A vehicle intelligent oil change system and method

Abstract

The present invention discloses an intelligent vehicle oil change system, comprising: two fuel tanks, including a first fuel tank and a second fuel tank arranged at intervals; two liquid level sensors respectively arranged in the two fuel tanks; a commutation system arranged between the engine and the two fuel tanks, including a two-position three-way valve, whose input end is communicated with the fuel supply pipe of the engine, and the two output ends of the two-position three-way valve are respectively communicated with the first fuel tank and the second fuel tank through a suction pipe and a guide pipe; a driving mechanism arranged to adjust the spool position of the two-position three-way valve; a return pipe communicating the first fuel tank and the oil return hole of the engine; and a controller electrically connected to the two liquid level sensors and the driving mechanism. The present invention detects the real-time oil level through the liquid level sensor, and cooperates with the controller to realize the full-automatic cyclic switching of the working mode of the commutation system, which improves the automation level of oil change while ensuring the switching accuracy and switching efficiency, and effectively saves costs.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle engineering. More specifically, the present invention relates to a vehicle intelligent oil changing system and method. Background Art

[0002] Traditional commercial vehicles are in long-distance working conditions for a long time and have a high demand for fuel. Therefore, two fuel tanks, one large and one small, are standardly equipped before the vehicle leaves the factory. When the fuel in one fuel tank is about to run out, the supply of the engine can be switched to the other fuel tank by changing the relevant configurations of valves and oil pipes, so as to ensure fuel consumption. Conventional switching methods require adding a variety of three-way valves, switching valves and complex pipelines on the chassis, resulting in an increase in design and production costs; and some vehicles still use manual switching methods, which are complex and cumbersome to operate, the switching standards are not reasonable enough, it is easy to cause fuel waste, and there are problems such as inability to refuel in time or too high refueling frequency.

[0003] To solve the above problems, it is necessary to design a vehicle intelligent oil changing system and method to save costs while improving the automation level of oil changing. Summary of the Invention

[0004] The purpose of the present invention is to provide a vehicle intelligent oil changing system and method, which detects the real-time oil level height through a liquid level sensor, and cooperates with a controller to realize the full-automatic cyclic switching of the working mode of the commutation system, ensuring the switching accuracy and efficiency while improving the automation level of oil changing, and effectively saving costs.

[0005] To achieve these and other advantages in accordance with the present invention, there is provided a vehicle intelligent oil changing system, comprising:

[0006] Two fuel tanks, including a first fuel tank and a second fuel tank arranged at intervals;

[0007] Two liquid level sensors, which are respectively arranged in the two fuel tanks, and any one liquid level sensor is configured to detect the liquid level height in the corresponding fuel tank;

[0008] A commutation system, which is arranged between the engine and the two fuel tanks. The commutation system includes a two-way three-way valve, whose input end is connected to the fuel supply pipe of the engine, and the two output ends of the two-way three-way valve are respectively connected to the first fuel tank and the second fuel tank through a suction pipe and a guide pipe; a driving mechanism, which is configured to adjust the position of the spool of the two-way three-way valve;

[0009] A return pipe, which connects the first fuel tank and the oil return hole of the engine;

[0010] A controller, which is electrically connected to the two liquid level sensors and the driving mechanism;

[0011] Wherein, in the first working mode, the driving mechanism drives the spool of the two-way three-way valve to move to block the output end passage corresponding to the oil guide pipe, and the fuel supply pipe supplies oil through the first fuel tank; in the second working mode, the driving mechanism drives the spool of the two-way three-way valve to move to block the output end passage corresponding to the oil suction pipe, and the fuel supply pipe supplies oil through the second fuel tank.

[0012] Preferably, for the vehicle intelligent oil change system, the controller includes an oil quantity detection module that collects real-time liquid level height data of the two liquid level sensors; a control module that receives the real-time liquid level height data from the oil quantity detection module and switches the working mode of the commutation system according to a set switching threshold; and an early warning module that receives the real-time liquid level height data from the oil quantity detection module and gives an oil quantity early warning according to a set early warning value.

