CN114893328B - Range-extending type light truck fuel evaporation system and refueling control carbon tank desorption method - Google Patents
Range-extending type light truck fuel evaporation system and refueling control carbon tank desorption method Download PDFInfo
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- CN114893328B CN114893328B CN202210568639.4A CN202210568639A CN114893328B CN 114893328 B CN114893328 B CN 114893328B CN 202210568639 A CN202210568639 A CN 202210568639A CN 114893328 B CN114893328 B CN 114893328B
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- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
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- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
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- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention discloses a range-extending type light-truck fuel evaporation system and a refueling control carbon tank desorption method, which utilize the speed of a vehicle to judge whether a refueling event is completed, are accurate and efficient, and simultaneously increase a refueling amount identification function, so that the carbon tank desorption requirement after refueling can be met, the risk of escape of refueling steam into the atmosphere is avoided, the carbon tank desorption frequency can be optimized, the energy is saved, and the range-extending type light-truck fuel evaporation system has the advantages of accuracy, high efficiency, safety, reliability, energy conservation and environmental protection, and synchronously reduces customer complaints. The main hardware of the invention is a set of highly integrated high-pressure fuel evaporation control system, which not only reduces the demand on the mounting point of the chassis frame, but also does not need components such as a passenger car refueling small door, a refueling small door switching mechanism, a switching position sensor and the like, increases a fuel filler cap, saves the layout space of the chassis, improves the satisfaction of customers, and the modularized design realizes good generalization of a vehicle type platform and can save investment and development cost.
Description
Technical Field
The invention relates to the technical field of extended range light-truck fuel evaporation control, in particular to an extended range light-truck fuel evaporation system and a refueling control carbon tank desorption method.
Background
The new energy automobile can reduce the fuel consumption in the use process, can effectively reduce the carbon emission, and is a future development trend of the automobile. The hybrid electric vehicle has the advantages of the pure electric vehicle and the traditional diesel locomotive, and is the dominant force for the development of new energy vehicles in a short period. In a plurality of hybrid power system architectures, the range extender (architecture of series hybrid) has simple layout, is always driven by pure electricity, has excellent drivability, power responsiveness, fuel economy and longer endurance mileage, and is particularly suitable for the field of light trucks. The state six emission level range-increasing gasoline vehicle generally adopts a high-pressure fuel evaporation control system (NICRO system), and because the high-pressure fuel tank is high-pressure for a long time, pressure relief and then refueling are needed. The passenger car field detects the oil tank pressure through the pressure sensor in the high-pressure fuel tank, if after the pressure release high-pressure fuel tank pressure is less than certain threshold value, by the electronic little door of refueling on the automobile body panel beating of automobile body controller BCM control opening, then the manual work just can open the filler cap and refuel, after the oil addition, the manual work closes electronic little door of refueling, the position switch sensor closure on the little door of refueling notifies automobile body controller BCM to refuel and accomplishes, finally engine control module ECU closes the oil tank isolation valve. However, the extended range light truck has no small oil filler door and position switch sensor, only the oil filler cover, the engine control module ECU can not ensure that the oil filler cover is opened under the condition of low pressure when the oil filler cover is in a high-pressure fuel tank, the risk of oil ejection of the oil filler cover is opened under the high-pressure state exists, the completion of oil filling can not be identified, and the isolation valve of the fuel tank can not be closed in time. When the extended range light truck is full of oil, fuel vapor displaced by oil in the high-pressure fuel tank is completely adsorbed in the carbon tank, and whether the refueling is finished cannot be identified, so that the carbon tank cannot be fully desorbed, and the risk that the fuel vapor escapes to the atmosphere is easily generated. In addition, the range-extended light truck engine is generally not operated, and has no desorption amount at all, or is operated under the most economical working condition, and the vacuum degree generated by the air inlet manifold is low, so that the desorption amount of the carbon tank is insufficient, and the carbon tank possibly has the risk of fuel steam escaping into the atmosphere after long-time accumulation. The vehicle body of the extended range light truck type passenger-free vehicle comprises components such as a high-pressure fuel tank, a fuel tank isolation valve, a carbon tank, an inflating pump, a carbon tank ash filter, a pressure sensor, an oil filling pipe and the like which are required to be arranged on the two types of chassis, and the problems of insufficient installation points of the two types of chassis and serious waste of arrangement space exist.
Disclosure of Invention
The invention aims to solve the problems, and provides a range-extending type light-truck fuel evaporation system and a refueling control carbon tank desorption method, which are used for solving the problems that a range-extending type light truck is prevented from opening a filler cap before a high-pressure fuel tank is depressurized to a certain safety threshold before refueling, after refueling, a fuel tank isolation valve is closed for sealing after recognizing that the refueling operation is finished, and the accurate carbon tank desorption after refueling is realized according to the actual refueling amount, and the risk that fuel steam is accumulated and escapes into the atmosphere due to insufficient long-time desorption amount of a carbon tank is solved, and meanwhile, a set of highly integrated modularized high-pressure fuel evaporation control system is provided, so that the requirement on a chassis frame mounting point is reduced, and the chassis arrangement space is saved.
