the volume, height and resistance of the fuel level sensor of the fuel tank obtained in step S3, and the fuel level display strategy of the display instrument determined in step S4;

[0047] S6. Load the oil level sensor, display instrument and instrument software determined in the above steps into the fuel tank, and perform bench refueling test and instrument software test respectively. After the refueling test and software test results meet the requirements, execute step S7. Otherwise, modify the corresponding relationship between the volume, height and resistance value of the oil level sensor of the fuel tank according to the test and test results, and execute steps S4-S6 again;

[0048] S7. Assemble the fuel tank in step S6 to the vehicle, conduct a full fuel filling test and a fuel indication special test, and revise and determine the corresponding relationship between the volume, height and resistance of the fuel level sensor of the fuel tank according to the vehicle test results, and further determine the instrument software design;

[0049] S8. End.

[0050] Specifically, in this embodiment, the accuracy requirements for the oil level of the target vehicle in step S2 are shown in Table 1 below.

[0051] Table 1 Accuracy requirements for oil level sensors in fuel tanks

[0052]

[0053] In step S3, the setting requirements for the alarm oil level and the empty oil level are: the alarm oil level setting requirement is to ensure that the vehicle can continue to travel 20 to 80 km; the empty oil level setting requirement is to ensure that the vehicle can continue to travel 20 to 50 km.

[0054] In step S4, the oil level display strategy of the display instrument in the low oil level alarm, the vehicle power-off to power-on process and different driving conditions is set, and the specific contents include:

[0055] Instrument low oil level alarm display setting

[0056] When the available fuel quantity is less than or equal to 13.25% of the declared volume, but greater than the empty fuel level fuel quantity, the low fuel warning light on the display instrument shall illuminate and remain illuminated until the tank is refilled;

[0057] Vehicle power-off and power-on process

[0058] Record the oil level A indicated by the instrument before the vehicle is powered off and the actual oil level C 10 seconds after the power is off. After the vehicle is powered on, collect the oil level information every 100ms, record and calculate the average value B of the 15 oil level information collections. If |BC|≥4L, the instrument uses the B value as the display value after powering on. If |BC|<4L, the instrument uses the A value as the display value after powering on.

[0059] Under different driving conditions

[0060] When the vehicle is running at a normal speed of >3km / h, the instantaneous fuel level F_instant is calculated every 100ms and compared with the current fuel level F_disp displayed on the instrument. If F_instant≥F_disp occurs N times in a row, it indicates that the fuel level is in the rising stage and the instrument displays the F_disp fuel level. If F_instant<F_disp occurs N times in a row, it indicates that the fuel level is in the falling stage and the instrument displays the F_instant fuel level.

[0061] When the vehicle is in normal driving speed ≤3km / h, the engine speed is <300r / min or ≥300r / min but the vehicle gear is in N gear or P gear, the instrument display indicates that the vehicle enters the stop mode, and the instantaneous fuel level F_instant is calculated every 100ms, and a total of 50 values ​​are recorded. The difference between the maximum and minimum values ​​of these 50 fuel level values ​​is calculated. If the difference between the two is ≤0.8L, the average value F_AV of these 50 fuel level values ​​is defined as the effective value. If |F_instant-F_AV|≥4L, the instrument fuel level display enters the fast response mode, and the instrument adjusts the fuel level display to the current fuel tank F_instant within 2s. If |F_instant-F_AV|<4L, the instrument fuel level display enters the slow response mode, and the instrument display changes by 0.01L every 1s.

[0062] When the vehicle is driving normally, with a speed of ≤3 km / h and an engine speed of ≥300 r / min, and if the vehicle gear is not in N or P, the instrument oil level display remains in slow response mode.