[0013] Preferably, for the vehicle intelligent oil change system, the controller further includes a self-check module that is used to calibrate the working state of the driving mechanism when the vehicle is powered on; a liquid level difference detection module that is used to detect the liquid level difference in the fuel tank from when the vehicle is turned off to the next time it is powered on, and sends fault data to the early warning module when the detected liquid level difference exceeds the set value.

[0014] Preferably, for the vehicle intelligent oil change system, the controller further includes a self-locking excitation module that is used to give a boosting excitation to the driving mechanism in the expected direction after it switches its working state according to the set working mode.

[0015] Preferably, for the vehicle intelligent oil change system, the controller further includes a filtering module that receives the real-time liquid level height data from the oil quantity detection module, filters it, and then transmits it to the control module and the early warning module.

[0016] The present invention also provides a vehicle intelligent oil change method, including:

[0017] S1. Set two switching thresholds, including a first switching threshold and a second switching threshold, and the first switching threshold is greater than the second switching threshold;

[0018] S2. Set that both fuel tanks are full in the initial state, power on the vehicle, set the control module to the first working mode, the fuel supply pipe supplies oil to the engine through the first fuel tank, and the engine returns oil to the first fuel tank through the return oil pipe;

[0019] S3. During vehicle driving, the control module reads and compares real-time liquid level data in the two fuel tanks. When the percentage of the liquid level in the first fuel tank to the total height of the first fuel tank is less than the second switching threshold and the percentage of the liquid level in the second fuel tank to the total height of the second fuel tank is greater than the first threshold, the control module switches to the second operating mode, and the fuel supply pipe supplies fuel to the engine through the second fuel tank.

[0020] S4, the control module continuously compares the real-time liquid level data in the two fuel tanks, and when the percentage of the liquid level in the first fuel tank to the total height of the first fuel tank is greater than or equal to the first switching threshold or the percentage of the liquid level in the second fuel tank to the total height of the second fuel tank is less than or equal to the second switching threshold, the control module switches back to the first operating mode;

[0021] S5. Repeat steps S3-S4, and the control module automatically switches the working mode in a cycle according to the real-time liquid level height data in the two fuel tanks; wherein, when the percentage of the liquid level height in the two fuel tanks to the total height of the corresponding fuel tanks is less than the second switching threshold, the oil level warning signal is sent through the warning module.

[0022] Preferably, in the vehicle intelligent oil change method, when the vehicle is powered on again after being shut down, the controller reads the working mode data recorded before the vehicle is shut down through the self-test module, and compares the working state of the drive mechanism under the working mode with the working state of the drive mechanism detected after power-on. When the two are inconsistent, the working state of the drive mechanism is calibrated based on the working state of the drive mechanism under the recorded working mode.

[0023] Preferably, in the vehicle intelligent oil change method, when the vehicle is powered on again after being shut down, the controller reads the liquid level height data of the two liquid level sensors recorded before being shut down through the liquid level difference detection module, and calculates the difference between the liquid level height data and the real-time liquid level height data detected after power-on. When the difference of the same liquid level sensor is greater than the set value, a fault signal is sent through the early warning module.

[0024] Preferably, in the vehicle intelligent oil changing method, when the control module sets or switches the working mode, the self-locking excitation module reads the working state of the driving mechanism under the new working mode and applies an excitation source in the same direction to the driving mechanism after the working state conversion is completed.

[0025] The present invention has at least the following beneficial effects:

[0026] 1. The present invention detects the real-time height of the oil by a liquid level sensor, and cooperates with a controller to achieve the full-automatic cyclic switching of the working mode of the reversing system. When supplying oil, it relies on the oil pump of the engine itself to drive the oil supply. The system has a simple structure, does not require adding too many components, is convenient for installation and maintenance, has a high matching degree with the dual-tank oil supply system, ensures the switching accuracy and efficiency while improving the automation level of oil change, and optimizes the design layout of the oil supply system, effectively saving costs. It can be widely applied to the chassis system design of various vehicles and has a wide range of applications.