A method for desorbing a refueling control carbon tank of a range-extended light truck fuel vaporization system comprises the following steps of
S1, a cab gives a fueling instruction;
s2, an engine control module ECU detects whether the vehicle has a high pressure: if the whole vehicle does not have high pressure, the VCU sends a fuel filling prohibition signal to the whole vehicle instrument, and the whole vehicle instrument displays 'flameout is not performed and fuel filling is prohibited'; if the high voltage is pressed, the whole vehicle controller VCU is awakened by a hard wire, meanwhile, the whole vehicle controller VCU actuation main relay wakes up the engine control module ECU, and continuously transmits a refueling request signal to the engine control module ECU and the whole vehicle instrument until the whole vehicle controller VCU actuation main relay wakes up the engine management system EMS, and transmits the refueling request signal to the engine management system EMS and the flow fault or end of the whole vehicle instrument, and the whole vehicle instrument records the current fuel quantity value V 1 The ECU controls the oil tank isolation valve to open for pressure relief;
s3, an engine control module ECU detects an internal pressure signal of the fuel tank and starts timing for 10 seconds, and a prompt is given according to the current high-pressure fuel tank pressure whole vehicle instrument;
s4, detecting the vehicle speed by the whole vehicle controller VCU and judging the duration time of the oiling process; after oiling is completed, the VCU of the whole vehicle controller starts timing, and the vehicle speed is more than or equal to 5km/h and enters step S5; the speed of the vehicle is less than 5km/h, and the VCU of the whole vehicle controller continuously carries out manual refueling when judging that the duration time of the refueling process is less than 15 minutes; the speed of the vehicle is less than 5km/h, and the VCU of the whole vehicle controller judges that the duration time of the oiling process is more than 15 minutes and enters the step S5;
s5, measuring the oil quantity value V after oiling by using a whole vehicle instrument 2 The whole vehicle instrument calculates the current added oil quantity value V f And V is combined with f The value of (2) is sent to the whole vehicle controller VCU and the engine control module ECU;
s6, judging the current added oil quantity value V of the whole vehicle instrument by the whole vehicle controller VCU and the engine control module ECU f Is a value of (2); currently added oil quantity value V f The value of (2) is larger than 5L, the VCU starts the engine to execute the carbon tank desorption program, and the step S7 is executed; currently added oil quantity value V f The value of (2) is less than or equal to 5L, the ECU controls the oil tank isolation valve to be closed, the VCU detects the power gear, the power gear is the ON gear and is not processed, and the power gear is the OFF gear and is disconnectedA main relay, and the oiling process is completed;
s7, the current added oil quantity value V f The value of the fuel quantity is larger than 5L, and the VCU of the whole vehicle controller reads the current fuel quantity signal of the whole vehicle instrument and compares the current fuel quantity signal with the alarm fuel quantity of 5L; the carbon tank desorption program is started when the alarm oil quantity warning line reaches or exceeds 5L; step S8 is executed when the alarm oil quantity warning line 5L is not reached;
s8, an engine control module ECU collects signals of a pressure sensor and compares the signals with warning pressure P1; the pressure of the high-pressure fuel tank reaches or exceeds the warning pressure P1, and a carbon tank desorption program is started; step S9 is performed without reaching the guard pressure P1 of the high-pressure fuel tank; the warning pressure P1 is the opening pressure of a mechanical safety valve of the oil tank isolation valve;
s9, calculating steam overflow quantity of the accumulated oil tank; and when the accumulated oil tank steam overflow quantity S is less than or equal to 70% of carbon tank adsorption working capacity and the engine works normally and the accumulated oil tank steam overflow quantity S is more than 70% of carbon tank adsorption working capacity, starting a carbon tank desorption program.
Specifically, in the step S3, the prompt given by the current high-pressure fuel tank pressure vehicle instrument includes: displaying a prompt that the high-pressure fuel tank is pressure-relieving, and after 10 seconds, if the pressure of the high-pressure fuel tank is more than 2kpa, reporting a pressure-relieving fault of the fuel tank by an engine control module ECU and displaying the pressure-relieving fault of the high-pressure fuel tank on a whole vehicle instrument, wherein maintenance is requested; if the pressure of the high-pressure fuel tank is less than or equal to 2kpa, the whole vehicle instrument displays that the pressure relief is finished and the fuel is filled, and at the moment, a fuel filler cap can be opened for manual fuel filling.
Specifically, the oil amount value V added in the step S6 f Oil quantity value V after refueling 2 And the current oil quantity value V 1 The difference of (1) is the current added oil quantity value, and satisfies V f =V 2 -V 1 。
Specifically, in the step S9, the vapor overflow amount of the accumulated tank satisfies the following formula:
S=N·B
in the above formula: s represents the steam overflow quantity of the accumulated oil tank;
n represents the accumulated opening times of an on-board self-diagnosis system OBD detection oil tank isolation valve;
b represents the maximum value detected by the test when the tank isolation valve opens the oil vapor overflowed from the tank.
Specifically, after the carbon tank desorption program is started, the whole vehicle instrument displays the working state of the carbon tank, and the carbon tank desorption work is continuously carried out until the desorption flow does not reach the flow threshold value of 500 BV; and when the desorption flow reaches the flow threshold value of 500BV, the engine resumes normal operation, and the whole vehicle instrument is closed for display.
