CN101804781B - PHEV generator set capable of recycling fuel steam and accessories thereof - Google Patents

Abstract

The invention discloses a PHEV generator set and its accessories, which include a fuel steam pipe, a throttle body and an intake manifold, a carbon tank solenoid valve is vertically arranged on the engine body, and the air inlet below it is connected The steam pipe coming from the outlet is connected to the fuel steam pipe interface at the front end of the intake manifold, and a stepper motor is installed on the throttle valve body to control the engine working speed and idle speed. Turn on/off the carbon canister solenoid valve at the speed after startup to introduce fuel vapor into desorption combustion. The invention utilizes the mature oil supply technology and fuel vapor recovery technology of traditional automobiles, rationally continues to use the parts of the original vehicle's oil supply system, optimizes the layout design of the oil supply system, and realizes a mature non-vehicle generator set with as little modification cost as possible It is integrated into the PHEV vehicle to ensure the accurate and safe fuel supply of the fuel supply system and realize the purpose of recovering fuel vapor at the same time.

Description

A PHEV generator set and accessories for recycling fuel vapor

technical field

The invention belongs to the field of plug-in rechargeable hybrid electric vehicle PHEV (Plug-in Hybrid Electrical Vihicle), and particularly relates to the technology for the integration of a generator set for a hybrid electric vehicle and a complete vehicle, and the recovery and utilization of fuel vapor in the fuel supply system of the complete vehicle and emission control.

Background technique

As a representative of new energy vehicles, electric vehicles have the advantages of economy and cleanliness. However, due to the problems of relatively small energy and slow upgrade of batteries at this stage, the use of more battery packs will be limited by the layout space and load capacity of the vehicle. Electric vehicles at this stage have the problem of insufficient driving range. In order to increase the mileage of electric vehicles before the battery energy ratio bottleneck is broken through, it is necessary to consider adding a mileage extension system (mileage extender) with a generator set (small engine plus generator) as the main body to realize the mileage after the battery energy is too low increase. The small engine is no longer used as the driving power source of the vehicle, and the main function of the engine is to drive the generator to generate electricity. Within the pure electric design mileage, pure electric operation without fuel consumption is realized. When the operating mileage exceeds the battery design mileage, the drive motor uses the electric energy generated by the generator set to drive the vehicle. More and more automobile factories will take the plug-in rechargeable system into consideration when developing hybrid and electric vehicles. Pure electric vehicles and plug-in hybrid systems based on pure electric vehicles have become a trend.

However, some PHEVs with batteries as the main power source are limited by their own design power performance indicators. At the same time, it is limited by the development cycle, so the generator set will consider the solution of using a mature non-automotive single-cylinder engine or a horizontally opposed engine plus a generator integrated into the vehicle. The oil supply system of these generator sets did not consider the recovery and combustion of fuel vapor, that is, there is only an oil inlet system without a fuel vapor recovery device. If it is directly integrated, it is obviously inconsistent with the concept of energy conservation and environmental protection advocated by PHEV, and it is also for the whole vehicle. The requirements of emission regulations are not tolerated, so when the corresponding fuel supply system is integrated with these generator sets, there will be problems of fuel vapor recovery and utilization.

As shown in Figure 1, the power battery pack used in PHEV is located above the mid-bottom plate 13 and the rear bottom plate 12. After the fuel filter 6 is filtered, part of it flows into the fuel tank again through the oil inlet and return pipes, and part of it passes through the second oil inlet pipe 8 through the mid-bottom plate 13 and the front bottom plate to the engine fuel injection port of the generator set in the front cabin and is controlled by the ECU to supply fuel. The direction of the fuel vapor generated inside the fuel tank is: through the first fuel vapor pipe 5 to the carbon tank, from the second fuel vapor pipe 3, to the bottom plate 13 and connected to the third fuel vapor pipe 9 through a pipe joint. The layout design of the oil supply system described in this figure is similar to that of a traditional car. The problem is that the fuel supply system of the generator set used by the mileage booster is not for vehicles, and there are no carbon canisters, fuel vapor pipelines, carbon canister solenoid valves and other devices used for fuel vapor recovery. Its control unit GPU (generator set control unit) ) does not need to consider fuel vapor desorption combustion control. Therefore, when the third fuel vapor pipe 9 described in Fig. 1 is led to the front cabin, there is a problem of how to connect with the generator set and how to control the fuel vapor combustion by the ECU after integration. The accurate and reasonable setting of the interface involves the modification of the generator set body and the collection of negative pressure, while the control of the desorption and combustion of fuel vapor involves the rewriting of the ECU control program.