[0027] 2. The controller of the present invention is also equipped with functional modules such as a self-check module, a liquid level difference detection module, a self-locking excitation module, and a filtering module, which further ensure the stability of the vehicle intelligent oil change system during operation. Cooperating with the warning system, it can report the corresponding fault data in time after detecting system problems, improving the durability of the oil change system and the safety of the whole vehicle.

[0028] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of a vehicle intelligent oil change system in the first working mode according to an embodiment of the present invention;

[0030] Figure 2 It is a schematic structural diagram of the vehicle intelligent oil change system in the second working mode described in the above embodiment.

[0031] Description of the reference numerals:

[0032] 11. First fuel tank; 12. Second fuel tank; 21. First liquid level sensor; 22. Second liquid level sensor; 31. Two-position three-way valve; 32. Driving mechanism; 41. Oil supply pipe; 42. Suction pipe; 43. Guide pipe; 44. Return pipe; 5. Engine; 6. Controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following further describes the present invention in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0034] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation schemes are all conventional methods, and the reagents and materials, unless otherwise specified, can all be obtained from commercial channels; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0035] As Figure 1-2 shown, the present invention provides a vehicle intelligent oil change system, comprising:

[0036] Two fuel tanks, which include a first fuel tank and a second fuel tank arranged at intervals;

[0037] Two liquid level sensors, which are respectively arranged in the two fuel tanks, and any one of the liquid level sensors is arranged to detect the liquid level height in the corresponding fuel tank;

[0038] A commutation system, which is arranged between the engine and the two fuel tanks, the commutation system includes a two-position three-way valve, its input end is connected to the fuel supply pipe of the engine, and the two output ends of the two-position three-way valve are respectively connected to the first fuel tank and the second fuel tank through an oil suction pipe and an oil guide pipe; a driving mechanism, which is arranged to adjust the valve core position of the two-position three-way valve;

[0039] An oil return pipe, which connects the first fuel tank and the oil return hole of the engine;

[0040] A controller, which is electrically connected to the two liquid level sensors and the driving mechanism;

[0041] Wherein, in the first working mode, the driving mechanism drives the valve core of the two-position three-way valve to move to block the output end passage corresponding to the oil guide pipe, and the fuel supply pipe supplies oil through the first fuel tank; in the second working mode, the driving mechanism drives the valve core of the two-position three-way valve to move to block the output end passage corresponding to the oil suction pipe, and the fuel supply pipe supplies oil through the second fuel tank.

