Engine oil quantity detection method and system, vehicle terminal and vehicle

Abstract

The application discloses an engine oil quantity detection method and system, a vehicle-mounted terminal and a vehicle. The engine oil quantity detection method comprises the following steps: acquiring an oil quantity temperature rising model of an engine and oil temperature data and an operation condition in a temperature rising process; determining an actual temperature rising curve of the engine according to the oil temperature data; and determining oil quantity information of the engine based on the oil quantity temperature rising model, the actual temperature rising curve and the operation condition. After the actual temperature rising curve is determined according to the oil temperature data, the oil quantity information of the engine can be obtained according to the actual temperature rising curve, the operation condition and the oil quantity temperature rising model. The actual temperature rising curve can reflect the change of the actual temperature of the engine oil with time, and compared with the change of the temperature of the engine oil with time under a certain oil quantity and a certain operation condition in the oil quantity temperature rising model, the correlation between the oil quantity in the engine and the certain oil quantity in the oil quantity temperature rising model can be determined, so that the oil quantity information of the engine is obtained, and the steps are simple and the time consumption is less.

Description

Technical Field

[0001] This application relates to the field of automotive engine lubrication system technology, specifically to an engine oil quantity detection method and system, an on-board terminal, and a vehicle. Background Technology

[0002] The function of the engine lubrication system is to continuously deliver a sufficient quantity of clean engine oil at the appropriate temperature to all friction pairs, hydraulic components, and surfaces of parts requiring cooling during engine operation. Due to the structural characteristics of the engine, oil consumption is inevitable during engine operation. To ensure the reliable operation of the lubrication system, the oil level needs to be checked regularly.

[0003] In the prior art, engines are usually equipped with level gauges such as oil level gauges, ultrasonic level gauges, and float level gauges to measure the oil level. However, measuring the oil level in an engine using a level gauge is a complicated and time-consuming process. Summary of the Invention

[0004] This application provides an engine oil level detection method and system, an on-board terminal, and a vehicle to solve the technical problem in related technologies where measuring the engine oil level using a level gauge involves cumbersome and time-consuming measurement steps.

[0005] The first aspect of this application provides a method for detecting the fuel level of an engine, comprising the following steps:

[0006] Acquire the engine's oil temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process;

[0007] Based on the oil temperature data, determine the actual temperature rise curve of the engine;

[0008] Based on the oil quantity temperature rise model, the oil quantity information of the engine is determined according to the actual temperature rise curve and the operating conditions.

[0009] Based on the aforementioned technical methods, after determining the actual temperature rise curve using oil temperature data, the engine's oil quantity information can be obtained according to the actual temperature rise curve, operating conditions, and oil quantity temperature rise model. The actual temperature rise curve reflects the actual temperature change of the engine oil over time. By comparing this with the temperature change of the engine oil over time under a certain oil quantity and operating conditions in the oil quantity temperature rise model, the correlation between the amount of engine oil in the engine and a certain oil quantity in the oil quantity temperature rise model can be determined, thus obtaining the engine's oil quantity information. The process is simple and time-efficient.

[0010] Optionally, the oil quantity temperature rise model includes: the calibrated temperature rise curve of the engine under operating conditions and critical oil quantity; the engine oil quantity information includes: the engine oil quantity is equal to or lower than the critical oil quantity; the step of determining the engine oil quantity information based on the oil quantity temperature rise model, according to the actual temperature rise curve and the operating conditions, includes:

[0011] When the slope of the actual temperature rise curve is greater than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is lower than the critical oil quantity.

[0012] When the slope of the actual temperature rise curve is equal to the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is equal to the critical oil quantity.

[0013] According to the above technical means, if the slope of the actual temperature rise curve is greater than the slope of the calibrated temperature rise curve, it indicates that the temperature of the actual temperature rise curve rises faster, and the engine oil quantity is lower than the critical oil quantity; if the slope of the actual temperature rise curve is equal to the slope of the calibrated temperature rise curve, it indicates that the temperature rise of the actual temperature rise curve is consistent with the temperature rise of the calibrated temperature rise curve, and the engine oil quantity is equal to the critical oil quantity, thus determining that the engine oil quantity is equal to or lower than the critical oil quantity.

[0014] Optionally, the engine fuel quantity information further includes: the engine fuel quantity is higher than the critical fuel quantity; the step of determining the engine fuel quantity information based on the fuel quantity temperature rise model, according to the actual temperature rise curve and the operating conditions, further includes:

[0015] When the slope of the actual temperature rise curve is less than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is higher than the critical oil quantity.

[0016] According to the above technical means, if the slope of the actual temperature rise curve is less than the slope of the calibrated temperature rise curve, it indicates that the temperature rises more slowly in the actual temperature rise curve. Therefore, the oil quantity of the engine is higher than the critical oil quantity, thus determining that the oil quantity of the engine is higher than the critical oil quantity.

[0017] Optionally, the engine oil level detection method further includes the step of:

[0018] When the engine's fuel level is equal to or lower than the critical fuel level, a fuel level warning message is issued.

[0019] Based on the aforementioned technical means, an oil level warning message is issued, prompting the user to add engine oil to ensure that the engine oil level is above the critical level, thereby preventing engine damage.

[0020] Optionally, the oil quantity temperature rise model further includes: the calibrated temperature rise curve of the engine under operating conditions and non-critical oil quantity; the engine oil quantity information further includes: the engine oil quantity value; the step of determining the engine oil quantity information based on the oil quantity temperature rise model, according to the actual temperature rise curve and the operating conditions, includes:

[0021] Based on the oil quantity temperature rise model, the calibration temperature rise curve under the corresponding operating conditions is determined according to the actual temperature rise curve, and the non-critical oil quantity corresponding to the calibration temperature rise curve is taken as the oil quantity value of the engine.

[0022] Based on the above technical means, the noncritical oil temperature corresponding to the calibrated temperature rise curve is used as the oil quantity value of the engine, thereby obtaining a more specific oil quantity value.