In order to solve the problem that the components of the extended-range light-truck high-pressure fuel evaporation control system are insufficient in mounting points and arrangement space of a chassis, the high-pressure fuel tank, a carbon tank, an inflating pump, a carbon tank ash filter, a pressure sensor, an inflating pipe and an oil filler cap are integrated into a whole module, and are mounted on a frame through a left high-pressure fuel tank bracket arm support and a right high-pressure fuel tank bracket arm support. The carbon tank, the inflating pump and the carbon tank ash filter are ingeniously arranged on a bracket which is shaped like a Chinese character 'ji' and is higher than the upper surface of the high-pressure fuel tank through a bracket, the pressure sensor is integrated on the flange of the oil pump, the pressure sensor and the oil pump are arranged on the high-pressure fuel tank through a lock ring, and the oil filling pipe and the oil filler cap are connected with the bottom of the bracket of the left high-pressure fuel tank through bolts so as to form a whole with the high-pressure fuel tank module.
The invention also provides a light truck extended range type light truck fuel evaporation system which mainly comprises a high-pressure fuel tank, a fuel filler pipe assembly, a fuel filler cap, a carbon tank ash filter, a gas pump, a fuel tank isolation valve, a pressure sensor, an engine control module ECU, a whole vehicle controller VCU and a whole vehicle instrument; the high-pressure fuel tank is fixedly welded with a fuel filling pipe assembly, a fuel filling cover is arranged at the extension part of the fuel filling pipe assembly, and the fuel filling cover and the fuel filling pipe assembly are fixed at the tail end of the fuel filling pipe assembly through a lock catch; the carbon tank is communicated with the high-pressure fuel tank through a second carbon tank adsorption pipe fixed on the high-pressure fuel tank; the carbon tank ash filter is communicated with the other outlet of the carbon tank through a first carbon tank adsorption pipe; the carbon tank ash filter is connected with an inflating pump; the oil tank isolation valve is arranged between the first carbon tank adsorption pipe and the second carbon tank adsorption pipe; the engine control module ECU monitors information of a pressure sensor on the high-pressure fuel tank and controls a carbon tank adsorption program; and the VCU-attracted main relay wakes the engine control module ECU and continuously transmits a refueling request signal to the engine control module ECU and the whole vehicle instrument.
Specifically, when the pressure sensor senses that the pressure of the high-pressure fuel tank is more than 2kpa, the screwing key can not pop up the lock tongue of the fuel filler cap, the upper cover of the fuel filler cap can only idle, the fuel filler cap can not be opened, and when the pressure of the high-pressure fuel tank is less than or equal to 2kpa, the fuel filler cap is normally opened.
Specifically, the filler cap includes: the device comprises a lower cover body, a pressure sensing diaphragm, a return spring, a cap-shaped valve core, a lock tongue, a lock cylinder and an upper cover body; the lower cover body is installed inside the oil filling pipe assembly, the center of the bottom surface of the lower cover body is hollowed out, a pressure sensing diaphragm is installed, the pressure sensing diaphragm is always attached to the bottom surface of the lower cover body under the support of a return spring, a cap-shaped valve core is arranged on the outer ring of the return spring and is fixed in the middle of the lower cover body, a lock tongue is arranged above the cap-shaped valve core, movement of a lock core is limited, and the lock core is fixed in the middle of the upper cover body.
The invention has the beneficial effects that:
the invention provides a range-extending type light-truck fuel evaporation system and a refueling control carbon tank desorption method, which utilize the speed of a vehicle to judge whether a refueling event is completed, are accurate and efficient, and simultaneously increase a refueling amount identification function, so that the carbon tank desorption requirement after refueling can be met, the risk of escape of refueling steam into the atmosphere is avoided, the carbon tank desorption frequency can be optimized, the energy is saved, and the range-extending type light-truck fuel evaporation system has the advantages of accuracy, high efficiency, safety, reliability, energy conservation and environmental protection, and synchronously reduces customer complaints. The main hardware related by the invention is a set of highly integrated high-pressure fuel evaporation control system, so that the requirement on the mounting point of the chassis frame is reduced, components such as a passenger car refueling small door, a refueling small door switching mechanism and a switching position sensor are not needed, a fuel filler cap is added, the layout space of the chassis is saved, the satisfaction of customers is improved, the universality of a vehicle type platform is realized by a modularized design, and the investment and development cost can be saved.
Drawings
FIG. 1 is a flow chart of fueling control for an extended range light truck fuel vaporization system;
FIG. 2 is a flow chart of a method for desorbing a carbon tank after refueling an extended range light truck fuel vaporization system;
FIG. 3 is a schematic diagram of main hardware of the refueling control and carbon tank desorption method of the extended range light-truck fuel vaporization system;
FIG. 4 is a schematic diagram of a fuel filler cap structure;
FIG. 5 is a schematic diagram of an integrated modular extended range light-card fuel evaporation control system;
FIG. 6 is a block diagram of the carbon canister, the carbon canister mounting bracket and the bracket arm bracket of the high pressure fuel tank;
FIG. 7 is a view showing the mounting structure of the bracket of the air pump and the bracket of the high-pressure fuel tank;
FIG. 8 is a block diagram of a filler tube mounting bracket and a high pressure fuel tank bracket;
FIG. 9 is an assembly view of an extended range light truck fuel vaporization system;
wherein: 1. left high-pressure fuel tank bracket, 2, left high-pressure fuel tank bracket, 3, high-pressure fuel tank, 4, first carbon tank adsorption pipe, 5, right high-pressure fuel tank bracket, 6, right high-pressure fuel tank bracket, 7, tank isolation valve, 8, second carbon tank adsorption pipe, 9, carbon tank ash filter, 10, inflating pump, 11, inflating pump bracket, 12, vent pipe, 13, carbon tank, 14, carbon tank bracket, 15, frame, 16, carbon tank desorption pipe, 17, engine oil supply pipe, 18, filter, 19, oil filling pipe assembly, 20, oil filling pipe mounting bracket, 21, oil filling cover, 211, lower cover body, 212, pressure sensing diaphragm, 213, return spring, 214, cap valve core, 215, lock tongue, 216, lock core, 217, upper cover body, 22, oil pump delivery module, 23 and pressure sensor.
