The way of filling the supply system of internal combustion engine

 

(57) Abstract:

The described way of filling the supply system of the internal combustion engine in which the fuel pump is controlled from the control unit. If the control unit depending on the measured values will find that should be filling with fuel, then it controls the fuel pump so that before starting the internal combustion engine is already achieved sufficient padding. If, on the other hand, the control unit detects a normal start, that is the normal way to control the fuel pump. Switching from the temporary control of the fuel pump in the normal control is also depending on the detected conditions of the interrupt. The invention allows to reliably fill the fuel circuit of the engine without having to start internal combustion engines, and in the case of an accident the fuel supply quickly terminated, preventing the involuntary leakage. 5 C.p. f-crystals, 2 Il.

The invention relates to a method of filling the supply system of internal combustion engine according to the restrictive part of the main claim.

In power systems engine fuel pump with electric drive is usually controlled using a control unit. When the engine is started the fuel pump runs as long as the control unit is not compulsory scheme prevents the supply of fuel with the ignition on and the engine off, for example, after the accident.

After repair or installation of the injection system in the vehicle fuel circuit of the engine must be re-filled. This filling should be done without starting the internal combustion engine to prevent damage to the catalyst by the incomplete combustion to the beginning of the combustion. Since, however, should be avoided over long-term operation of the fuel pump without starting engine or operating the internal combustion engine, so that when you crash to eliminate the leakage of large quantities of fuel, for example, from the ruptured fuel lines, you must prevent this mode of operation. In addition, such a restriction operation mode is chosen so that when the ignition is switched on to prevent accidents, for example, an unattached fuel lines after repair of the fuel path.

The objective of the invention is to implement both contradictory in themselves requirements: desired long pump for filling the loop and short time work in normal mode, without the need for complex intervention in the control system of the engine.

The method according to the invention with the characteristics of p. 1 formula has the advantage that a reliable filling of the fuel circuit of the internal combustion engine is achieved without the heart and soul of the pump and at the same time, during an accident the fuel supply quickly terminated, preventing the involuntary leakage.

These advantages are achieved due to the fact that the controller, which manages the fuel pump with electric drive, on the measured values, for example the rotational speed of the internal combustion engine, the rotation angle of the throttle valve, the position of the ignition switch, determines whether there is a normal start or should be filling power of the engine.

Additionally ask are whether the engine temperature and the temperature of the intake air in the same and a certain range (e.g. 20 - 30oC).

Depending on this the preferred way control device or implements the normal management of the fuel pump, or temporary control of the pump. This is a temporary management may be particularly preferred way interrupted by the control unit when the occurrence of specified conditions, and may transition to the normal operation of the fuel pump.

By estimating the position of the throttle can be implemented unambiguous conditions, with which the control device can reliably detect what the system is no longer possible.

Other advantages of the method according to the invention is achieved by the measures specified in the dependent claims.

The invention is illustrated by drawings, showing:

In Fig. 1: block diagram of power supply system of internal combustion engines, including the means according to the invention for registering the operational state; Fig. 2: diagram of the voltage-time for various signals.

In Fig. 1 schematically necessary for the emergence of the invention the components of the power system of the engine. When this POS. 10 identified control device, i.e., for example, the vehicle control unit. This control unit 10 controls among other things and the fuel pump 11 with the actuator, and the control is using the relay 12 pump, one output of which is connected to terminal B+ of the battery.

The control unit serves information from sensors or other measuring devices. As sensors or measuring devices, which, however, does not have to attend all specified: sensor 13, which measures the angle of rotation DK throttle sensor 14 speed, advanced sensor 17, the engine temperature and the sensor 18, the temperature of the intake air, any extra is mcnut or shorted ignition switch z

Registered sensors or voltmeter data served to the control unit 10 and processes for managing or regulating the internal combustion engine, such as ignition or injection, and the control unit 10 sends a signal to the input of A. Next, depending on the supply of information or the recorded operating parameters, the control unit 10 supplies the input B control signals for the relay 12, which connects the fuel pump 11 to the direction or disables from him.