[0023] Optionally, acquiring the engine's oil volume temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process, includes:

[0024] In response to a detection command, the engine's initial state information and oil temperature rise model are acquired; wherein, the initial state information includes: the engine's initial coolant temperature and initial oil temperature;

[0025] When the initial state information meets the oil quantity detection conditions, the engine is controlled to operate under the operating conditions, and the oil temperature data of the engine during the warm-up process is acquired; wherein, the oil quantity detection conditions include: the initial coolant temperature is less than or equal to the first preset coolant temperature, and the initial oil temperature is less than or equal to the first preset oil temperature.

[0026] Based on the above technical means, the initial state information of the engine is first judged. If the initial state information of the engine meets the oil quantity detection conditions, the oil quantity is detected, and the engine is controlled to work under the operating conditions to obtain the oil temperature data of the engine during the heating process, thereby obtaining the operating conditions and oil temperature data.

[0027] Optionally, the detection command includes: a user detection command; the initial state information further includes: at least one of the following: vehicle speed, vehicle gear, and the open / closed state of the engine radiator; the fuel level detection conditions further include: at least one of the following: vehicle speed is 0, gear is parking or neutral, and engine radiator is closed.

[0028] By using the above-mentioned technical methods, the influence of other factors on the engine oil temperature data can be reduced, making the oil temperature data more accurate.

[0029] Optionally, the detection command further includes: an engine start command; the engine warming process is that the coolant temperature rises from the initial coolant temperature to the second preset coolant temperature, or the oil temperature rises from the initial oil temperature to the second preset oil temperature; wherein, the second preset coolant temperature is greater than the first preset coolant temperature, and the second preset oil temperature is greater than the first preset oil temperature.

[0030] Based on the above technical means, the temperature range of the heating process is limited, thereby limiting the detection time.

[0031] Optionally, the first preset coolant temperature and the first preset oil temperature are both determined based on the highest air temperature in the geographical area where the engine is located.

[0032] Based on the above technical means, the engine coolant temperature and the engine oil temperature are prevented from exceeding the first preset coolant temperature and the first preset oil temperature due to rising air temperature, ensuring that the oil level cannot be detected due to excessively high air temperature.

[0033] Optionally, the oil volume temperature rise model is obtained using the following steps:

[0034] For each operating condition of the engine, the theoretical temperature rise curve corresponding to each test oil quantity is calculated based on the heat generated by the engine. The operating conditions include at least one of a predetermined operating condition and an unpredictable operating condition, and the test oil quantity includes at least one of a critical oil quantity and an uncritical oil quantity.

[0035] Configure the engine's oil level as the test oil level, control the engine to operate under corresponding operating conditions, and acquire the engine's oil temperature test data;

[0036] Based on the engine oil temperature test data, the test temperature rise curve corresponding to the test oil volume of the engine is obtained;

[0037] The theoretical temperature rise curve is corrected based on the test temperature rise curve to obtain the calibrated temperature rise curve of the engine under operating conditions and test oil quantity, so as to form an oil quantity temperature rise model.

[0038] Based on the above technical means, when establishing the engine oil temperature rise model, different operating conditions and different test oil volumes are considered to establish a more accurate oil temperature rise model.

[0039] Optionally, the engine includes: engines with different operating mileages, the oil temperature test data of the engine includes: oil temperature test data of engines with different operating mileages, and the calibration temperature rise curve of the engine under operating conditions and test oil volume includes: calibration temperature rise curve of engines with different operating mileages under operating conditions and test oil volume.

[0040] Based on the aforementioned technical means, and taking into account engines with different operating mileages, the accuracy of the oil temperature rise model can be further improved.

[0041] Optionally, the calibration temperature rise curve of the engine under operating conditions and critical fuel quantity includes: the calibration temperature rise curve of the engine under predetermined operating conditions and critical fuel quantity; the fuel quantity temperature rise model is obtained through the following steps:

[0042] Based on the heat generated by the engine under predetermined operating conditions, calculate the theoretical temperature rise curve corresponding to the critical oil quantity of the engine.

[0043] Obtain the actual oil temperature data corresponding to the critical oil quantity when the engine of different vehicles is working under predetermined operating conditions;

[0044] Based on the actual oil temperature data, the theoretical temperature rise curve corresponding to the critical oil quantity of the engine is corrected to obtain the calibrated temperature rise curve of the engine under predetermined operating conditions and critical oil quantity, so as to form an oil quantity temperature rise model.

[0045] Based on the above technical means, and combined with the engine of different vehicles, the accuracy of the calibrated temperature rise curve of the engine under predetermined operating conditions and critical oil quantity is further improved.

[0046] Optionally, the actual oil temperature data corresponding to the critical oil quantity when the engines of different vehicles are operating under predetermined conditions includes: the actual oil temperature data corresponding to the critical oil quantity when the engines of different vehicles and different mileages are operating under predetermined conditions, and the calibration temperature rise curve of the engine under predetermined conditions and critical oil quantity includes: the calibration temperature rise curve of the engines of different vehicles and different mileages under predetermined conditions and critical oil quantity.

[0047] Based on the above technical means, and combined with engines of different vehicles and different operating mileages, the accuracy of the calibrated temperature rise curve of the engine under predetermined operating conditions and critical oil quantity can be further improved.

[0048] A second aspect of this application provides an engine fuel level detection system, comprising:

[0049] The acquisition module is used to acquire the engine's oil volume temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process;

[0050] The temperature rise curve module is used to determine the actual temperature rise curve of the engine based on the oil temperature data;

[0051] The fuel quantity module is used to determine the fuel quantity information of the engine based on the fuel quantity temperature rise model, the actual temperature rise curve, and the operating conditions.

[0052] Optionally, the oil quantity temperature rise model includes: the calibrated temperature rise curve of the engine under operating conditions and critical oil quantity; the engine oil quantity information includes: the engine oil quantity is equal to or lower than the critical oil quantity; the oil quantity module is specifically used to determine that when the slope of the actual temperature rise curve is greater than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the engine oil quantity is lower than the critical oil quantity; when the slope of the actual temperature rise curve is equal to the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the engine oil quantity is equal to the critical oil quantity.