Description of the embodiments
The invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, a method for desorbing a refueling control carbon tank of a range-extended light-truck fuel vaporization system is provided:
s1, a cab gives a fueling instruction;
s2, if the whole vehicle does not have high pressure, the whole vehicle controller VCU sends a fuel filling prohibition signal to a whole vehicle instrument, and the whole vehicle instrument displays 'flameout is not performed and fuel filling is prohibited'; if the high voltage is pressed, the whole vehicle controller VCU is awakened by a hard wire, and meanwhile, the whole vehicle controller VCU is attracted to the main relay to awaken the engine control module ECU and continuously send a refueling request signal to the engine control module ECU and the whole vehicle instrument until the event is failed or ended, and the whole vehicle instrument records the current fuel quantity value V 1 The engine control module ECU controls the oil tank isolation valve to open for pressure relief and sends a state signal of opening the oil tank isolation valve;
s3, an engine control module ECU detects an internal pressure signal of the oil tank, calculates an absolute value of a difference value between the current oil tank pressure and the atmospheric pressure, and starts timing for 10 seconds; when the absolute value of the difference value between the pressure of the high-pressure fuel tank and the atmospheric pressure is more than 2kpa, the engine control module ECU reports a tank pressure relief fault, the engine control module ECU sends a pressure relief fault signal to the whole vehicle instrument and the VCU, the event is ended after the sending time lasts for 5 seconds, the whole vehicle instrument sounds for 5 seconds after receiving the fault signal and displays the information of the pressure relief fault of the high-pressure fuel tank, the engine control module ECU then controls the electromagnetic valve to be closed, the whole vehicle controller VCU judges the current power gear after receiving the fault signal, the timing is started, the ON gear is not processed, the main relay is disconnected after the OFF gear is timed for 15 seconds (the timing is 15 seconds is required according to the time length for closing the electromagnetic valve), and maintenance is applied; when the absolute value of the difference between the oil tank pressure and the atmospheric pressure is detected to be less than or equal to 2Kpa (the absolute value can be calibrated) within 10 seconds by the EMS, a pressure release completion signal is sent to the whole vehicle instrument, the whole vehicle instrument displays the information that the pressure release of the high-pressure oil tank is completed and oiling is requested after receiving the pressure release completion signal, and when the pressure release of the high-pressure oil tank 3 is completed, the absolute value of the difference between the oil tank pressure and the atmospheric pressure is detected to be less than or equal to 2Kpa by the pressure sensor, the oil filler cap can be automatically unlocked, and manual oiling can be carried out after the oil filler cap is unlocked. The oil filler cap is the oil filler cap, when high-pressure fuel tank pressure is more than 2kpa, twist the key and can't pop out the oil filler cap spring bolt, and oil filler cap upper cover only can idle, can't open the oil filler cap, and when high-pressure fuel tank pressure is less than or equal to 2kpa, the oil filler cap can normally open.
S4, detecting the vehicle speed and judging the duration of the oiling process by the VCU; after oiling is completed, the VCU of the whole vehicle controller starts timing, and the vehicle speed is more than or equal to 5km/h and enters step S5; the speed of the vehicle is less than 5km/h, and the VCU of the whole vehicle controller continuously carries out manual refueling when judging that the duration time of the refueling process is less than 15 minutes; the speed of the vehicle is less than 5km/h, and the VCU of the whole vehicle controller judges that the duration time of the oiling process is more than 15 minutes and enters the step S5;
s5, measuring the oil quantity value V after oiling by using a whole vehicle instrument 2 The difference between the oil quantity value after oiling and the oil quantity value before oiling is calculated by the whole vehicle instrument to be the current added oil quantity value V f ，V f =V 2 -V 1 And V is combined with f The value of (2) is sent to the whole vehicle controller VCU and the engine control module ECU;
s6, judging the current added oil quantity value V of the whole vehicle instrument by the whole vehicle controller VCU and the engine control module ECU f Is a value of (2); currently added oil quantity value V f The value of (2) is larger than 5L, the VCU starts the engine to execute the carbon tank desorption program, and the step S7 is executed; currently added oil quantity value V f The value of (2) is less than or equal to 5L, the ECU controls the oil tank isolation valve to be closed, the VCU detects the power gear, the power gear is the ON gear and is not processed, the main relay is disconnected when the power gear is the OFF gear, and the oiling process is completed.