[0063] The requirements for the bench refueling test and instrument software test in step S6 are:

[0064] Bench refueling test

[0065] Fuel tank loading status: install the fuel tank on the test bench according to the half-loaded ground line of the vehicle, make the installation point height of the test bench fuel tank and refueling pipe consistent with the vehicle, and ensure that the bottom of the fuel tank test bench coincides with the half-loaded plane of the vehicle;

[0066] Refueling method: refuel the platform in a horizontal plane, then refuel at every 1° tilt in the four directions of X / Y, then refuel at 2° tilt, until refuel at 3° tilt, and refuel at the refueling rates of 15L / min, 30L / min, 38L / min, 45L / min, and 55L / min respectively;

[0067] Ambient temperature 20±2℃, oil temperature 20±2℃, gasoline RVP:>60;

[0068] Test requirements: After each refueling test, the difference between the diesel volume and the rated volume is within ±10% of the rated volume, and the difference between the gasoline volume and the rated volume is within ±5% of the rated volume;

[0069] Specifically, the record form of the bench refueling test described in this embodiment is shown in Table 2 below.

[0070] Table 2 Fuel tank bench refueling test result record

[0071]

[0072] Software instrument test requirements: The oil level information and response mode displayed by the display instrument during the bench refueling test are consistent with the display instrument oil level display strategy determined in step S4.

[0073] The vehicle full fuel level filling test and fuel indication special test in step S7, the requirements of the vehicle full fuel level filling test are: after the fuel tank is filled to the full fuel level, the difference between the diesel volume and the rated volume is within ±10% of the rated volume; the difference between the gasoline volume and the rated volume is within ±5% of the rated volume; the vehicle fuel indication special test includes: fuel run-out measurement of unusable fuel volume test, fuel tank volume measurement test, fuel display system evaluation test, fuel pointer stability test and vehicle instrument and tank oil level matching test, and each test of the vehicle fuel indication special test must meet the corresponding specification requirements.

[0074] Specifically, the vehicle fuel indicator special test result record table described in this embodiment is shown in Table 3 below.

[0075] Table 3 Vehicle fuel indication special test result record

[0076]

[0077] In summary, the development process design method for matching the oil level sensor with the instrument oil level indication of the present invention formulates the working logic of the instrument oil level indication and the instrument oil level display strategy according to the customer's oil usage conditions. At the same time, according to the development process of the separate development and design of the fuel tank oil level sensor, the development and design of the instrument oil level indication, and the cross-matching of the two, the respective data are finally determined to complete the matching development, which can effectively avoid the problem that the output signal of the oil level sensor is inaccurate with the actual oil level, the instrument oil level indication is wrong, and the customer cannot identify the actual oil amount due to the mismatch between the oil level sensor and the instrument oil level indication.

