Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/30—Controlling fuel injection
  • F02D41/3082—Control of electrical fuel pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
  • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2200/00—Input parameters for engine control
  • F02D2200/02—Input parameters for engine control the parameters being related to the engine
  • F02D2200/06—Fuel or fuel supply system parameters
  • F02D2200/0602—Fuel pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2200/00—Input parameters for engine control
  • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
  • F02D2200/602—Pedal position
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2250/00—Engine control related to specific problems or objectives
  • F02D2250/31—Control of the fuel pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/04—Feeding by means of driven pumps
  • F02M37/08—Feeding by means of driven pumps electrically driven
  • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir

Definitions

• Embodiments of the present disclosure generally relate to a vehicle, and more particularly to a fuel supply system of an engine of a vehicle and a fuel supply control method for an engine of a vehicle.
• Conventional fuel supply systems for an engine of a vehicle generally aim at supplying adequate fuel to the engine in a variety of driving conditions, including when the engine is at idle.
• the conventional fuel supply systems are typically classified into following several types.
• the fuel is pumped to the engine by a fuel pump, and residual fuel flows to a fuel tank with the aid of a pressure regulator.
• a temperature of the fuel in the fuel tank of such fuel supply system is increased due to a high temperature of the backflow fuel, thus resulting in that generated vapor is difficult to meet the Evaporative emission requirements.
• the fuel pump is combined with a fuel filter by adding a pressure regulator to form a fuel pump module and the fuel pump module is mounted in the fuel tank.
• the fuel pumped by the fuel pump is firstly filtered by the fuel filter and regulated by the pressure regulator, and then a part of the fuel is pumped to the engine.
• the other part of the fuel is returned to the fuel tank by the pressure regulator so as to restrain an increment of the fuel temperature, thus reducing the possibility to generate vapor.
• the fuel pump starts to work continuously, and thus the energy waste problem caused by pumping fuel and then draining fuel cannot be solved.
• Embodiments of the present disclosure seek to solve at least one of the problems existing in the prior art to at least some extent.
• one objective of the present disclosure is to provide a fuel supply system for an engine of a vehicle, which can perform a fuel supply in real time according to a current fuel demand of the engine, realize an intelligent fuel supply for the engine, has high safety and no pollution, and reduce a cost.
• Another objective of the present disclosure is to provide a fuel supply control method for an engine of a vehicle.
• a fuel supply system for an engine of a vehicle.
• the fuel supply system includes: a first detecting unit, configured to detect an operating state of the vehicle to generate an operating state signal; an engine control unit, connected with the first detecting unit and configured to obtain an opening degree of a throttle valve according to the operating state signal when the engine is working, to query a predetermined table indicating a relationship between opening degrees of the throttle valve and fuel demands to obtain a current fuel demand, and to generate a fuel demand control signal based on the current fuel demand; a fuel pump, configured to supply fuel to the engine; a fuel pump motor, configured to drive the fuel pump; and a fuel pump motor control unit, connected with the fuel pump motor and the engine control unit respectively and configured to control the fuel pump motor according to the fuel demand control signal.
• the fuel pump can supply fuel to the engine in real time according to the current fuel demand of the engine, thus realizing an intelligent and precise fuel supply, improving an efficiency of the fuel pump motor, reducing energy waste from fuel pumping to fuel returning, and having advantages of noiselessness, long service life, low pollution, safety and environment-friendliness. Furthermore, with the fuel supply system according to embodiments of the present disclosure, a number of fuel returning lines can be decreased, thus having advantages of compact spatial arrangement, less components and low manufacturing cost.
• a fuel supply control method for an engine of a vehicle includes: detecting an operating state of a vehicle to generate an operating state signal when the engine is working; obtaining an opening degree of a throttle valve according to the operating state signal, querying a predetermined table indicating a relationship between opening degrees of the throttle valve and fuel demands to obtain a current fuel demand, and generating a fuel demand control signal based on the current fuel demand; and controlling a fuel pump motor of the vehicle according to the fuel demand control signal.