After the refueling is completed, the normal use process of the extended range light truck executes carbon tank desorption management and control according to the following method to prevent the saturated escape of the stored gasoline vapor of the carbon tank into the atmosphere, and specifically comprises the following steps:
s7, the VCU reads the current oil quantity signal of the whole vehicle instrument and compares the current oil quantity signal with the alarm oil quantity 5L; the carbon tank desorption program is started when the alarm oil quantity warning line reaches or exceeds 5L; step S8 is executed when the alarm oil quantity warning line 5L is not reached;
s8, an engine control module ECU collects signals of a pressure sensor and compares the signals with warning pressure P1; the pressure of the high-pressure fuel tank reaches or exceeds the warning pressure P1, and a carbon tank desorption program is started; step S9 is performed without reaching the guard pressure P1 of the high-pressure fuel tank; the warning pressure P1 is the opening pressure of a mechanical safety valve of the oil tank isolation valve;
s9, calculating the steam overflow quantity of the accumulated oil tank; the method comprises the steps of performing on-vehicle self-diagnosis system OBD detection on the oil tank isolation valve once in an accumulated manner, counting each time the oil tank isolation valve is opened, recording the accumulated times as N, wherein the accumulated times of the on-vehicle self-diagnosis system OBD detection on the oil tank isolation valve are represented by the accumulated times, the oil vapor overflowed from the oil tank when the oil tank isolation valve is opened is detected to be the maximum value B through a test, and accumulating the oil tank vapor overflow quantity S=N.B; and when the accumulated oil tank steam overflow quantity S is less than or equal to 70% of carbon tank adsorption working capacity and the engine works normally and the accumulated oil tank steam overflow quantity S is more than 70% of carbon tank adsorption working capacity, starting a carbon tank desorption program.
According to the universal characteristic of the engine, the carbon tank desorption program needs to select the working condition that the vacuum degree of the intake manifold of the engine is larger, and the air flow required by desorption of the carbon tank can be completely and cleanly achieved in a shorter time, and the carbon tank desorption program needs to be calibrated according to the actual vehicle condition.
Further, after the carbon tank desorption program is started, the whole vehicle instrument displays the working state of the carbon tank, and the carbon tank desorption work is continuously carried out until the desorption flow does not reach the flow threshold value of 500 BV; and when the desorption flow reaches the flow threshold value of 500BV, the engine resumes normal operation, and the whole vehicle instrument is closed for display.
Referring to fig. 3, in order to solve the problem that components of the extended-range light-card high-pressure fuel evaporation control system are insufficient in chassis mounting points and arrangement spaces, the invention relates to an integral module of a light-card extended-range light-card fuel evaporation system, which comprises: the high-pressure fuel tank 3, the carbon tank 13, the inflating pump 10, the carbon tank ash filter 9, the pressure sensor 23, the fuel filler pipe assembly 19 and the fuel filler cap 21. The above components are integrated into a single module and mounted on the chassis frame 15 by the left and right high pressure fuel tank bracket supports 2 and 6. The carbon tank 13, the inflating pump 10 and the carbon tank ash filter 9 can be ingeniously arranged on a bracket in a shape like a Chinese character 'ji' which is higher than the upper surface of the high-pressure fuel tank 3 on the left high-pressure fuel tank bracket arm bracket 2 through brackets, the pressure sensor 23 is integrated on an oil pump flange and is arranged on the high-pressure fuel tank 3 together with an oil pump through a lock ring, and the oil filling pipe and the oil filling cover 21 form a module with the high-pressure fuel tank 3 through the oil filling pipe mounting bracket 20 which is connected at the bottom of the left high-pressure fuel tank bracket arm bracket 2 in a threaded manner and extends upwards.
Referring to fig. 4, a schematic structure of the fuel filler cap 21 is shown, the lower cap 211 is installed inside the fuel filler tube assembly 19, the center of the bottom surface of the lower cap 211 is hollowed out, a pressure sensing diaphragm 212 is installed, the pressure sensing diaphragm 212 is always attached to the bottom surface of the lower cap 211 under the support of a return spring 213, the pressure inside the high-pressure fuel tank 3 is sensed, a cap-shaped valve core 214 is arranged on the outer ring of the return spring 213 and is fixed in the middle of the lower cap 211, a lock tongue 215 is arranged above the cap-shaped valve core 214 to limit the movement of the lock core 216, and the lock core 216 is fixed in the middle of the upper cap 217.
The filler cap 21 works on the principle that: when the internal pressure of the high-pressure fuel tank 3 is greater than 2kpa, the pressure sensing diaphragm 212 deforms to push the cap-shaped valve core 214 upwards, and covers the lock tongue 215, so that when the key is twisted, the lock tongue 215 cannot extend, the upper cover 217 cannot be locked with the lower cover 211, and can only idle, and at the moment, the fuel filler cap 21 cannot be opened.
When the internal pressure of the high-pressure fuel tank 3 is less than or equal to 2kpa, the return spring 213 pushes the cap-shaped valve core 214 to return, and when the key is twisted, the lock tongue 215 can normally extend to lock the lower cover body 211, so that the upper cover body 217 and the lower cover body 211 are locked, and the upper cover body 217 is rotated to drive the lower cover body 211 to rotate, and the fuel filler cap 21 is opened.