[0078] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A development process design method for matching an oil level sensor with an instrument oil level indication, characterized in that: The following steps are involved: S1. Obtain the design data of the target vehicle's fuel system, calibrate the clearance between the pre-selected fuel level sensor and the inner wall of the fuel tank according to the movement trajectory of the pre-selected fuel level sensor from the empty fuel level to the full fuel level, and select the fuel level sensor that meets the fuel system clearance design criteria; S2. Select the corresponding display instrument according to the target vehicle's requirements for oil level display format and accuracy; S3. According to the design parameters of the target vehicle fuel tank obtained in step S1, the theoretical height of each tank volume is calculated by digital analog calculation, and the resistance distribution, alarm fuel level and empty fuel level of the fuel level sensor are set according to the calculated theoretical height corresponding to each tank volume; S4. Setting the oil level display strategy for the display instrument selected in step S2 during low oil level alarm, vehicle power-off to power-on process, and instrument oil level display under different driving conditions; Instrument low oil level alarm display setting When the available fuel quantity is less than or equal to 13.25% of the declared volume, but greater than the empty fuel level fuel quantity, the low fuel warning light on the display instrument shall illuminate and remain illuminated until the tank is refilled; Vehicle power-off and power-on process Record the oil level A indicated by the instrument before the vehicle is powered off and the actual oil level C 10 seconds after the power is off. After the vehicle is powered on, collect the oil level information every 100ms, record and calculate the average value B of the 15 oil level information collections. If |BC|≥4L, the instrument uses the B value as the display value after powering on. If |BC|<4L, the instrument uses the A value as the display value after powering on. Under different driving conditions When the vehicle is running at a normal speed of >3km / h, the instantaneous fuel level F_instant is calculated every 100ms and compared with the current fuel level F_disp displayed on the instrument. If F_instant≥F_disp occurs N times in a row, it indicates that the fuel level is in the rising stage and the instrument displays the F_disp fuel level. If F_instant<F_disp occurs N times in a row, it indicates that the fuel level is in the falling stage and the instrument displays the F_instant fuel level. When the vehicle is in normal driving speed ≤3km / h, the engine speed is <300r / min or ≥300r / min but the vehicle gear is in N gear or P gear, the instrument display indicates that the vehicle enters the stop mode, and the instantaneous fuel level F_instant is calculated every 100ms, and a total of 50 values ​​are recorded. The difference between the maximum and minimum values ​​of these 50 fuel level values ​​is calculated. If the difference between the two is ≤0.8L, the average value F_AV of these 50 fuel level values ​​is defined as the effective value. If |F_instant-F_AV|≥4L, the instrument fuel level display enters the fast response mode, and the instrument adjusts the fuel level display to the current fuel tank F_instant within 2s. If |F_instant-F_AV|<4L, the instrument fuel level display enters the slow response mode, and the instrument display changes by 0.01L every 1s. When the vehicle is driving normally, the speed is ≤3 km / h and the engine speed is ≥300 r / min. If the vehicle gear is not in N or P, the instrument oil level display remains in slow response mode. S5. Design the corresponding instrument software according to the corresponding relationship between the volume, height and resistance of the fuel level sensor of the fuel tank obtained in step S3, and the fuel level display strategy of the display instrument determined in step S4; S6. Load the oil level sensor, display instrument and instrument software determined in the above steps into the fuel tank, and perform bench refueling test and instrument software test respectively. After the refueling test and software test results meet the requirements, execute step S7. Otherwise, modify the corresponding relationship between the volume, height and resistance value of the oil level sensor of the fuel tank according to the test and test results, and execute steps S4-S6 again; The requirements for bench refueling test and instrument software test are: Bench refueling test Fuel tank loading status: install the fuel tank on the test bench according to the half-loaded ground line of the vehicle, make the installation point height of the test bench fuel tank and refueling pipe consistent with the vehicle, and ensure that the bottom of the fuel tank test bench coincides with the half-loaded plane of the vehicle; Refueling method: refuel the platform in a horizontal plane, then refuel at an angle of 1° in the four directions of X / Y, then refuel at an angle of 2°, until refuel at an angle of 3°. The refueling rates are 15L / min, 30L / min, 38L / min, 45L / min, and 55L / min respectively; Ambient temperature 20±2℃, oil temperature 20±2℃, gasoline RVP:>60; Test requirements: After each refueling test, the difference between the diesel volume and the rated volume is within ±10% of the rated volume, and the difference between the gasoline volume and the rated volume is within ±5% of the rated volume; Software instrument test requirements: The oil level information and response mode displayed by the display instrument during the bench refueling test are consistent with the oil level display strategy of the display instrument determined in step S4; S7. Assemble the fuel tank in step S6 to the vehicle, conduct a full fuel filling test and a fuel indication special test, and revise and determine the corresponding relationship between the volume, height and resistance of the fuel level sensor of the fuel tank according to the vehicle test results, and further determine the instrument software design; S8. Output the instrument software that finally corresponds to the volume, height and resistance value of the oil level sensor of the oil tank, and end.

2. The development process design method for matching an oil level sensor with an instrument oil level indication according to claim 1 is characterized in that: In step S3, the setting requirements for the alarm oil level and the empty oil level are: the alarm oil level setting requirement is to ensure that the vehicle can continue to travel 20 to 80 km; the empty oil level setting requirement is to ensure that the vehicle can continue to travel 20 to 50 km.

3. The development process design method for matching an oil level sensor with an instrument oil level indication according to claim 1 is characterized in that: The vehicle full fuel filling test and fuel indication special test in step S7, the vehicle full fuel filling test requirement is: after the fuel tank is filled to the full fuel level, the difference between the diesel volume and the rated volume is within ±10% of the rated volume; The difference between gasoline volume and rated volume is within ±5% of the rated volume; The vehicle fuel indication special test includes: fuel run-out measurement of unusable fuel volume test, fuel tank volume measurement test, fuel display system evaluation test, fuel pointer stability test and vehicle instrument and tank oil level matching test. Each test of the vehicle fuel indication special test must meet the corresponding specification requirements.

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