[0053] Optionally, the engine fuel quantity information further includes: the engine fuel quantity is higher than the critical fuel quantity; the fuel quantity module is specifically used to indicate that the engine fuel quantity is higher than the critical fuel quantity when the slope of the actual temperature rise curve is less than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical fuel quantity.

[0054] Optionally, the oil quantity detection system further includes:

[0055] The sending module is used to send a fuel level warning message when the fuel level of the engine is equal to or lower than the critical fuel level.

[0056] Optionally, the oil quantity temperature rise model further includes: the calibration temperature rise curve of the engine under operating conditions and non-critical oil quantity; the oil quantity information of the engine further includes: the oil quantity value of the engine; the oil quantity module is specifically used to determine the calibration temperature rise curve under the operating conditions corresponding to the actual temperature rise curve based on the oil quantity temperature rise model, and to use the non-critical oil quantity corresponding to the calibration temperature rise curve as the oil quantity value of the engine.

[0057] Optionally, the acquisition module is specifically used to acquire the initial state information of the engine and the oil temperature rise model in response to a detection command; wherein, the initial state information includes: the initial coolant temperature and the initial oil temperature of the engine; when the initial state information meets the oil temperature detection conditions, the engine is controlled to operate under the operating conditions, and the oil temperature data of the engine during the temperature rise process is acquired; wherein, the oil temperature detection conditions include: the initial coolant temperature is less than or equal to a first preset coolant temperature, and the initial oil temperature is less than or equal to a first preset oil temperature.

[0058] Optionally, the detection command includes: a user detection command; the initial state information further includes: at least one of the following: vehicle speed, vehicle gear, and the open / closed state of the engine radiator; the fuel level detection conditions further include: at least one of the following: vehicle speed is 0, gear is parking or neutral, and engine radiator is closed.

[0059] Optionally, the detection command further includes: an engine start command; the engine warming process is that the coolant temperature rises from the initial coolant temperature to the second preset coolant temperature, or the oil temperature rises from the initial oil temperature to the second preset oil temperature; wherein, the second preset coolant temperature is greater than the first preset coolant temperature, and the second preset oil temperature is greater than the first preset oil temperature.

[0060] Optionally, the first preset coolant temperature and the first preset oil temperature are both determined based on the highest air temperature in the geographical area where the engine is located.

[0061] Optionally, the oil volume temperature rise model is obtained using the following steps:

[0062] For each operating condition of the engine, the theoretical temperature rise curve corresponding to each test oil quantity is calculated based on the heat generated by the engine. The operating conditions include at least one of a predetermined operating condition and an unpredictable operating condition, and the test oil quantity includes at least one of a critical oil quantity and an uncritical oil quantity.

[0063] Configure the engine's oil level as the test oil level, control the engine to operate under corresponding operating conditions, and acquire the engine's oil temperature test data;

[0064] Based on the engine oil temperature test data, the test temperature rise curve corresponding to the test oil volume of the engine is obtained;

[0065] The theoretical temperature rise curve is corrected based on the test temperature rise curve to obtain the calibrated temperature rise curve of the engine under operating conditions and test oil quantity, so as to form an oil quantity temperature rise model.

[0066] Optionally, the engine includes: engines with different operating mileages, the oil temperature test data of the engine includes: oil temperature test data of engines with different operating mileages, and the calibration temperature rise curve of the engine under operating conditions and test oil volume includes: calibration temperature rise curve of engines with different operating mileages under operating conditions and test oil volume.

[0067] Optionally, the calibration temperature rise curve of the engine under operating conditions and critical fuel quantity includes: the calibration temperature rise curve of the engine under predetermined operating conditions and critical fuel quantity; the fuel quantity temperature rise model is obtained through the following steps:

[0068] Based on the heat generated by the engine under predetermined operating conditions, calculate the theoretical temperature rise curve corresponding to the critical oil quantity of the engine.

[0069] Obtain the actual oil temperature data corresponding to the critical oil quantity when different engines are operating under predetermined conditions;

[0070] Based on the actual oil temperature data, the theoretical temperature rise curve corresponding to the critical oil quantity of the engine is corrected to obtain the calibrated temperature rise curve of the engine under predetermined operating conditions and critical oil quantity, so as to form an oil quantity temperature rise model.

[0071] Optionally, the actual oil temperature data corresponding to the critical oil quantity when the different engines are operating under predetermined conditions includes: the actual oil temperature data corresponding to the critical oil quantity when the engines are operating under predetermined conditions at different mileages, and the calibration temperature rise curve of the engine under predetermined conditions and critical oil quantity includes: the calibration temperature rise curve of the engine under predetermined conditions and critical oil quantity at different mileages.

[0072] A third aspect of this application provides an in-vehicle terminal, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the engine oil level detection method as described in the above embodiments.

[0073] A fourth aspect of this application provides a vehicle, including: an engine oil level detection system as described in the above embodiments, or an on-board terminal as described in the above embodiments.

[0074] The beneficial effects of this application are as follows: After determining the actual temperature rise curve through oil temperature data, the engine oil quantity information can be obtained based on the actual temperature rise curve, operating conditions, and oil quantity temperature rise model. The actual temperature rise curve reflects the actual temperature change of the engine oil over time. By comparing this with the temperature change of the engine oil over time under a certain oil quantity and operating conditions in the oil quantity temperature rise model, the correlation between the amount of engine oil in the engine and a certain oil quantity in the oil quantity temperature rise model can be determined, thus obtaining the engine oil quantity information. The steps are simple and time-saving. Attached Figure Description

[0075] Figure 1 This is a flowchart of an engine oil quantity detection method according to an embodiment of this application;

[0076] Figure 2 This is a flowchart of a method for establishing an oil volume temperature rise model according to a specific embodiment of this application;

[0077] Figure 3 This is a flowchart of a method for establishing a calibration temperature rise curve of an engine under predetermined operating conditions and critical oil quantity according to a specific embodiment of this application;

[0078] Figure 4 This is a schematic diagram illustrating the change in engine oil temperature over time when the amount of engine oil in the engine varies with different parameters, according to a specific embodiment of this application. Detailed Implementation

[0079] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0080] Please also refer to Figure 1 and Figure 4 This application provides some embodiments of an engine oil quantity detection method.