Referring to fig. 5, a schematic structural diagram of an integrated modularized extended range light-card fuel evaporation control system is shown:
the extended range light truck fuel evaporation control system comprises a left fuel tank strap 1, a left fuel tank bracket arm bracket 2, a high-pressure fuel tank 3, a first carbon tank adsorption tube 4, a right fuel tank strap 5, a right fuel tank bracket arm bracket 6, a fuel tank isolation valve 7, a second carbon tank adsorption tube 8, a carbon tank ash filter 9, an inflation pump 10, an inflation pump bracket 11, a vent tube 12, a carbon tank 13, a carbon tank bracket 14, a frame 15, a carbon tank desorption tube 16, an engine fuel supply tube 17, a filter 18, a fuel filling tube assembly 19, a fuel filling tube mounting bracket 20, a fuel tank cover 21, an oil pump conveying module 22 and a pressure sensor 23; the high-pressure fuel tank 3 is divided into an upper layer box type fuel tank and a lower layer box type fuel tank, a left fuel tank bracket support 2 is arranged on the left side of the bottom surface of the high-pressure fuel tank 3, a right fuel tank bracket support 6 is arranged on the right side, the left fuel tank bracket support 2 is fixed on a frame 15, and a filter 18 is fixed in the middle; one side of the filter 18 is connected with the oil pump conveying module 22 through an engine oil supply pipe 17, and the other end of the filter is an outlet of the engine oil supply pipe 17; the right fuel tank bracket arm bracket 6 is fixed on the frame 15, one side is provided with a fuel tank isolation valve 7, and the other side is provided with an inflating pump bracket 11; one side of the oil tank isolation valve 7 is connected with the second carbon tank adsorption pipe 8, and the other side of the oil tank isolation valve is connected with the oil pump conveying module 22 through the first carbon tank adsorption pipe 4; the second carbon tank adsorption tube 8 is connected with one end of the carbon tank 13; the carbon tank 13 is horizontally arranged on the carbon tank bracket 14, and the other end of the carbon tank 13 is connected with the inflation pump 10 through the vent pipe 12; a carbon tank desorption tube 16 is arranged below the carbon tank 13; the inflating pump 10 is arranged on the inflating pump bracket 11; the inflating pump bracket 11 is provided with an inflating pump 10 and a carbon tank ash filter 9 which forms an assembly with the inflating pump 10 through a quick connector; the carbon tank bracket 14 is fixedly connected to the left fuel tank bracket arm bracket 2 through bolts; the upper inner side of the left fuel tank bracket arm bracket 2 is fixed with a left fuel tank by a left fuel tank strap 1; the inner side of the right fuel tank bracket is fixed with a right fuel tank by a right fuel tank strap 5; the fuel tank cover 21 is connected with the outwardly protruding threaded interface of the fuel filling pipe assembly 19 through threads; the oil filler pipe assembly 19 is provided with an oil filler pipe mounting bracket 20 near the oil tank cover 21; the oil filling pipe mounting bracket 20 is L-shaped, one end of the oil filling pipe mounting bracket is fixed on the left fuel tank bracket arm bracket 2 through bolts, and the oil filling pipe assembly 19 is fixed at the other end of the oil filling pipe mounting bracket; a pressure sensor 23 is arranged below the high-pressure fuel tank (3).
Referring to fig. 6, a carbon tank 13, a carbon tank mounting bracket 14 and a right high-pressure fuel tank bracket 6 are integrally formed, the carbon tank 13 is fixed on the carbon tank mounting bracket 14 in a three-point constraint mode, the carbon tank mounting bracket 14 is fixedly connected with a bracket which extends 100mm on the frame 15 end of the left high-pressure fuel tank bracket 2 in a screw mode, a bolt is welded on the carbon tank mounting bracket 14, a nut is arranged in a groove which is shaped like a Chinese character 'ji' of the left high-pressure fuel tank bracket 2, and the carbon tank 13, the carbon tank mounting bracket 14 and the left high-pressure fuel tank bracket 2 form a whole.
Referring to fig. 7, a structural diagram is shown for installing the air pump bracket 11 and the left high-pressure fuel tank bracket arm bracket 2, the air pump 10 and the carbon tank ash filter 9 form a combined piece through a quick connector, and then the combined piece and the air pump 10 tube are fixed on the left high-pressure fuel tank bracket arm bracket 2 through the air pump bracket 11 in a screwed connection manner, and the combined piece is formed into a whole on a bracket which extends for 100mm on the frame 15. The inner shell of the carbon tank ash filter 9 is provided with a shutter air suction port, the air port is downward, and the chassis can be prevented from splashing and being dustproof. The carbon tank ash filter 9 and the inflating pump 10 are assembled and integrated together through the fast plug-in connector of the carbon tank ash filter 9 and the inflating pump 10, and a section of connecting pipeline of the carbon tank ash filter 9 and the inflating pump 10 can be reduced.
Referring to fig. 8, a mounting structure diagram of the fuel filler pipe mounting bracket and the bracket of the high-pressure fuel tank bracket is shown; the filler pipe assembly 19 is provided with a filler pipe mounting bracket 20 near the filler cup opening, so that the addition of mounting points of sheet metal and filler pipe openings on a container can be reduced; the oil filling pipe mounting bracket 20 is L-shaped, one end of the oil filling pipe mounting bracket is fixed on the left high-pressure fuel tank bracket arm bracket 2 through bolts, and the other end of the oil filling pipe mounting bracket is fixed on the oil filling pipe assembly 19.
The pressure sensor 23 is integrated on an oil pump which is mounted on the high-pressure fuel tank by a lock ring structure.
