JPS58158365A - Fuel supply control device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve the efficiency of a motor driven pump by an arrangement wherein the amount of injection of fuel is controlled in proportion with the amount of fuel fed by a motor driven pump for pressurizing. CONSTITUTION:A pump control means 15 adapted to control a motor driven pump 6 in accordance with a signal from a control device 5 arranged to control the amount of injection of fuel in such a manner that the number of revolutions of the pump 6 is kept in proportion with the amount of fuel injected by a fuel control valve 2. This arrangement enables the number of revolutions of the motor driven pump 6 to be increased or reduced in accordance with the amount of injection of fuel and the pump 6 to be operated without wasting energy whereby operating it always efficiently.

Description

[Detailed description of the invention] The present invention relates to a fuel control device for an internal combustion engine.

A conventional fuel control system for an internal combustion engine is shown in FIG.

In the figure, 1 is an internal combustion engine, 2 is a fuel control valve that injects internal combustion engine IK fuel, 3 is an air amount sensor that detects the total intake air amount to the internal combustion engine 1, and 4 is a temperature sensor for the cooling water of the internal combustion engine 1. A water temperature sensor 5 for detecting is a control device 6 that calculates the required fuel t required by the internal combustion engine 1 based on the signals from the air amount sensor 3 and the water temperature sensor 4, and controls the opening and closing of the fuel control valve 2 according to the result. 4 for fuel pressurization with electric motor 6af
Nzo, 7 is switch 8t? A battery s9 connected to the electric motor 6a via a fuel tank, 10 a pipe provided between the pump 6 and the fuel tank 9, 11 a pressure regulator connected to the 4-in f6 via a pipe 12', Pipes 13 and 14 connect the pressure regulator 11 to the fuel tank 9 and fuel control valve 2, respectively.

In the conventional device having the above configuration, when the internal combustion engine 1 is operating, the switch 8 is closed by a signal from the control device 5, and is connected to the electric motor 6aU battery 7 to rotate. As a result, Ponzoro is driven and the fuel in the fuel tank 9 is transferred to the pipe 1.
0.12 to the pressure regulator 11, and the fuel is further supplied to the fuel control valve 2 via the pipe 14. The pressure regulator 11 keeps the pressure of the fuel supplied to the fuel control valve 2f constant, and excess fuel is returned to the fuel tank 9 via the pipe 13. On the other hand, the control device 5 calculates the required amount of fuel for the internal combustion engine 1 based on the signals from the air amount sensor 3 and the water temperature sensor 4, and controls the opening and closing of the fuel control 92 to inject this required amount of fuel. As a result, as shown in FIG. 2, the amount of fuel injected from the fuel control valve 2 is proportional to the intake air of the internal combustion engine 1.

When the control signal from the control device 5 to the fuel control 9P2 is a 7 pulse width modulation signal, the on/off duty ratio for opening and closing the fuel control valve 2 is proportional to the intake air amount.

However, in the conventional device described above, the full voltage of the battery 7 is applied to the electric motor 6a that drives the pump 6 via the switch 8, and since the pump 6 is of a constant displacement type, the electric motor 6a is controlled by the fuel injection amount of the fuel control ff2. Regardless, it is always operated at full load, and surplus fuel is returned to the fuel tank 9 from the pressure regulator 11 through the pipe 13. Therefore, as shown in FIG. 3 (7), the current consumption of the electric motor 6a, which normally has DC shunt characteristics, remains constant regardless of the fuel injection amount, and the smaller the fuel consumption, the more efficient the pump 6, including the electric motor 6a'gt. decreases.

Furthermore, since unnecessary fuel is returned from the pressure regulator 11 to the fuel tank 9, there is also a drawback that the @ temperature of the fuel increases unnecessarily.

The present invention has been made in consideration of all the above points, and an object of the present invention is to provide a fuel control device for an internal combustion engine that can improve the efficiency of an electric pressurizing engine.