[0081] The engine oil quantity detection method provided in the embodiments of this application includes the following steps:

[0082] Step S100: Obtain the engine oil temperature rise model, oil temperature data and operating conditions during the temperature rise process.

[0083] Step S200: Determine the actual temperature rise curve of the engine based on the oil temperature data.

[0084] Step S300: Based on the oil quantity heating model, determine the engine oil quantity information according to the actual heating curve and operating conditions.

[0085] Specifically, an engine refers to a machine that provides power, including automotive engines, aircraft engines, etc. Engines contain engine oil, which plays a role in lubrication and friction reduction, auxiliary cooling, sealing against leaks, rust and corrosion prevention, and shock absorption. Oil temperature data refers to the actual temperature of the engine oil. Engines are equipped with temperature sensors to collect the actual temperature of the engine oil. After the engine starts, its actual temperature rises, and the oil temperature data during this warm-up process can be collected using the temperature sensor. The actual warm-up curve is the curve showing the actual temperature of the engine oil changing over time. The oil quantity warm-up model is a model showing the temperature change of the engine oil over time when a certain amount of oil is present in the engine. Oil quantity refers to the amount of oil in the engine, and oil quantity information reflects the amount of oil. Operating conditions refer to the operating conditions under which the engine runs. After the engine starts according to these operating conditions and enters the warm-up process, oil temperature data during this process can be obtained. Operating conditions include predetermined operating conditions and undetermined operating conditions. Predetermined operating conditions refer to pre-set operating conditions under which the engine can operate at a predetermined speed, at a predetermined power, or at a predetermined torque. Predetermined operating conditions are typically the operating conditions during engine startup and are also one type of operating condition used to establish an oil temperature rise model. Undetermined operating conditions refer to operating conditions other than predetermined conditions. In undetermined operating conditions, the speed, power, and torque can all be different from the predetermined speed, power, and torque.

[0086] Because the amount of engine oil in the engine varies, the oil temperature also changes differently over time. For example, assuming the engine generates a constant amount of heat, the more oil there is, the slower the oil temperature rises; the less oil there is, the faster the oil temperature rises. Figure 4 As shown, the oil volume can be 2.0L, 2.5L, 3.0L, 3.5L, 4.0L, etc. The less oil, the faster the oil temperature rises and the steeper the slope; the more oil, the slower the oil temperature rises and the shallower the slope. The time required for the oil temperature to rise from 20℃ to 39℃ or 58℃ is 120 seconds, which is relatively short. Different operating conditions result in different oil temperature changes over time. For example, less heat generated during operation leads to a slower oil temperature rise, while more heat generated leads to a faster temperature rise. After determining the actual temperature rise curve using oil temperature data, the engine oil volume information can be obtained based on the actual temperature rise curve, operating conditions, and the oil volume temperature rise model. The actual temperature rise curve can reflect the actual temperature change of the engine oil over time. By comparing it with the temperature change of the engine oil over time under a certain oil volume and certain operating conditions in the oil volume temperature rise model, the correlation between the amount of engine oil in the engine and a certain amount of oil in the oil volume temperature rise model can be determined, thereby obtaining the engine oil volume information. The steps are simple and time-saving. The oil volume detection method of this application does not require the configuration of a liquid level measuring device.

[0087] The operating condition of the oil volume temperature rise model can be a single operating condition, such as a predetermined operating condition; or it can be at least two operating conditions, such as a predetermined operating condition and at least one unpredictable operating condition. The defined oil volume in the oil volume temperature rise model can be a single value or multiple values. For example, when the defined oil volume in the oil volume temperature rise model is a single value, the actual temperature rise curve and the oil volume temperature rise model can determine that the engine's oil volume information can be higher than, lower than, or equal to that value. For example, if the oil volume value is a critical oil volume, it can be determined that the engine's oil volume information is higher than, lower than, or equal to the critical oil volume. When the engine's oil volume is lower than or equal to the critical oil volume, the engine needs to be topped up with oil; when the engine's oil volume is higher than the critical oil volume, the engine does not need to be topped up with oil temporarily. In the oil quantity temperature rise model, when a certain oil quantity is defined as multiple oil quantity values, the oil temperature changes differently over time at each oil quantity value. By using the actual temperature rise curve and the oil quantity temperature rise model, it can be determined that the engine oil quantity information is close to a certain oil quantity value, thus obtaining a more accurate engine oil quantity value. Of course, it is also possible to determine the relationship between the oil quantity value and the critical oil quantity based on this oil quantity value, so as to add oil or temporarily not add oil.

[0088] Step S100 specifically includes:

[0089] Step S110: In response to the detection command, acquire the initial state information of the engine and the oil temperature rise model; wherein, the initial state information includes: the initial coolant temperature and the initial oil temperature of the engine.

[0090] Step S120: When the initial state information meets the oil quantity detection conditions, control the engine to work under the operating conditions and acquire the oil temperature data of the engine during the warm-up process; wherein, the oil quantity detection conditions include: the initial coolant temperature is less than or equal to the first preset coolant temperature, and the initial oil temperature is less than or equal to the first preset oil temperature.

[0091] Specifically, the detection command refers to the command to start detecting the engine's oil level. Initial state information refers to the engine's state at the start of the detection. Oil level detection conditions refer to the suitable conditions for detecting the engine's oil level. If the initial state information meets the oil level detection conditions, further operation can proceed to detect the oil level; if the initial state information does not meet the oil level detection conditions, the detection is terminated, and a prompt message indicating that the detection conditions are not met is sent to the customer. Initial coolant temperature refers to the temperature of the engine's coolant at the start of the detection. The engine is equipped with coolant, which is a liquid that lowers the engine's temperature; for example, coolant can be water, antifreeze, glycerin, etc. Initial oil temperature refers to the temperature of the engine oil at the start of the detection. The first preset coolant temperature refers to a pre-set temperature for the coolant, and the first preset oil temperature refers to a pre-set temperature for the engine oil. When the initial coolant temperature is less than or equal to the first preset coolant temperature, and the initial oil temperature is less than or equal to the first preset oil temperature, the initial state information meets the oil level detection conditions, and the engine oil temperature data during the warm-up process is acquired. The first preset coolant temperature and the first preset oil temperature can be the same or different, depending on the highest air temperature in the engine's geographical area. Both the first preset coolant temperature and the first preset oil temperature must be greater than or equal to that highest air temperature. For example, the first preset coolant temperature is 50°C, and the first preset oil temperature is also 50°C. When acquiring oil temperature data during the engine's warm-up process, it is necessary to acquire oil temperature data at different time points multiple times.