• a fuel supply to the engine can be performed in real time according to the current fuel demand of the engine, thus realizing an intelligent and precise fuel supply, improving an efficiency of the fuel pump motor, reducing energy waste from fuel pumping to fuel returning, and having advantages of noiselessness, long service life, low pollution, safety and environment- friendliness when supplying fuel. Furthermore, the method is easy to implement.
• Fig. 1 is a schematic diagram of a fuel supply system for an engine of a vehicle according to an embodiment of the present disclosure
• Fig. 2 is a schematic diagram of a fuel supply system for an engine of a vehicle according to another embodiment of the present disclosure
• Fig. 3 is a flow chart of a fuel supply control method for an engine of a vehicle according to an embodiment of the present disclosure.
• Fig. 4 is a flow chart of a fuel supply control method for an engine of a vehicle according to another embodiment of the present disclosure.
• first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance.
• features limited by “first” and “second” are intended to indicate or imply including one or more than one these features.
• a plurality of relates to two or more than two.
• a structure in which a first feature is "on" a second feature may include an embodiment in which the first feature directly contacts the second feature, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature so that the first feature does not directly contact the second feature, unless otherwise specified.
• a first feature "on,” “above,” or “on top of a second feature may include an embodiment in which the first feature is right “on,” “above,” or “on top of the second feature, and may also include an embodiment in which the first feature is not right “on,” “above,” or “on top of the second feature, or just means that the first feature has a sea level elevation larger than the sea level elevation of the second feature.
• first feature "beneath,” “below,” or “on bottom of a second feature may include an embodiment in which the first feature is right “beneath,” “below,” or “on bottom of the second feature, and may also include an embodiment in which the first feature is not right “beneath,” “below,” or “on bottom of the second feature, or just means that the first feature has a sea level elevation smaller than the sea level elevation of the second feature.
• Fig. 1 is a schematic diagram of a fuel supply system for an engine of a vehicle according to an embodiment of the present disclosure.
• the fuel supply system 1000 includes a first detecting unit 10, an engine control unit 20, a fuel pump 30, a fuel pump motor 40, and a fuel pump motor control unit 50.
• the first detecting unit 10 is configured to detect an operating state of the vehicle to generate an operating state signal. For example, the first detecting unit 10 detects whether the vehicle is in an accelerating or a decelerating operation state, that is, the first detecting unit 10 detects a driver's driving intention.
• the first detecting unit 10 may be configured as a sensor.
• the sensor refers to a device for measuring respective instantaneous physical signal of an engine 60 or a vehicle, and converting the respective instantaneous physical signal to a corresponding electrical signal for calculating an instantaneous fuel demand of the engine 60.
• the sensor may be of different types and models.
• the engine control unit (ECU) 20 is connected with the first detecting unit 10.
• the engine control unit 20 is configured to obtain an opening degree of a throttle valve according to the operating state signal when the engine 60 is working, to query a predetermined table indicating a relationship between opening degrees of the throttle valve and fuel demands to obtain a current fuel demand, and to generate a fuel demand control signal based on the current fuel demand.
• the predetermined table indicating a relationship between opening degrees of the throttle valve and fuel demands may be stored in the engine control unit 20 in advance.
• the engine 60 may be configured as a port injection engine or a direct injection engine.
• the fuel pump 30 is configured to supply fuel to the engine 60.
• the fuel pump motor 40 is disposed in a fuel tank 70 of the vehicle.
• the fuel pump motor 40 is configured to drive the fuel pump 30.
• the fuel pump motor 40 is a brushless variable-frequency motor.
• An armature winding of the brushless variable-frequency motor is disposed in a stator core.
• a permanent magnet is fixed to a rotor. The position of permanent magnet poles is detected by a rotor position sensor, and then a conduction state of a stator winding is determined, thus making the motor generate a stable and continuous electromagnetic torque.