[0042] In the above technical solution, two liquid level sensors are set as the first liquid level sensor and the second liquid level sensor, which are respectively installed in the first fuel tank and the second fuel tank. The liquid level sensor can measure the liquid level height of the fuel in the corresponding fuel tank and transmit the liquid level data to the controller through an electrical signal for analysis and processing. Thus, the controller can adjust the working mode of the commutation system according to the real-time liquid level heights in the two fuel tanks under the set rules, realizing the automatic and intelligent switching of the fuel supply tank, and can accurately guide the timing of the system oil circuit switching, avoiding problems of the fuel supply system caused by frequent or untimely oil circuit switching, which affects the normal operation of the whole vehicle. Specifically, the valve core of the two-way three-way valve has two moving end positions (position a and position b) inside the valve. The driving mechanism is used to drive the valve core to move between position a and position b. When the valve core moves to position a, the output end passage of the corresponding two-way three-way valve of the guide oil pipe is blocked, and the fuel cannot be supplied to the engine through the guide oil pipe, and can only supply oil to the engine through the passage of the suction pipe - supply pipe; when the valve core moves to position b, the output end passage of the corresponding two-way three-way valve of the suction pipe is blocked, and the fuel cannot be supplied to the engine through the suction pipe, and can only supply oil to the engine through the passage of the guide oil pipe - supply pipe. Thus, by changing the working state (the movement position of the valve core) of the driving mechanism, the fuel supply switching between the first fuel tank and the second fuel tank can be realized, thereby changing the oil circuit direction. Correspondingly, the commutation system has two working modes. In the first working mode, the controller controls the driving mechanism to drive the valve core to move to position a, and at this time the engine is supplied with fuel only through the first fuel tank (suction pipe); in the second working mode, the controller controls the driving mechanism to drive the valve core to move to position b, and at this time the engine is supplied with fuel only through the second fuel tank (guide oil pipe). During the above working process, the remaining fuel that the engine has not used up always returns to the first fuel tank through the return pipe for recycling, that is, whether the fuel in the first fuel tank or the second fuel tank is consumed, the return oil in the first fuel tank is increasing synchronously. The controller can automatically realize the cyclic switching of different oil circuits (working modes) according to the above changes under the same set rules. Thus, the oil circuit switching method is optimized, and the oil changing timing is all automatically and accurately judged by the control system, reducing the influence of the driver's subjective judgment and operation level on the oil changing work. Among them, components such as a coarse filter, a fine filter, a high-pressure oil pump, a high-pressure common rail, and an injector are also provided between the fuel supply pipe of the engine and the engine block (not shown in the attached drawing). After the fuel pumped out from the fuel tank enters the fuel supply pipe under the action of the high-pressure oil pump, it first passes through the coarse filter to filter out moisture, and then passes through the fine filter to remove particles and impurities, enters the high-pressure oil pump and is injected into the high-pressure common rail. The fuel in the high-pressure common rail quickly rises in pressure and temperature and enters the injector, and the injector sprays the atomized diesel into the engine block; the liquid level sensor can be a conventional hydrostatic liquid level sensor, and the system valve (two-way three-way valve) can be a solenoid valve or an electric valve, and the selection of the driving mechanism is adapted to the valve type.In this embodiment, the two-way three-way valve is an electric valve, and the driving mechanism is a supporting valve motor, which makes the durability and sealing performance of the commutation system better and ensures the stability of the oil circuit switching. In addition, the commutation system can be built into the first fuel tank (main fuel tank), the fuel supply pipe is driven by the engine's own oil pump to achieve oil supply on the pipeline, and the controller function can be integrated into the ECU or VCU according to the vehicle type. The system structure is simple, without additional components, streamlining the hardware and pipeline layout structure of the oil change system, leaving more space for the vehicle chassis layout and design, and effectively saving the design and production costs.

[0043] In another technical solution, for the vehicle intelligent oil change system, the controller includes an oil quantity detection module, which collects the real-time liquid level height data of the two liquid level sensors; a control module, which receives the real-time liquid level height data from the oil quantity detection module and switches the working mode of the commutation system according to the set switching threshold; and an early warning module, which receives the real-time liquid level height data from the oil quantity detection module and gives an oil quantity warning according to the set early warning value.

[0044] Among them, the control strategy of the control module is as follows: after the vehicle starts, it preferentially uses the fuel in the first fuel tank (i.e., adopts the first working mode), and obtains the liquid level heights of the fuel in the first fuel tank and the second fuel tank by reading the real-time liquid level height data of the oil quantity detection module (liquid level sensor). When the liquid level heights in the two fuel tanks meet the set switching threshold (the logical condition for oil circuit switching), the control module sends a control signal to the driving mechanism to drive the valve motor to change the fuel flow direction of the fuel supply pipeline, and switches the fuel use source of the vehicle to the second fuel tank (i.e., switches to the second working mode). Since there is also a return oil pipe in the first fuel tank, the fuel liquid level height in the first fuel tank will rise in the second working mode. The above oil circuit switching process can be cycled under the same set of oil circuit switching logic to achieve continuous and sufficient fuel supply to the engine. The oil circuit switching is automatically performed according to the liquid level height in the fuel tank, improving the automation and intelligence level of the oil change system. At the same time, after the vehicle is powered on, the early warning module periodically identifies the liquid level heights of the first fuel tank and the second fuel tank. When the liquid level heights in both the first fuel tank and the second fuel tank are lower than the set early warning value, the system timely issues an alarm signal to prompt the driver to refuel.