[0092] The detection command can be triggered by the user or automatically by the engine. For example, the user can issue a detection command by pressing or touching a control key (e.g., a control key on the vehicle's infotainment panel); or the engine can issue a detection command automatically when it starts. The engine can also issue a detection command automatically after a certain period of use.

[0093] The detection instructions include: user detection instructions; the initial state information also includes: vehicle speed, vehicle gear, engine radiator opening / closing status, and fuel level detection conditions also include: vehicle speed is 0, gear is parking or neutral, and engine radiator is closed.

[0094] User-triggered detection commands refer to detection commands initiated by the user. When a user needs to check the engine fuel level, they actively trigger the command. Initial state information includes: vehicle speed, vehicle gear, and the open / closed state of the engine radiator. Fuel level detection conditions also include: vehicle speed of 0, gear in Park or Neutral, and engine radiator in a closed state. At 0 speed, the vehicle is stationary and not moving; a Park (P) or Neutral (N) gear further indicates that the vehicle is stationary and not moving, and the engine is not under load. The engine radiator is a device that dissipates heat from the engine, including: fan, thermostat, HVAC valve, grille (including smart grille), etc. When the engine radiator is closed, it does not cause temperature fluctuations in the engine, minimizing external influences on the engine's warm-up process.

[0095] Operating conditions include: predetermined operating conditions; Step S120 specifically includes:

[0096] Step S121: When the initial state information meets the oil quantity detection conditions, control the engine to work under the predetermined operating conditions and acquire the oil temperature data of the engine during the warm-up process.

[0097] Specifically, when the initial gear state information meets the fuel level detection conditions, the engine is controlled to operate under predetermined conditions, and fuel temperature data during the engine warm-up process is acquired. When the engine starts and operates under predetermined conditions, the vehicle will not move because the gear is in park or neutral. The engine enters the warm-up process, and the engine oil and coolant temperatures gradually rise, allowing fuel temperature data to be acquired. In response to a user's detection command, the user actively triggers fuel level detection, which allows the engine to operate under predetermined conditions and fuel temperature data during the warm-up process to be acquired. In other words, the operating conditions are limited to predetermined conditions, which simplifies variables and makes fuel level detection more accurate.

[0098] In response to a user's detection command, the system acquires the engine's initial state information (which may include initial coolant temperature, initial oil temperature, vehicle speed, vehicle gear position, and the opening / closing status of the engine radiator) and an oil temperature rise model. If the initial state information meets the oil level detection conditions, the system starts the engine and operates according to predetermined conditions to acquire engine oil temperature data. If the initial state information does not meet the oil level detection conditions, the system exits the detection process and sends a notification message indicating that the detection conditions are not met to inform the user.

[0099] The detection command also includes: engine start command; the engine warm-up process is that the coolant temperature rises from the initial coolant temperature to the second preset coolant temperature, or the oil temperature rises from the initial oil temperature to the second preset oil temperature; wherein, the second preset coolant temperature is greater than the first preset coolant temperature, and the second preset oil temperature is greater than the first preset oil temperature.

[0100] The engine start command is a detection command automatically triggered when the engine starts. After the engine starts, it acquires initial state information (which may include initial coolant temperature and initial oil temperature). If the initial state information meets the oil level detection conditions, it acquires the engine oil temperature data. If the initial state information does not meet the oil level detection conditions, the detection is terminated, and a message indicating that the detection conditions are not met is sent to the customer. Since the engine may not be operating under predetermined conditions, the vehicle may be in motion, the gear may not be in park or neutral, and the engine radiator may not be closed. Therefore, the initial state information may not necessarily include vehicle speed, gear position, or the radiator's open / closed state. The second preset coolant temperature and second preset oil temperature are determined as needed. Typically, the second preset coolant temperature is less than 100°C, and the second preset oil temperature is less than 120°C. For example, the second preset coolant temperature is 70°C, and the second preset oil temperature is 70°C.

[0101] The oil quantity temperature rise model includes: the calibrated temperature rise curve of the engine under operating conditions and critical oil quantity; the engine oil quantity information includes: the engine oil quantity is equal to or lower than the critical oil quantity; step S300 specifically includes:

[0102] Step S310: When the slope of the actual temperature rise curve is greater than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the engine oil quantity is lower than the critical oil quantity.

[0103] Step S320: When the slope of the actual temperature rise curve is equal to the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is equal to the critical oil quantity.

[0104] The engine fuel level information also includes: the engine fuel level is higher than the critical fuel level, and step S300 further includes:

[0105] Step S330: When the slope of the actual temperature rise curve is less than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is higher than the critical oil quantity.

[0106] Specifically, the critical oil quantity refers to the oil quantity close to the minimum oil quantity required for normal engine operation. When the engine oil quantity is at the minimum, the engine operates normally. If the oil quantity is below the minimum, the engine may experience significant wear or malfunction. The critical oil quantity is slightly higher than the minimum. To avoid affecting normal engine operation, the oil quantity should be above the minimum, meaning the oil quantity is greater than the minimum. When the oil quantity decreases to the critical oil quantity—that is, when the oil quantity is close to and about to reach the minimum—oil needs to be added. Alternatively, the minimum oil quantity required for normal engine operation can be used as the critical oil quantity. The engine oil quantity temperature rise model includes several calibrated temperature rise curves. Each calibrated temperature rise curve is obtained through testing and calibration under different conditions. For example, the calibrated temperature rise curves under the operating conditions and critical oil quantity are obtained when the engine oil quantity is at the critical oil quantity and operates according to predetermined operating conditions. The calibrated temperature rise profile of the engine under operating conditions and at the critical fuel quantity is used to determine whether the engine's fuel quantity is equal to, below, or above the critical fuel quantity. Specifically, by comparing the slope of the actual temperature rise profile with the slope of the calibrated temperature rise profile, the relative magnitude of the engine's fuel quantity to the critical fuel quantity can be determined. If the slope of the actual temperature rise profile is greater than the slope of the calibrated temperature rise profile, it indicates that the temperature rise of the actual temperature rise profile is faster, and the engine's fuel quantity is below the critical fuel quantity. If the slope of the actual temperature rise profile is equal to the slope of the calibrated temperature rise profile, it indicates that the temperature rise of the actual temperature rise profile is consistent with the temperature rise of the calibrated temperature rise profile, and the engine's fuel quantity is equal to the critical fuel quantity. If the slope of the actual temperature rise profile is less than the slope of the calibrated temperature rise profile, it indicates that the temperature rise of the actual temperature rise profile is slower, and the engine's fuel quantity is above the critical fuel quantity.