• the brushless variable-frequency motor is disposed inside a pump body of the fuel pump30 and controlled by the fuel pump motor control unit 50.
• the fuel pump motor control unit 50 is connected with the fuel pump motor 40 and the engine control unit 20 respectively.
• the fuel pump motor control unit 50 is configured to control the fuel pump motor 40 according to the fuel demand control signal.
• the fuel pump motor control unit 50 queries a predetermined table indicating a relationship between rotating speeds of the fuel pump motor 40 and the fuel demands to obtain a rotating speed of the fuel pump motor 40 corresponding to the current fuel demand, and controls the fuel pump motor 40 according to the rotating speed of the fuel pump motor 40.
• the predetermined table indicating a relationship between rotating speeds of the fuel pump motor 40 and the fuel demands may be stored in the fuel pump motor control unit 50 in advance.
• the fuel pump motor 40 is connected with a power source 110 via a power wire 80.
• the fuel pump motor 40 is also grounded.
• a voltage of the power source 110 can be 12V, 42V or 48V.
• the first detecting unit 10 may be connected with the engine control unit 20 via a CAN bus 90, and the engine control unit 20 may be connected with the fuel pump motor control unit 50 via the CAN bus 90.
• the first detecting unit 10 may communicate with the engine control unit 20 via a CAN network
• the engine control unit 20 may communicate with the fuel pump motor control unit 50 via the CAN network.
• the fuel pump motor control unit 50 can communicate with the engine control unit 20 via the CAN network to obtain the fuel demand information of the engine 60 in real time, so that the fuel pump motor control unit 50 can supply the fuel precisely as actual demand by controlling the rotating speed of the fuel pump motor 40.
• a check valve 11 (also called as a pressure retaining valve) conducted along a direction from the fuel pump 30 to the engine 60 is disposed in a fuel supply line 100 between the engine 60 and the fuel pump 30. It should be noted that a number of the check valve 11 is not limited to be one, but also may be more than one. The check valve 11 is used to make the fuel flow one way and retain the fuel pressure.
• the fuel supply system further includes a second detecting unit 12.
• the second detecting unit 12 is configured to detect a fuel pressure of the fuel supply line 100 between the check valve 11 and the engine 60 (such as an electronic injection actuator of the engine 60).
• the second detecting unit 12 is connected with fuel pump motor control unit 50.
• the fuel pump motor control unit 50 is further configured to control the fuel pump motor according to the fuel pressure and the fuel demand control signal.
• the second detecting unit 12 is a line pressure sensor.
• the fuel pump motor control unit 50 increases the rotating speed of the fuel pump motor 40.
• the fuel pump motor control unit 50 stops the fuel pump motor 40, in which the first predetermined threshold is lower than the second predetermined threshold. That is, when the fuel pressure is less than the first predetermined threshold, the fuel pump motor control unit 50 increases the rotating speed of the fuel pump motor 40 to increase the fuel supply, so as to enhance the fuel pressure of the fuel supply line 100, until the fuel pressure reaches the second predetermined threshold.
• the first predetermined threshold can be set according to actual conditions.
• the fuel pump motor control unit 50 controls the fuel pump motor 40 to increase the rotating speed so as to supply more fuel than the engine control unit 20 requires.
• the fuel pump motor control unit 50 controls the fuel pump motor 40 to stop, so as to stop supplying fuel.
• the fuel pump motor control unit 50 controls the rotating speed of the fuel pump motor 40 according to the detected fuel pressure and the fuel demand control signal.
• the fuel pump motor control unit 50 should control the fuel pump motor 40 to increase the rotating speed so to supply fuel on demand.
• the fuel pump motor control unit 50 controls the fuel pump motor 40 to stop rotating in practice, so as to avoid a further increment of the fuel pressure.
• the fuel pump motor control unit 50 controls the fuel pump motor 40 to rotate so as to drive the fuel pump 30, and opens the check valve 11, thus supplying fuel into the fuel supply line 100.