The carbon tank 13, the carbon tank mounting bracket 14, the carbon tank ash filter 9, the inflating pump 10 mounting bracket, the oiling pipe assembly 19 and the oiling pipe mounting bracket 20 are integrally mounted on the left high-pressure fuel tank bracket arm bracket 2 and the right high-pressure fuel tank bracket arm bracket 6 of the high-pressure fuel tank 3, the tank isolation valve 7, the oil pump conveying module 22, the pressure sensor 23 and the high-pressure fuel tank strap are integrally mounted on the high-pressure fuel tank 3, the carbon tank 13 adsorption pipe, the ventilation pipe 12 and the engine oil supply pipe 17 are integrally mounted on the filter 18, the whole fuel evaporation control and fuel storage conveying system is highly integrated, an integral module is formed, the requirement on the mounting point of the frame 15 is reduced to the greatest extent, and meanwhile, the whole system is compact, and a large arrangement space is saved. The modularized design can realize the whole general purpose of the straddle carrier, thereby reducing the development investment and the part cost of the system, the saved chassis arrangement space can be used for customizing and refitting the demands individually for clients, such as adding a tool box, a brake water tank, an sanitation car disc sweeping device and the like, and greatly improving the satisfaction degree of the clients.
The inflating pump 10, the carbon tank ash filter 9 assembly, the carbon tank 13 and the upper shell of the high-pressure fuel tank 3 need to keep a gap of 25-30mm so as to leave the installation and disassembly space of the left high-pressure fuel tank strap 1 and the right high-pressure fuel tank strap 5.
The inner shell of the carbon tank ash filter 9 is designed to prevent the chassis from splashing water and prevent dust from entering the air inlet of the shutter, and the air inlet faces downwards.
One end of the oil filling pipe mounting bracket 20 is fixed on the left high-pressure fuel tank bracket arm bracket 2 through a bolt, a nut is welded on the left high-pressure fuel tank bracket arm bracket 2, and the bolt is mounted from the bottom; the other end is fixedly provided with the oil filling pipe assembly 19 through a bolt and a nut, the nut is welded on a flange of the oil filling pipe assembly 19, and the bolt is arranged from top to bottom.
Referring to fig. 9, for an assembly diagram of a range-extended light-truck fuel evaporation system, a high-pressure fuel evaporation control system is highly integrated, a fuel filler cap is designed, the stable and reliable fuel filling process is ensured, the requirement for the mounting point of a chassis frame is reduced, and components such as a passenger car fuel filler door, a fuel filler door opening and closing mechanism, a fuel filler door opening and closing position sensor and the like are not needed.
In summary, the invention provides a range-extending type light-truck fuel evaporation system and a refueling control carbon tank desorption method, which utilize the vehicle speed to judge whether a refueling event is completed, are accurate and efficient, and simultaneously increase the refueling amount identification function, so that the carbon tank desorption requirement after refueling can be met, the risk of escape of refueling steam into the atmosphere is avoided, the carbon tank desorption frequency can be optimized, the energy is saved, and the range-extending type light-truck fuel evaporation system has the advantages of accuracy, high efficiency, safety, reliability, energy conservation and environmental protection, and can synchronously reduce customer complaints. The main hardware of the invention is a set of highly integrated high-pressure fuel evaporation control system, which not only reduces the demands on the mounting points of the chassis frame, but also does not need components such as a passenger car refueling small door, a refueling small door switching mechanism, a switching position sensor and the like, increases a fuel filler cap, saves the layout space of the chassis, improves the satisfaction of customers, and the modularized design realizes good generalization of a vehicle type platform, thereby saving investment and development cost.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes or direct or indirect application in the relevant art utilizing the present specification and drawings are included in the scope of the present invention.
Claims (5)
1. A method for desorbing a refueling control carbon tank of a range-extended light truck fuel vaporization system is characterized by comprising the following steps of: the method comprises the following steps:
s1, a cab gives a fueling instruction;
s2, an engine control module ECU detects whether the vehicle has a high pressure: if the whole vehicle does not have high pressure, the VCU sends a fuel filling prohibition signal to the whole vehicle instrument, and the whole vehicle instrument displays 'flameout is not performed and fuel filling is prohibited'; if the high voltage is pressed, the whole vehicle controller VCU is awakened by a hard wire, and meanwhile, the whole vehicle controller VCU actuation main relay wakes up the engine control module ECU and continuously transmits a refueling request signal to the engine control module ECU and the whole vehicle instrument until the whole vehicle controller VCU actuation main relay wakes up the engine management system EMS to transmit the refueling request signal to the engine management system EMS and the flow fault or the end of the whole vehicle instrument, and the whole vehicle instrument records the current fuel quantity value V 1 The ECU controls the oil tank isolation valve to open for pressure relief;
s3, an engine control module ECU detects an internal pressure signal of the fuel tank and starts timing for 10 seconds, and a prompt is given according to the current high-pressure fuel tank pressure whole vehicle instrument;