[0107] The oil quantity temperature rise model also includes: the calibrated temperature rise curve of the engine under operating conditions and non-critical oil quantity; the engine oil quantity information also includes: the engine oil quantity value; step S300 specifically includes:

[0108] Step S340: Based on the oil quantity heating model, determine the calibration heating curve under the operating conditions corresponding to the actual heating curve, and take the non-critical oil quantity corresponding to the calibration heating curve as the oil quantity value of the engine.

[0109] Specifically, noncritical oil quantity refers to oil quantity other than the critical oil quantity. Calibrating the temperature rise curve under the critical oil quantity only determines whether the engine's oil quantity is higher, equal to, or lower than the critical oil quantity, but it cannot determine the specific oil quantity value. When the engine's oil quantity is noncritical and it operates according to the specified operating conditions, a calibration temperature rise curve under both operating conditions and noncritical oil quantity is obtained. The oil quantity temperature rise model includes: when the engine is operating under noncritical oil quantity conditions, the calibration temperature rise curve corresponding to the actual temperature rise curve can be determined based on the engine's oil quantity temperature rise model (the operating conditions of the actual temperature rise curve are the same as those of the calibration temperature rise curve, and the slope of the actual temperature rise curve is the same as the slope of the calibration temperature rise curve). The noncritical oil temperature corresponding to the calibration temperature rise curve is then used as the engine's oil quantity value, thus obtaining a more specific oil quantity value. The noncritical oil quantity can be higher or lower than the critical oil quantity, but it is usually higher than the critical oil quantity.

[0110] The oil quantity detection method of this application also includes:

[0111] Step S410: When the engine fuel level is equal to or lower than the critical fuel level, a fuel level warning message is issued.

[0112] Specifically, after step S310 or S320, it can be determined that the engine oil level is below the critical oil level, or the engine oil level is equal to the critical oil level. When the engine oil level is equal to the critical oil level, or the engine oil level is below the critical oil level, an oil level warning message is issued, prompting the user to add engine oil to bring the engine oil level above the critical oil level and prevent engine damage. After step S330, it can be determined that the engine oil level is above the critical oil level. When the engine oil level is above the critical oil level, no oil level warning message needs to be issued.

[0113] The oil quantity detection method of this application also includes:

[0114] Step S420: Issue the engine fuel level value.

[0115] Specifically, after obtaining the engine oil level value in step S340, the engine oil level value can be sent to the user. Of course, when the engine oil level value equals the critical oil level, or when the engine oil level value is lower than the critical oil level, a further oil level warning message can be sent, prompting the user to add engine oil to raise the engine oil level above the critical oil level and prevent engine damage. When the engine oil level value is higher than the critical oil level, no further oil level warning message is needed.

[0116] like Figure 2 As shown, before step S100, the engine oil level detection method further includes:

[0117] Step S11: For each operating condition of the engine, calculate the theoretical temperature rise curve corresponding to each test oil quantity based on the heat generated by the engine. The operating conditions include at least one of the predetermined operating conditions and the non-predetermined operating conditions, and the test oil quantities include at least one of the critical oil quantities and the non-critical oil quantities.

[0118] Step S12: Configure the engine oil level to the test oil level, control the engine to operate under the corresponding operating conditions, and obtain the engine oil temperature test data.

[0119] Step S13: Based on the engine oil temperature test data, obtain the test temperature rise curve corresponding to the test oil volume of the engine.

[0120] Step S14: Correct the theoretical temperature rise curve based on the test temperature rise curve to obtain the calibrated temperature rise curve of the engine under operating conditions and test oil quantity, so as to form an oil quantity temperature rise model.

[0121] Specifically, the engine oil temperature rise model is obtained through steps S11-S14. This model contains several calibration temperature rise curves. The accuracy of these calibration curves depends on the engine's operating conditions, oil quantity, and actual usage scenarios. Therefore, theoretical temperature rise curves are established for different operating conditions and oil quantities. These curves are then combined with test temperature rise curves to correct the theoretical curves, resulting in the calibration temperature rise curves. The theoretical temperature rise curve refers to the temperature rise curve calculated theoretically, while the test temperature rise curve refers to the temperature rise curve obtained through engine testing.

[0122] According to the thermodynamic theorem, Q = CM·ΔT, where Q represents the engine's heat output, C represents the oil's specific heat capacity, M represents the oil's mass, and ΔT represents the oil's temperature change. The engine's heat output varies under different operating conditions, thus affecting the oil's temperature change. The oil's temperature change also varies with different oil quantities. As the engine is used and accumulates mileage, the oil may deteriorate, altering its specific heat capacity, which in turn affects the oil's temperature change. Since specific heat capacity changes over a relatively long period, the specific heat capacity is kept constant when calculating the theoretical and measured temperature rise curves. By adjusting the operating conditions and oil quantity, theoretical and measured temperature rise curves for different oil quantities under different operating conditions are obtained. Then, for each operating condition and oil quantity, the theoretical temperature rise curve is corrected based on the measured temperature rise curve to obtain the calibrated temperature rise curve.

[0123] The engines include engines with different operating mileages. The engine oil temperature test data includes oil temperature test data for engines with different operating mileages. The calibrated temperature rise curves of the engines under operating conditions and test oil volume include calibrated temperature rise curves of engines with different operating mileages under operating conditions and test oil volume.