As shown in Figure 2, the oil supply system of the existing generating set only has the oil inlet pipe 23 connecting the fuel tank and the fuel injection port 22, and an idle speed control valve 18 is set on the engine body in order to control the idle air intake. Its air outlet pipe 21 is connected on the throttle body connected with the intake manifold 29 . Accurately setting the fuel vapor interface on the throttle body or the intake manifold can effectively use the negative pressure to allow the fuel vapor to be introduced into the desorption combustion after the solenoid valve is turned on.

Contents of the invention

The invention provides a PHEV generator set and accessories for realizing the recovery and utilization of fuel vapor, in which a small generator set is restructured and integrated into the whole vehicle to match the fuel supply system components of the whole vehicle in order to meet the emission requirements of the whole vehicle.

The invention specifically discloses a generator set and accessories for PHEV, including a fuel steam pipe, a throttle valve body and an intake manifold. A carbon tank solenoid valve is vertically arranged on the engine body, and the air inlet below it is connected from the carbon tank. The fuel steam pipe brought in, the steam pipe at its outlet is connected to the fuel steam pipe interface at the front of the intake manifold, and a stepper motor is installed on the throttle valve body to control the engine working speed and idle speed, and the ECU passes the detection Turn on/off the carbon canister solenoid valve at the speed after the engine starts to introduce fuel vapor into desorption combustion.

Wherein, the control signal line and the power line of the carbon canister electromagnetic valve (24) are respectively passed through the plug-in leads at its lower end to the ECU and the small power supply wire harness of the engine.

Wherein, a bracket is arranged on the engine body inside the engine cooling cover, and the carbon canister solenoid valve is vertically fixed on the bracket. The bracket is located at the corner of the cylinder body and the cooling cover.

Wherein, the fuel vapor pipe interface is arranged at the front end of the intake manifold and the rear end of the throttle body.

Further, under the action of its inverter, the generator set transmits the load request signal to the stepper motor to control the throttle opening of the engine, thereby controlling the normal working speed and idle speed of the engine.

Further, the carbon canister electromagnetic valve controls the fuel vapor in the small fuel tank of the generator set to be collected and stored from the carbon canister and then introduced into the engine through the fuel vapor pipe for desorption and combustion.

The characteristics of the present invention are: using the mature oil supply technology and fuel vapor recovery technology of traditional automobiles, reasonably continuing to use the parts and components of the original vehicle oil supply system, optimizing the design scheme of the oil supply system layout, and realizing mature non-alcoholic fuel oil with as little modification cost as possible. The vehicle generator set is integrated into the PHEV vehicle to ensure the accurate and safe fuel supply of the fuel system and realize the function of the mileage increaser at the same time.

The present invention is also characterized in that it uses a stepping motor to control the throttle valve body of the generating set to replace the idle speed control valve of the original generating set, controls the opening of the throttle to ensure the working speed under normal load, and realizes the control of idle air intake, while generating The intake manifold of the unit engine is equipped with a reasonable fuel vapor introduction desorption interface, and the purpose of recovering fuel vapor is achieved through the control of the carbon canister solenoid valve by slightly changing the original generator set ECU control program.

Description of drawings

Figure 1: The layout of the parts of the oil supply system under the rear floor of the existing vehicle;

Figure 2: The composition diagram of the generator set system before the integration of the existing vehicle;

Fig. 3: Front view of the composition of the generator set system after the vehicle integration of the present invention;

Fig. 4: A top view of the composition of the generator set system after the vehicle integration of the present invention.