• the fuel flows to the engine 60 through the check valve 11, and generate a fuel pressure in the fuel path 100 from the check valve 11 to the engine 60.
• the line pressure sensor detects the fuel pressure.
• the fuel pump motor control unit 50 controls the fuel pump motor 40 to stop rotating and closes the check valve 11, so that the fuel pressure in the fuel path 100 from the check valve 11 to the engine 60 is unchanged.
• the engine control unit 20 stops sending the fuel demand control signal to the fuel pump motor control unit 50, the fuel pump motor control unit 50 controls the fuel pump motor 40 to stop rotating and closes the check valve 11, thus preventing the fuel from returning.
• the fuel supply system can supply fuel in real time according to the engine's fuel demand, and has advantages of intelligent fuel supply, high safety and non-pollution.
• a fuel return line is cancelled in the fuel supply system according to the present disclosure, which may reduce the cost, and solve a vapor emission problem resulting from frequent fuel flowing.
• the brushless variable-frequency motor rather than the brush motor to the fuel supply system, the service life of the fuel pump is prolonged, the risk of generating sparks is reduced and safety is ensured.
• the fuel pump can supply fuel to the engine in real time according to the current fuel demand of the engine, thus realizing an intelligent and precise fuel supply, improving an efficiency of the fuel pump motor, reducing energy waste from fuel pumping to fuel returning, and having advantages of noiselessness, long service life, low pollution, safety and environment-friendliness. Furthermore, with the fuel supply system according to embodiments of the present disclosure, a number of fuel returning lines can be decreased, thus having advantages of compact spatial arrangement, less components and low manufacturing cost.
• Fig. 3 is a flow chart of a fuel supply control method for an engine of a vehicle according to an embodiment of the present disclosure. As shown in Fig. 3, the method includes following steps.
• step S I when the engine is working, an operating state of a vehicle is detected to generate an operating state signal.
• a sensor detects the operating state of the vehicle in real time and generates the operating state signal.
• the sensor refers to a device for measuring respective instantaneous physical signal of the engine or the vehicle and converting the respective instantaneous physical signal to a corresponding electric signal for calculating an instantaneous fuel demand of the engine.
• the sensor may be of different types and models.
• step S2 an opening degree of a throttle valve is obtained according to the operating state signal, a predetermined table indicating a relationship between opening degrees of the throttle valve and fuel demands is queried to obtain a current fuel demand, and a fuel demand control signal is generated based on the current fuel demand.
• the predetermined table indicating a relationship between opening degrees of the throttle valve and fuel demands may be pre- stored in an engine control unit.
• a fuel pump motor is controlled according to the fuel demand control signal.
• a predetermined table indicating a relationship between rotating speeds of the fuel pump motor and the fuel demands is queried to obtain a rotating speed of the fuel pump motor corresponding to the current fuel demand, and then the fuel pump motor is controlled according to the rotating speed of the fuel pump motor.
• the predetermined table indicating a relationship between rotating speeds of the fuel pump motor and the fuel demands may be pre- stored in a fuel pump motor control unit.
• the fuel pump motor is a brushless variable-frequency motor.
• Fig. 4 is a flow chart of a fuel supply control method for an engine of a vehicle according to another embodiment of the present disclosure. As shown in Fig. 4, the method includes following steps.
• a driver's driving intention is sent out. That is, the driver's driving intention is embodied by the operating state of the vehicle or the engine, which is detected by the sensor to generate the operating state signal for sending to the engine control unit.
• an instantaneous fuel demand is calculated according to a preset fuel supply demand model.
• the engine control unit calculates the instantaneous fuel demand according to the preset fuel supply demand model when receiving the operating state signal, and generates a fuel demand control signal according to the instantaneous fuel demand.
• the instantaneous fuel demand is sent out.
• the engine control unit sends the fuel demand control signal to the fuel pump motor control unit via the CAN network and controls the injection actuator to inject fuel and burn.