In Fig. 2 shows the signals that are important for the understanding of the invention. These signals are the voltage characteristics depending on time t. In particular, depicts the signal at terminal Kl, 15, which measure, on or off the ignition switch. This signal is denoted by S1, S2 denotes the output signal of the sensor 13. It is low, if the angle DK below the limit value, and high if above.

The signal S3 speed low to start the internal combustion engine at the time t3, and the signal S4 representing the control signal for the pump 11 which is supplied by a control unit 10, low when the pump is switched off and high when enabled.

Is depicted in Fig. 2 characteristics of the signals occur when the control unit has detected that we are talking about filling carmelina management, moreover, some criteria of transition are described below in more detail.

The described method is being tested, therefore, only when the control unit was re-established, or if there has been a blurring of adaptation values, i.e., when the so-called initial start-up. This initial start-up is carried out after any major repair injection system.

The distinction between the desires of the driver of the charging circuit or the normal start-up occurs in the control unit by estimating the position and movement of the throttle. If you have turned the ignition, the throttle is opened widely, for example on the corner DK 80ofirst runs normal pump operation, lasting about t1 = 1c. In Fig. 2t1 means the beginning of the deviation of the throttle. By the time 2 ignition switch is closed, and simultaneously the first time closes the relay 12.

If, for example, after one second ( t1) throttle valve remains open (signal S2 remains high), then after a certain period of time t2 there is a further, longer pump control, lasting about 20 s, and is shown in Fig. 2 t3. This time is sufficient in order to be fulfilled the following conditions: rotational speed n=0 and DK>80obefore to the terminal Kl, 15 is the applied voltage. In addition, you can set condition: the engine temperature TILOthe temperature of the intake air TANS. Next would be the detection of the initial start, and then the applied voltage to the terminal Kl, 15. Only when all these conditions is temporary management of the fuel pump.

Another criterion of the beginning of interim management can be detected is if the rotation angle of the throttle zero after a specified period of time after operation of the pump.

Improvements of this method can be achieved by the fact that the driver after the first operation of the pump once to completely close and reopen the throttle, so that it is detected by the desire to fill the system. Arise then the characteristic of the signal S2 is indicated by the dashed line, and the period of time during which the throttle valve is closed, labeled t4. Due to the noise of the fuel pump mechanics in the workshop or on the conveyor is easy to install temporary ratio of movement of the throttle.

In certain circumstances, for example if cha is whether the ignition switch is opened, there is a transition to the normal operation of the fuel pump or off.

The transition from interim management to the normal operation of the fuel pump after the time t3, i.e., when starting acceleration, occurs when the normal start. Other criteria interrupt function in the event of a defect or accident.

If the control unit detects that the fill is not required, and should proceed with normal operation, it does not start temporary management of the fuel pump, and immediately proceeds in a normal mode of operation in which, however, the pump lasts for about one second, however, the following management occurs only after the discovery of the increasing speed at the time t3.

The signals S1 or S2 can prematurely be low, leading to temporary interruption control the fuel pump. Characteristics of the signals depicted by the dashed line, and the corresponding conditions interrupt labeled Ab1 and Ab2.

1. The way of filling the supply system of the internal combustion engine using a fuel pump operated by a control device, and means for registration use asselineau valve, the ignition switch or speed, wherein when the management of the fuel pump distinguish normal start-up and filling of the power system and this difference is exercised by the managing device, based on the registered operational conditions.

2. The method according to p. 1, characterized in that the temperature of the engine and/or air temperature must lie within a certain range to detect the desired filling fuel system.

3. The method according to p. 1, characterized in that upon detection of a desire to fill the system activate the temporary management of the fuel pump, which, prior to starting the internal combustion engine further includes a fuel pump on a defined period of time.

4. The method according to p. 2, characterized in that the detection speed is above zero, the control unit starts the transition to the normal operation of the fuel pump.

5. The method according to p. 1, characterized in that when detecting that the voltage UKL.15at terminal Kl.15, corresponding to the ignition switch becomes low or that the DK angle of rotation of the throttle valve becomes less than the specified threshold value, the control unit SG terminates the provisional upravleniia system further filling of the system is excluded, the result is further activated temporary management of the fuel pump.

 

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