Embodiments of the present invention will be described below with reference to drawings. - In FIG. 4, 15 is a pump control device provided between the electric motor 6a and the battery 7, and the pump control device 15 receives a control signal corresponding to the control signal applied from the control device 5 to the fuel control valve 2. is applied from the control device 5, and thereby the applied voltage to the electric motor 6a is fully adjusted to control the rotational speed of the electric motor 6a to be proportional to the fuel injection amount of the fuel control valve 2. The other configurations are the same as before. The voltage applied to the motor 6a is adjusted by continuously varying the applied voltage or by varying the average value of the applied voltage using pulse width control. Figure 5 shows an example of pulse width control, and Figure 5 (
A) is a control signal applied from the control device 5 to the fuel control valve 2, and FIG. 5 @ is a control signal applied from the pump control device 15 to the electric motor 68 in response to the control signal shown in FIG. TO line noggle period, Ta and To are pulse widths, vB
The average voltage applied to the electric motor 6aK is (Tb/To) x VB, and the rotational speed of the electric motor 2a having DC shunt characteristics is proportional to this average voltage.

Also, Ta represents the opening time of the fuel control valve 2, and - represents T.
TaVc may be set to have the same time width as a, or may be set to a unique value approximately proportional to TaVc in consideration of a dead zone with respect to the applied voltage resulting from the characteristics of the electric motor 6a, transient increase correction of the fuel injection amount, etc. By controlling the electric motor 6af in this way, the consumption type & of the electric motor 6a that burns the fuel injection lid is the third
As shown in Figure (a), the voltage is almost proportional, and the electric motor 63 is given sufficient applied voltage to pressurize the required amount of fuel, and is capable of efficient operation for all types of fuel injection. . In addition, the return of fuel from the pressure regulator 11 to the fuel tank 9 can be reduced to '', and a rise in fuel temperature can be suppressed.

Further, the pump control device 15 can be provided with characteristics as shown in FIG. That is, the voltage vB of the battery 7
In this case, the duty ratio (''/To) of the control signal from the 4-pump controller 15 to the motor 6a is increased. The voltage applied to 6a (”
/'r, )x VB is compensated so that it is not affected by fluctuations in the battery voltage Vn, and the discharge amount of the bonder 6 is prevented from fluctuating due to fluctuations in the battery voltage due to fluctuations in the rotational speed of the motor 6a.

The fuel control valve yf-2 may be controlled by either intermittent injection or continuous injection, and the fuel control valve 2 is installed at the internal combustion engine 1.
It may be provided in any of the intake systems.

Further, an intake pipe negative pressure sensor may be used in place of the % nitrogen amount sensor 4, or a rotational speed sensor for detecting the rotational speed of the internal combustion engine 1 may be used.

As described above, in the fuel control device for an internal combustion engine according to the present invention, the electric pump is connected between the electric pump and its drive power source in response to a signal from the control device that controls the total amount of fuel injection. A four-ring control device is installed to control the rotation speed so that it is proportional to the fuel injection amount of the fuel control valve, and this allows the rotation speed of the electric bonder to be increased or decreased depending on the magnitude of the required fuel injection amount. Electric pumps can always operate efficiently without wasting energy.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional device, Figs. 2.3 are characteristic diagrams of the conventional device and the device according to the present invention, Fig. 4 is a schematic configuration diagram of the device of the present invention, and Fig. 5 is a schematic diagram of the device according to the present invention. Control signal waveform diagram for the fuel control valve and electric bonder in the device related to
FIG. 6 is a characteristic diagram of the device according to the present invention. 1... Internal combustion engine, 2... Fuel control valve 53... Air l sensor %4-Water temperature sensor, 5... Control device %6...
・Electric Bonde s 6 a...Electric motor, 7.../?
9...Fuel tank, 15...Pump control device. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuken - 1l1 Figure 2 tlIJs Figure 4 Figure 5 Figure 6

Claims (3)

[Claims] (1) A fuel control valve that injects pressurized fuel into the internal combustion engine by an electric two-wheel engine, and a fuel control valve that injects the required amount of fuel in response to a signal from a sensor that detects the operating state of the internal combustion engine. A control device that controls the opening and closing of the electric pump, and a control device that controls opening and closing of the electric pump according to a control signal from the control device, and a control device that controls the opening and closing of the electric pump and a power supply for driving the electric pump. A pump control device that splits the sides proportionally? A fuel control device for an internal combustion engine, characterized by comprising: (2) The fuel control device for an internal combustion engine according to claim 1, wherein the pump control device is configured to generate an output sound that compensates for voltage fluctuations of the drive power source. (3) The pump control device is configured to output a pulse width modulation signal whose duty ratio is increased in accordance with a voltage drop of the drive power source. Fuel control device for internal combustion engines.