[0045] In another technical solution, for the vehicle intelligent oil change system, the controller further includes a self-check module, which is used to calibrate the working state of the driving mechanism when the vehicle is powered on; a liquid level difference detection module, which is used to detect the liquid level difference in the fuel tank from when the vehicle is turned off to the next power-on, and send fault data to the warning module when the detected liquid level difference exceeds the set value. In the above technical solution, the vehicle intelligent oil change system is powered by the vehicle IGN ON gear. After power-on, the controller realizes the self-check function of the working state of the driving mechanism (valve motor) through the self-check module. The self-check module identifies the current rotation position of the valve motor, and compares it with the rotation position (spool position) of the valve motor corresponding to the working mode of the commutation system selected by the control module. When the identified current valve motor position is incorrect (does not match the set working mode), the self-check module sends a signal to drive the valve motor to rotate to the correct position. The liquid level difference detection module can read the liquid level height data in the fuel tank before turning off and after re-powering on and calculate the difference. When the front and rear liquid level differences corresponding to any fuel tank exceed the set value, it can be considered that there are problems such as faults in the detection hardware (liquid level sensor or other components) or oil leakage, and it is necessary to report the fault data to the warning system to facilitate the driver to check the fault in time and avoid the vehicle continuing to drive under safety risks. The self-check module and the liquid level difference detection module are both used for safety inspections when the vehicle is re-powered on (before driving), which can further ensure the safety and stability of the oil change system during operation and avoid problems such as vehicle malfunctions and frequent repairs during driving.

[0046] In another technical solution, for the vehicle intelligent oil change system, the controller further includes a self-locking excitation module, which is used to apply a boosting excitation in the expected direction after the driving mechanism changes its working state according to the set working mode. In the above technical solution, the spool of the two-way three-way valve has two moving end positions, a and b. After setting the working mode, the control module controls the valve motor to rotate in the corresponding direction to drive the spool to move to the specified position (taking position a as an example). After the spool moves in place, to ensure the reliability of the valve motor self-locking, the self-locking excitation module can continuously apply an excitation to the valve motor in the same direction (i.e., the expected direction). Due to the limitation of the moving end of the spool and it cannot move further away from position b from position a, the valve motor will not continue to rotate, but there is a locking force in the same direction on the spool under the excitation, effectively avoiding the influence of factors such as vibration during vehicle driving on the spool position and ensuring the sealing of the fuel supply pipeline and the working stability of the fuel supply system. Specifically, in this embodiment, the self-locking excitation module realizes the self-locking of the valve motor after the working state is switched through the single-chip microcomputer-driven PWM pulse width modulation, and the boosting excitation in the same direction continues until the next working state (working mode) is switched.

[0047] In another technical solution, for the vehicle intelligent oil change system, the controller further includes a filtering module, which receives the real-time liquid level height data from the oil quantity detection module, filters the data, and then transmits it to the control module and the warning module. In the above technical solution, the liquid level height in the fuel tank measured by the liquid level sensor is the basis for the judgment of the functions of multiple modules in the controller. However, due to the influence of factors such as vibration during the operation of the whole vehicle, small-amplitude and high-frequency fluctuations will occur during the acquisition of the liquid level information, which will have a certain impact on the start and stop of the control strategy. Therefore, a filtering module is specifically integrated in the controller to remove the burrs and jitters of the liquid level signal, so that each functional module in the system (mainly the control module) can respond more accurately to the switching of the oil circuit. Among them, the filtering module can select the form of software filtering to implement the filtering process of the real-time liquid level height data through algorithms. The software filtering algorithm can be median filtering or first-order high-pass filtering, etc. Or a filter can be added to the system (such as setting a resistor-capacitor filtering circuit between the controller and the liquid level sensor), and the interference of external factors such as vibration can be reduced through hardware filtering to ensure the accuracy of the data collected by the oil quantity detection module.