s4, detecting the vehicle speed by the whole vehicle controller VCU and judging the duration time of the oiling process; after oiling is completed, the VCU of the whole vehicle controller starts timing, and the vehicle speed is more than or equal to 5km/h and enters step S5; the speed of the vehicle is less than 5km/h, and the VCU of the whole vehicle controller continuously carries out manual refueling when judging that the duration time of the refueling process is less than 15 minutes; the speed of the vehicle is less than 5km/h, and the VCU of the whole vehicle controller judges that the duration time of the oiling process is more than 15 minutes and enters the step S5;
s5, measuring the oil quantity value V after oiling by using a whole vehicle instrument 2 The whole vehicle instrument calculates the current added oil quantity value V f And V is combined with f The value of (2) is sent to the whole vehicle controller VCU and the engine control module ECU;
s6, judging the current added oil quantity value V of the whole vehicle instrument by the whole vehicle controller VCU and the engine control module ECU f Is a value of (2); currently added oil quantity value V f The value of (2) is larger than 5L, the VCU starts the engine to execute the carbon tank desorption program, and the step S7 is executed; currently added oil quantity value V f The value of (2) is less than or equal to 5L, the ECU controls the oil tank isolation valve to be closed, the VCU detects the power gear, the power gear is the ON gear and is not processed, the main relay is disconnected when the power gear is the OFF gear, and the oiling process is completed;
s7, the current added oil quantity value V f The value of the fuel quantity is larger than 5L, and the VCU of the whole vehicle controller reads the current fuel quantity signal of the whole vehicle instrument and compares the current fuel quantity signal with the alarm fuel quantity of 5L; the carbon tank desorption program is started when the alarm oil quantity warning line reaches or exceeds 5L; s8, executing the step of not reaching the warning line of the alarm oil quantity;
s8, an ECU (electronic control unit) of the engine control module collects signals of a pressure sensor and warning pressure P 1 Comparing; the pressure of the high-pressure fuel tank reaches or exceeds the warning pressure P 1 Starting a carbon tank desorption program; does not reach the warning pressure P of the high-pressure fuel tank 1 Executing step S9; warning pressure P 1 Opening pressure for a mechanical safety valve of an oil tank isolation valve;
s9, calculating steam overflow quantity of the accumulated oil tank; and when the accumulated oil tank steam overflow quantity S is less than or equal to 70% of carbon tank adsorption working capacity and the engine works normally and the accumulated oil tank steam overflow quantity S is more than 70% of carbon tank adsorption working capacity, starting a carbon tank desorption program.
2. The method for desorbing the fueling control carbon tank of the extended range light truck fuel vaporization system of claim 1, wherein the method comprises the steps of: in the step S3, the prompt given by the pressure whole vehicle instrument of the current high-pressure fuel tank includes: displaying a prompt that the high-pressure fuel tank is depressurized, and after 10 seconds, if the pressure in the high-pressure fuel tank is more than 2kpa, reporting a fuel tank depressurization fault by an engine control module ECU and displaying the high-pressure fuel tank depressurization fault on a whole vehicle instrument, wherein maintenance is requested; if the pressure in the high-pressure fuel tank is less than or equal to 2kpa, the whole vehicle instrument displays that the pressure relief is finished and the fuel is filled, and at the moment, a fuel filler cap can be opened for manual fuel filling.
3. The method for desorbing the fueling control carbon tank of the extended range light truck fuel vaporization system of claim 1, wherein the method comprises the steps of: in the step S6, the current added oil quantity V f For the value V of the oil quantity after refueling 2 And the current oil quantity value V 1 The difference of (1) is the current added oil quantity value, and satisfies V f =V 2 -V 1 。
4. The method for desorbing the fueling control carbon tank of the extended range light truck fuel vaporization system of claim 1, wherein the method comprises the steps of: in the step S9, the vapor overflow amount of the accumulated fuel tank satisfies the following formula:
S=N·B
in the above formula: s represents the steam overflow quantity of the accumulated oil tank;
n represents the accumulated opening times of an on-board self-diagnosis system OBD detection oil tank isolation valve;
b represents the maximum value detected by the test when the tank isolation valve opens the oil vapor overflowed from the tank.
5. The method for desorbing the fueling control carbon tank of the extended range light truck fuel vaporization system of claim 1, wherein the method comprises the steps of: after the carbon tank desorption program is started, the whole vehicle instrument displays the working state of the carbon tank, and the carbon tank desorption work is continuously carried out until the desorption flow does not reach the flow threshold value of 500 BV; and when the desorption flow reaches the flow threshold value of 500BV, the engine resumes normal operation, and the whole vehicle instrument is closed for display.
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| KR20130011752A (en) * | 2011-07-22 | 2013-01-30 | 현대자동차주식회사 | Apparatus for evaporative gas process of vehicle and control method thereof |
| CN114320674A (en) * | 2020-09-30 | 2022-04-12 | 株式会社电装 | Fault diagnosis device for leak diagnosis device |
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| US10766757B2 (en) * | 2018-12-06 | 2020-09-08 | Ford Global Technologies, Llc | Method and system for vehicle refueling |
| CN209539471U (en) * | 2019-02-19 | 2019-10-25 | 江铃汽车股份有限公司 | A kind of hybrid vehicle EVAP Evaporative System leakage diagnostic device |
| CN114060163A (en) * | 2020-07-30 | 2022-02-18 | 比亚迪股份有限公司 | Fuel leakage detection method and system and vehicle |
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| KR20130011752A (en) * | 2011-07-22 | 2013-01-30 | 현대자동차주식회사 | Apparatus for evaporative gas process of vehicle and control method thereof |
| CN114320674A (en) * | 2020-09-30 | 2022-04-12 | 株式会社电装 | Fault diagnosis device for leak diagnosis device |
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