Explanation of reference signs:

1-Metal refueling pipe; 2-Refueling hose

3-Second fuel vapor pipe; 4. Carbon canister breather pipe;

5-The first fuel steam pipe; 6-Fuel filter;

7- the first oil inlet pipe; 8- the second oil inlet pipe;

9-the third fuel steam pipe; 10-small fuel tank;

11-power battery pack; 12-rear floor;

13-Middle base plate; 14-Cylinder head of generator set engine;

15-generator body; 16-radiation cover;

17-air filter; 18-idle speed control valve;

19-air filter intake pipe; 20-intake pipe;

21-air outlet pipe; 22-fuel injection port;

23-Oil inlet pipe; 24-Carbon canister solenoid valve;

25-Fuel steam pipe in the front cabin; 26-Fuel steam pipe interface;

27-stepper motor; 28-throttle body rear end face;

29 - Intake manifold.

Detailed ways

The present invention will be specifically described below in conjunction with the accompanying drawings.

As shown in Figures 3 and 4, the design of the existing generator set system is improved, and the canister solenoid valve 24 is vertically arranged at the original idle valve position, specifically at the corner of the cylinder block 15 and the heat dissipation cover 16 inside the engine heat dissipation cover. A bracket is arranged on the engine body, and the canister solenoid valve 24 is vertically fixed on the bracket. The control signal line and the power line of the carbon canister electromagnetic valve 24 are respectively passed through the plug-in leads at the lower end to the ECU and the small power supply wire harness of the engine. The third fuel vapor pipe 9 described in FIG. 1 is introduced into the air inlet of the carbon canister electromagnetic valve 24 through the fuel vapor pipe 25 in the front compartment, and the opening of the desorption of the fuel vapor in the carbon canister is guaranteed under the control of the ECU; A stepper motor 27 is integrated on the throttle body, and under the action of the inverter for the generator set, the load request signal is transmitted to the stepper motor to control the throttle opening of the engine so as to achieve the purpose of controlling the idle speed of the engine in normal operation , the front end of the intake manifold 29 and the rear end of the throttle body are provided with a fuel vapor pipe interface 26, which is connected to the outlet of the carbon canister solenoid valve 24 through the fuel vapor pipe, and the ECU can be turned on and off by detecting the engine speed Carbon canister solenoid valve 24, so that the fuel vapor in the small fuel tank 10 is collected and stored from the carbon canister and introduced into the engine for desorption and combustion through the third fuel vapor pipe 9 and the front compartment fuel vapor pipe 25.

Claims (7)

1. A generating set for plugging in a rechargeable hybrid electric vehicle, comprising a fuel vapor pipe, a throttle valve body and an intake manifold, characterized in that: a carbon canister solenoid valve (24) is vertically arranged on the engine body, The air inlet below it is connected to the fuel vapor pipe (25) leading from the carbon tank, and the steam pipe at its outlet is connected to the fuel vapor pipe interface (26) at the front end of the intake manifold. The motor (27) is used to control the working speed and idle speed of the engine. The ECU detects the speed after the engine is started to conduct/close the carbon canister solenoid valve to introduce fuel vapor into desorption combustion. 2. The plug-in rechargeable hybrid electric vehicle generator set according to claim 1, characterized in that: the control signal line and the power line of the canister solenoid valve (24) are respectively connected to the ECU and the engine through the plug-in leads at the lower end thereof Small power harness. 3. The plug-in rechargeable hybrid electric vehicle generator set according to claim 1 or 2, characterized in that: a support is set on the engine body inside the engine cooling cover, and the carbon canister solenoid valve (24) is vertically fixed on on the bracket. 4. The plug-in rechargeable hybrid electric vehicle generator set according to claim 3, characterized in that: the bracket is located at the corner of the cylinder body (15) and the heat dissipation cover (16). 5. The plug-in rechargeable hybrid electric vehicle generator set according to claim 4, characterized in that: the fuel vapor pipe interface (26) is arranged at the front end of the intake manifold and the rear end of the throttle body. 6. The plug-in rechargeable hybrid electric vehicle generator set according to any one of claims 1, 2, 4 or 5, wherein the generator set transmits the load request signal to Give the stepping motor (27), control engine throttle opening, thereby control the rotating speed, idle speed of engine normal work. 7. The generator set for a plug-in rechargeable hybrid electric vehicle according to any one of claims 1, 2, 4 or 5, characterized in that: the carbon canister solenoid valve (24) controls the small fuel tank for the generator set The fuel vapor in (10) is collected and stored from the carbon tank and introduced into the engine through the fuel vapor pipe for desorption and combustion. the

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