[0048] The present invention also provides a vehicle intelligent oil change method, including:

[0049] S1. Set two switching thresholds, including a first switching threshold and a second switching threshold, where the first switching threshold is greater than the second switching threshold; among them, any switching threshold is set in the form of a percentage, and the switching threshold is greater than 0 and less than 100%;

[0050] S2. Set that both fuel tanks are full in the initial state, the vehicle is powered on, the control module is set to the first working mode, the fuel supply pipe supplies fuel to the engine through the first fuel tank, and the engine returns oil to the first fuel tank through the return oil pipe;

[0051] S3. During the driving of the vehicle, the control module reads and compares the real-time liquid level height data in the two fuel tanks. When the percentage of the liquid level height in the first fuel tank to the total height of the first fuel tank is less than the second switching threshold and the percentage of the liquid level height in the second fuel tank to the total height of the second fuel tank is greater than the first threshold, the control module switches to the second working mode, and the fuel supply pipe supplies fuel to the engine through the second fuel tank. At this time, the engine still returns oil to the first fuel tank through the return oil pipe;

[0052] S4. The control module continuously compares the real-time liquid level height data in the two fuel tanks. When the percentage of the liquid level height in the first fuel tank to the total height of the first fuel tank is greater than or equal to the first switching threshold, or the percentage of the liquid level height in the second fuel tank to the total height of the second fuel tank is less than or equal to the second switching threshold, the control module switches back to the first working mode.

[0053] S5. Repeat the steps of S3 - S4. The control module automatically and cyclically switches the working mode according to the real-time liquid level height data in the two fuel tanks. Wherein, when the percentages of the liquid level heights in the two fuel tanks to the total heights of the corresponding fuel tanks are both less than the second switching threshold, an oil quantity warning signal is sent through the warning module.

[0054] In this embodiment, the first switching threshold is selected as 90%, and the second switching threshold is selected as 10%. In the initial state, it is default that both fuel tanks are full (or the percentages of the oil quantities in the two fuel tanks to the total capacities of the fuel tanks are the same). In this case, the first fuel tank (main fuel tank) supplies oil preferentially. After the vehicle has traveled for a period of time, the liquid level in the first fuel tank gradually decreases, and the liquid level in the second fuel tank remains unchanged. When the control module detects that the remaining oil quantity in the first fuel tank (i.e., the percentage of the liquid level height in the first fuel tank to the total height of the first fuel tank) is less than 10% and the remaining oil quantity in the second fuel tank (the percentage of the liquid level height in the second fuel tank to the total height of the second fuel tank) is greater than 90%, the control module switches the commutation system to the second working mode, and at this time, the second fuel tank supplies oil. During the oil supply process of the second fuel tank, the return oil pipe continuously returns oil to the first fuel tank through the engine throttle return oil hole, that is, while the liquid level of the second fuel tank decreases, the liquid level of the first fuel tank rises. When the control module detects that the remaining oil quantity in the first fuel tank is greater than or equal to 90% or the remaining oil quantity in the second fuel tank is less than or equal to 10% (meeting any of the above conditions), the control module switches back to the first working mode, that is, the first fuel tank supplies oil. The capacities of the first fuel tank and the second fuel tank are selected according to the vehicle design parameters, and they can be the same or different. If the switching condition met in S4 is that the remaining oil quantity in the first fuel tank is greater than or equal to 90%, there is a possibility of continuously cyclically switching to the second working mode in S5 until the oil quantities in both fuel tanks are consumed to less than 10%; if the switching condition met in S4 is that the remaining oil quantity in the second fuel tank is less than or equal to 10%, the cycle in S5 will not continue. After the oil quantity in the first fuel tank is also consumed to 10% in the first working mode of S4, the warning module sends an oil quantity warning signal to remind the driver that fuel needs to be replenished. Here, the warning value set by the warning module is the same as the second switching threshold, making the comprehensive judgment of the oil circuit switching and the oil quantity warning signal smoother and avoiding the generation of system judgment blind spots.