[0124] Specifically, considering that long-term use of engine oil leads to deterioration and changes in specific heat capacity, the engine can include engines with different operating mileages. The oil temperature test data is classified according to different operating mileages (for example, the operating mileage can be 500km, 1000km, 1500km, ..., 10000km) to obtain oil temperature test data for engines with different operating mileages. This yields the test temperature rise curves for engines with different operating mileages under operating conditions and test oil volumes. The theoretical temperature rise curve is corrected using the test temperature rise curves for different operating mileages to obtain the calibration temperature rise curves for engines with different operating mileages under operating conditions and test oil volumes. The calibration temperature rise curves can then be divided into three different calibration temperature rise curves in three dimensions: different operating mileages, different operating conditions, and different test oil volumes.

[0125] The calibration temperature rise profiles of the engine under operating conditions and critical fuel quantity include: the calibration temperature rise profiles of the engine under predetermined operating conditions and critical fuel quantity; such as... Figure 3 As shown, before step S100, the engine oil level detection method further includes:

[0126] Step S21: Calculate the theoretical temperature rise curve corresponding to the critical oil quantity of the engine based on the heat generated by the engine under predetermined operating conditions.

[0127] Step S22: Obtain the actual oil temperature data corresponding to the critical oil quantity when the engine of different vehicles is working under predetermined operating conditions.

[0128] Step S23: Correct the theoretical temperature rise curve corresponding to the critical oil quantity of the engine based on the actual oil temperature data to obtain the calibrated temperature rise curve of the engine under the predetermined operating conditions and critical oil quantity, so as to form an oil quantity temperature rise model.

[0129] Specifically, the calibrated temperature rise curve of the engine under predetermined operating conditions and critical fuel quantity is obtained through steps S21-S23. The engine temperature rise curve under predetermined operating conditions and critical fuel quantity can be obtained through steps S11-S14, and can also be obtained in different ways. Unlike steps S11-S14, actual oil temperature data corresponding to the critical fuel quantity under predetermined operating conditions is collected from the engines of different vehicles (specifically, actual oil temperature data from different vehicles can be collected via the cloud), and this data is used to correct the theoretical temperature rise curve, resulting in the calibrated temperature rise curve of the engine under predetermined operating conditions and critical fuel quantity. Since the predetermined operating conditions and critical fuel quantity are fixed, and corrected using actual oil temperature data, the obtained calibrated temperature rise curve of the engine under predetermined operating conditions and critical fuel quantity is very close to the actual application scenario, thus achieving higher accuracy. Of course, the calibrated temperature rise curve of the engine under operating conditions and critical fuel quantity can also include: the calibrated temperature rise curve of the engine under non-predetermined operating conditions and critical fuel quantity.

[0130] Considering the varying operating mileage of engines, the following data is provided: Actual oil temperature data corresponding to the critical oil quantity under predetermined operating conditions for engines of different vehicles and with different mileages. The calibrated temperature rise curves for engines under predetermined operating conditions and critical oil quantities are also provided. Furthermore, the calibrated temperature rise curves for engines under non-predetermined operating conditions and critical oil quantities are provided.

[0131] Based on the engine fuel quantity detection method of any of the above embodiments, embodiments of this application also provide an engine fuel quantity detection system, including:

[0132] The acquisition module is used to acquire the engine's oil volume temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process;

[0133] The temperature rise curve module is used to determine the actual temperature rise curve of the engine based on oil temperature data;

[0134] The fuel quantity module is used to determine the engine's fuel quantity information based on the fuel quantity temperature rise model, the actual temperature rise curve, and operating conditions.

[0135] Based on the engine fuel quantity detection method of any of the above embodiments, embodiments of this application also provide an in-vehicle terminal. The in-vehicle terminal may include:

[0136] Memory, processor, and computer programs stored in memory and capable of running on the processor.

[0137] When the processor executes the program, it implements the engine oil level detection method provided in the above embodiments.

[0138] Furthermore, the vehicle-mounted terminal also includes:

[0139] A communication interface used for communication between the memory and the processor.

[0140] The memory may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage device.

[0141] If the memory, processor, and communication interface are implemented independently, they can be interconnected via a bus to communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc.

[0142] Specifically, if the memory, processor, and communication interface are integrated on a single chip, then the memory, processor, and communication interface can communicate with each other through internal interfaces.

[0143] The processor may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of this application.

[0144] Furthermore, based on the engine oil level detection system of any of the above embodiments or the vehicle-mounted terminal of any of the above embodiments, embodiments of this application also propose a vehicle that includes the engine oil level detection system of the above embodiments or the vehicle-mounted terminal of the above embodiments.

[0145] In the description of this specification, the references to terms such as "embodiment," "any embodiment," or "implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or implementations. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or implementations described in this specification, as well as the features of different embodiments or implementations.

[0146] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0147] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0148] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

Claims

1. A method for detecting the oil level in an engine, characterized in that, Includes the following steps: Acquire the engine's oil temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process; Based on the oil temperature data, determine the actual temperature rise curve of the engine; Based on the oil quantity temperature rise model, the oil quantity information of the engine is determined according to the actual temperature rise curve and the operating conditions. The oil quantity temperature rise model includes: the calibrated temperature rise curve of the engine under operating conditions and critical oil quantity; the oil quantity information of the engine includes: the oil quantity of the engine is equal to or lower than the critical oil quantity. The determination of the engine's fuel quantity information based on the fuel quantity temperature rise model, the actual temperature rise curve, and the operating conditions includes: When the slope of the actual temperature rise curve is greater than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is lower than the critical oil quantity. When the slope of the actual temperature rise curve is equal to the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is equal to the critical oil quantity.

2. The method for detecting engine oil quantity according to claim 1, characterized in that, The engine fuel quantity information also includes: the engine fuel quantity is higher than the critical fuel quantity; the determination of the engine fuel quantity information based on the fuel quantity temperature rise model, according to the actual temperature rise curve and the operating conditions, further includes: When the slope of the actual temperature rise curve is less than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the oil quantity of the engine is higher than the critical oil quantity.