• an instantaneous control strategy for the fuel pump motor is calculated according to a fuel supply model.
• the fuel pump motor control unit receives the fuel demand control signal, obtains the rotating speed of the fuel pump motor according to the preset fuel supply model of the fuel pump under different rotating speeds, and controls the fuel pump motor to drive the fuel pump to supply fuel according to the obtained rotating speed.
• a check valve disposed in the fuel supply line between the engine and the fuel pump is open, so as to ensure the fuel pressure of the fuel supply line.
• step S 105 the fuel pressure of the fuel supply line between the engine and the fuel pump is detected.
• a line pressure sensor is used to detect the fuel pressure in real time, and to send the detected fuel pressure to the fuel pump motor control unit.
• step S 106 it is determined whether the fuel pressure is within a normal range, for example between a first predetermined threshold and a second predetermined threshold (the first predetermined threshold is lower than the second predetermined threshold); if yes, execute step S107; and if no, execute step S 108.
• step S 107 the fuel pump motor control unit controls the fuel pump motor to rotate at a speed corresponding to the instantaneous fuel demand, and then execute step S il l.
• step S 108 it is determined whether the fuel pressure of the fuel supply line is lower than the first predetermined threshold; if yes, execute step S109; and if no, execute step S I 10.
• step S109 the rotating speed of the fuel pump motor is increased so as to control the fuel pump to supply more fuel.
• step S I 10 it is determined whether the fuel pressure of the fuel supply line reaches the second predetermined threshold; if yes, execute step S I 12; and if no, execute step S ill.
• step S ill the fuel pump is controlled to supply fuel normally.
• step S I 12 the fuel pump motor is stopped.
• the fuel pump executes corresponding instructions.
• the fuel pump motor control unit controls the rotating speed of the fuel pump motor according to the detected fuel pressure and the fuel demand control signal.
• the fuel pump motor control unit increases the rotating speed of the fuel pump motor.
• the fuel pump motor control unit stops the fuel pump motor.
• the fuel pressure shall prevail.
• the fuel pump motor control unit should control the fuel pump to increase the rotating speed so as to supply fuel as required.
• the fuel pump motor control unit controls the fuel pump to stop.
• the engine control unit stops sending the fuel demand control signal to the fuel pump motor control unit, and the fuel pump motor control unit controls the fuel pump to stop rotating and closes the check valve, thus preventing the fuel from returning.
• a fuel supply to the engine can be performed in real time according to the current fuel demand of the engine, thus realizing an intelligent and precise fuel supply, improving an efficiency of the fuel pump motor, reducing energy waste from fuel pumping to fuel returning, and having advantages of noiselessness, long service life, low pollution, safety and environment- friendliness when supplying fuel. Furthermore, the method is easy to implement.
• Any procedure or method described in the flow charts or described in any other way herein may be understood to comprise one or more modules, portions or parts for storing executable codes that realize particular logic functions or procedures.
• advantageous embodiments of the present disclosure comprises other implementations in which the order of execution is different from that which is depicted or discussed, including executing functions in a substantially simultaneous manner or in an opposite order according to the related functions. This should be understood by those skilled in the art which embodiments of the present disclosure belong to.
• the logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment.
• the computer readable medium may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment.
• the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM).
• the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in a electric manner, and then the programs may be stored in the computer memories.
• each part of the present disclosure may be realized by the hardware, software, firmware or their combination.
• a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instruction execution system.
• the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
• each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module.
• the integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may be stored in a computer readable storage medium.
• the storage medium mentioned above may be read-only memories, magnetic disks or CD, etc.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Lubrication Of Internal Combustion Engines (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

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• 2013
  • 2013-03-28 CN CN201310105913.5A patent/CN104074648B/zh active Active
• 2014
  • 2014-03-27 WO PCT/CN2014/074190 patent/WO2014154159A1/en active Application Filing

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