[0055] In another technical solution, in the vehicle intelligent oil change method, when the vehicle is powered on again after being shut down, the controller reads the operating mode data recorded before the shutdown through the self-test module and compares the operating state of the drive mechanism under the operating mode with the operating state of the drive mechanism detected after powering on. If the two are inconsistent, the operating state of the drive mechanism is calibrated based on the recorded operating state of the drive mechanism under the operating mode. The drive mechanism uses a valve motor, and the self-test module detects the rotational position of the valve motor. Information is exchanged between the self-test module and the control module. When the valve motor position signal is incorrect, the valve motor is driven to the correct position (i.e., the motor position corresponding to the operating mode set by the control module) during the self-test period. When the vehicle is powered on again after being shut down, the operating mode of the switching system defaults to the operating mode before the shutdown, rather than re-determining the remaining fuel in the two tanks. After the operating mode is selected, if the first operating mode is selected, the oil circuit is switched normally according to steps S3-S5; if the second operating mode is selected, the oil circuit is switched according to steps S4-S5. When the driver refuels externally according to the warning information, the two fuel tanks return to the initial state by default. At this time, the controller state is initialized and the oil change control is performed again according to the steps S2-S5.

[0056] In another technical solution, in the intelligent vehicle oil change method, when the vehicle is powered on again after being shut down, the controller uses the liquid level difference detection module to read the liquid level data recorded by the two liquid level sensors before the vehicle is shut down. The controller then calculates the difference between the difference and the real-time liquid level data detected after power-on. If the difference between the two liquid level sensors exceeds a set value, the early warning module sends a fault signal. Specifically, at each vehicle shutdown, the liquid level information of the first and second fuel tanks is stored via software. At each power-on (IGN ON) cycle, the previous tank level information is read back and subtracted from the current level. If the difference exceeds a set threshold, the system reports a fault.

[0057] In another technical solution, in the vehicle intelligent oil change method, when the control module sets or switches the operating mode, the self-locking excitation module reads the operating state of the drive mechanism under the new operating mode and applies an excitation source in the same direction to the drive mechanism after the operating state conversion is completed. In the above technical solution, the valve motor is easily affected by the high-frequency vibration of the vehicle chassis and the pressure on the pipeline in actual application scenarios, and the motor may fail to self-lock or seal poorly during use. To prevent this phenomenon and ensure the sealing of the oil supply pipeline, a self-locking excitation module is set up through software integration. Whenever the valve motor completes rotation, it is boosted in its expected direction to achieve "locking excitation" control of the valve motor and ensure its self-locking.

[0058] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. An intelligent vehicle oil change system, characterized in that, Comprising: Two fuel tanks, including a first fuel tank and a second fuel tank arranged at intervals; Two liquid level sensors, which are respectively arranged in the two fuel tanks, and any one of the liquid level sensors is set to detect the liquid level height in the corresponding fuel tank; A commutation system, which is arranged between the engine and the two fuel tanks. The commutation system includes a two-position three-way valve, whose input end is communicated with the fuel supply pipe of the engine, and the two output ends of the two-position three-way valve are respectively communicated with the first fuel tank and the second fuel tank through a suction pipe and a guide pipe; a driving mechanism, which is set to adjust the spool position of the two-position three-way valve; A return pipe, which communicates the first fuel tank and the oil return hole of the engine; A controller, which is electrically connected to the two liquid level sensors and the driving mechanism. The controller includes an oil quantity detection module, which collects the real-time liquid level height data of the two liquid level sensors; a control module, which receives the real-time liquid level height data from the oil quantity detection module and switches the working mode of the commutation system according to the set switching threshold; an early warning module, which receives the real-time liquid level height data from the oil quantity detection module and conducts an oil quantity early warning according to the set early warning value; a self-check module, which is used to calibrate the working state of the driving mechanism when the vehicle is powered on; a liquid level difference detection module, which is used to detect the liquid level difference in the fuel tank between when the vehicle is turned off and the next time it is powered on, and sends fault data to the early warning module when the detected liquid level difference exceeds the set value; a self-locking excitation module, which is used to conduct a boosting excitation in the expected direction after the driving mechanism changes its working state according to the set working mode; Wherein, in the first working mode, the driving mechanism drives the spool of the two-position three-way valve to move to block the output end passage corresponding to the guide pipe, and the fuel supply pipe supplies oil through the first fuel tank; in the second working mode, the driving mechanism drives the spool of the two-position three-way valve to move to block the output end passage corresponding to the suction pipe, and the fuel supply pipe supplies oil through the second fuel tank; The control strategy of the control module is: after the vehicle starts, the first working mode is preferentially adopted, and the liquid level heights of the fuel in the first fuel tank and the second fuel tank are obtained by reading the real-time liquid level height data of the oil quantity detection module. When the liquid level heights in the two fuel tanks meet the set logical conditions for oil circuit switching, the control module sends a control signal to the driving mechanism to drive the valve motor to change the fuel flow direction of the fuel supply pipeline and switch to the second working mode; the above oil circuit switching process is cycled under the same set of oil circuit switching logic.