3. The method for detecting engine oil quantity according to claim 1, characterized in that, The engine oil level detection method further includes the following steps: When the engine's fuel level is equal to or lower than the critical fuel level, a fuel level warning message is issued.

4. The method for detecting engine oil quantity according to claim 1, characterized in that, The oil quantity temperature rise model also includes: the calibration temperature rise curve of the engine under operating conditions and non-critical oil quantity; the engine oil quantity information also includes: the engine oil quantity value; The determination of the engine's fuel quantity information based on the fuel quantity temperature rise model, the actual temperature rise curve, and the operating conditions includes: Based on the oil quantity temperature rise model, the calibration temperature rise curve under the corresponding operating conditions is determined according to the actual temperature rise curve, and the non-critical oil quantity corresponding to the calibration temperature rise curve is taken as the oil quantity value of the engine.

5. The method for detecting engine oil quantity according to claim 1, characterized in that, The acquisition of the engine oil temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process, includes: In response to a detection command, the engine's initial state information and oil temperature rise model are acquired; wherein, the initial state information includes: the engine's initial coolant temperature and initial oil temperature; When the initial state information meets the oil quantity detection conditions, the engine is controlled to operate under the operating conditions, and the oil temperature data of the engine during the warm-up process is acquired; wherein, the oil quantity detection conditions include: the initial coolant temperature is less than or equal to the first preset coolant temperature, and the initial oil temperature is less than or equal to the first preset oil temperature.

6. The method for detecting engine oil quantity according to claim 5, characterized in that, The detection command includes: user detection command; the initial state information also includes: at least one of the following: vehicle speed, vehicle gear, and engine radiator opening / closing state; the fuel level detection conditions also include: vehicle speed is 0, gear is parking or neutral, and engine radiator is closed.

7. The method for detecting engine oil quantity according to claim 5, characterized in that, The detection command also includes: an engine start command; the engine warm-up process is that the coolant temperature rises from the initial coolant temperature to the second preset coolant temperature, or the oil temperature rises from the initial oil temperature to the second preset oil temperature; wherein, the second preset coolant temperature is greater than the first preset coolant temperature, and the second preset oil temperature is greater than the first preset oil temperature.

8. The method for detecting engine oil quantity according to claim 5, characterized in that, The first preset coolant temperature and the first preset oil temperature are both determined based on the highest air temperature in the geographical area where the engine is located.

9. The method for detecting the oil level in an engine according to any one of claims 1-8, characterized in that, The oil temperature rise model is obtained through the following steps: For each operating condition of the engine, the theoretical temperature rise curve corresponding to each test oil quantity is calculated based on the heat generated by the engine. The operating conditions include at least one of a predetermined operating condition and an unpredictable operating condition, and the test oil quantity includes at least one of a critical oil quantity and an uncritical oil quantity. Configure the engine's oil level as the test oil level, control the engine to operate under corresponding operating conditions, and acquire the engine's oil temperature test data; Based on the engine oil temperature test data, the test temperature rise curve corresponding to the test oil volume of the engine is obtained; The theoretical temperature rise curve is corrected based on the test temperature rise curve to obtain the calibrated temperature rise curve of the engine under operating conditions and test oil quantity, so as to form an oil quantity temperature rise model.

10. The method for detecting the oil level in an engine according to claim 9, characterized in that, The engine includes engines with different operating mileages, the oil temperature test data of the engine includes oil temperature test data of engines with different operating mileages, and the calibration temperature rise curve of the engine under operating conditions and test oil volume includes calibration temperature rise curves of engines with different operating mileages under operating conditions and test oil volume.

11. The method for detecting the oil level in an engine according to any one of claims 1-8, characterized in that, The calibrated temperature rise curves of the engine under operating conditions and critical fuel quantity include: calibrated temperature rise curves of the engine under predetermined operating conditions and critical fuel quantity; the fuel quantity temperature rise model is obtained through the following steps: Based on the heat generated by the engine under predetermined operating conditions, calculate the theoretical temperature rise curve corresponding to the critical oil quantity of the engine. Obtain the actual oil temperature data corresponding to the critical oil quantity when the engine of different vehicles is working under predetermined operating conditions; Based on the actual oil temperature data, the theoretical temperature rise curve corresponding to the critical oil quantity of the engine is corrected to obtain the calibrated temperature rise curve of the engine under predetermined operating conditions and critical oil quantity, so as to form an oil quantity temperature rise model.

12. The method for detecting the oil level in an engine according to claim 11, characterized in that, The actual oil temperature data corresponding to the critical oil quantity when the engines of different vehicles are operating under predetermined conditions includes: the actual oil temperature data corresponding to the critical oil quantity when the engines of different vehicles and different mileages are operating under predetermined conditions. The calibration temperature rise curve of the engine under predetermined conditions and critical oil quantity includes: the calibration temperature rise curve of the engine under predetermined conditions and critical oil quantity for different vehicles and different mileages.

13. An engine oil level detection system, characterized in that, include: The acquisition module is used to acquire the engine's oil volume temperature rise model, as well as the oil temperature data and operating conditions during the temperature rise process; The temperature rise curve module is used to determine the actual temperature rise curve of the engine based on the oil temperature data; The fuel quantity module is used to determine the fuel quantity information of the engine based on the fuel quantity temperature rise model, the actual temperature rise curve, and the operating conditions. The oil quantity temperature rise model includes: the calibrated temperature rise curve of the engine under operating conditions and critical oil quantity; the engine oil quantity information includes: the engine oil quantity is equal to or lower than the critical oil quantity; the oil quantity module is specifically used to determine that when the slope of the actual temperature rise curve is greater than the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the engine oil quantity is lower than the critical oil quantity; when the slope of the actual temperature rise curve is equal to the slope of the calibrated temperature rise curve under the corresponding operating conditions and critical oil quantity, the engine oil quantity is equal to the critical oil quantity.

14. A vehicle-mounted terminal, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the fuel quantity detection method for an engine as described in any one of claims 1-12.

15. A vehicle, characterized in that, include: The engine oil level detection system as described in claim 13, or the vehicle terminal as described in claim 14.

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