2. The vehicle intelligent oil change system according to claim 1, wherein, The controller further includes a filtering module, which receives the real-time liquid level height data from the oil quantity detection module, filters it, and then transmits it to the control module and the early warning module.

3. A vehicle intelligent oil change method based on the vehicle intelligent oil change system according to any one of claims 1-2, characterized in that, Comprising: S1. Set two switching thresholds, including a first switching threshold and a second switching threshold, and the first switching threshold is greater than the second switching threshold; S2. Set that both fuel tanks are full of oil in the initial state. When the vehicle is powered on, the control module is set to the first working mode. The fuel supply pipe supplies oil to the engine through the first fuel tank, and the engine returns oil to the first fuel tank through the return pipe; S3. During the vehicle driving process, the control module reads and compares the real-time liquid level height data in the two fuel tanks. When the percentage of the liquid level height in the first fuel tank accounting for the total height of the first fuel tank is less than the second switching threshold and the percentage of the liquid level height in the second fuel tank accounting for the total height of the second fuel tank is greater than the first switching threshold, the control module switches to the second working mode, and the fuel supply pipe supplies fuel to the engine through the second fuel tank. S4. The control module continuously compares the real-time liquid level height data in the two fuel tanks. When the percentage of the liquid level height in the first fuel tank accounting for the total height of the first fuel tank is greater than or equal to the first switching threshold or the percentage of the liquid level height in the second fuel tank accounting for the total height of the second fuel tank is less than or equal to the second switching threshold, the control module switches back to the first working mode. S5. Repeat the steps of S3 - S4, and the control module automatically and cyclically switches the working mode according to the real-time liquid level height data in the two fuel tanks. Among them, when the percentages of the liquid level heights in the two fuel tanks accounting for the total heights of the corresponding fuel tanks are both less than the second switching threshold, an oil quantity warning signal is sent through the warning module.

4. The vehicle intelligent oil change method according to claim 3, wherein, When the vehicle is restarted after being turned off, the controller reads the working mode data recorded before turning off through the self-check module, and compares the working state of the driving mechanism in this working mode with the working state of the driving mechanism detected after power-on. When the two are inconsistent, the working state of the driving mechanism is calibrated based on the working state of the driving mechanism in the recorded working mode.

5. The vehicle intelligent oil change method according to claim 3, characterized in that When the vehicle is restarted after being turned off, the controller reads the liquid level height data of the two liquid level sensors recorded before turning off through the liquid level difference detection module, and calculates the difference between it and the real-time liquid level height data detected after power-on. When the difference of the same liquid level sensor is greater than the set value, a fault signal is sent through the warning module.

6. The vehicle intelligent oil change method according to claim 3, wherein When the control module sets or switches the working mode, the self-locking excitation module reads the working state of the driving mechanism in the new working mode and applies an excitation source in the same direction after the working state of the driving mechanism is converted.

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