JPS5999028A - Air injecting apparatus for use in diesel engine with turbocharger for supplementing lack of air - Google Patents

Abstract

PURPOSE:To improve accelerating performance of an engine and to prevent generation of black smoke, by providing an on-off valve which is opened transiently for a prescribed while when an accelerator pedal is depressed rapidly at a portion of a passage extended between a compressed-air tank and a compressed- air injecting port which is opened when an intake valve is opened. CONSTITUTION:A compressed-air injecting port 8 which is opened when an intake valve 6 is opened is formed in a valve seat 7 of the intake valve 6, and an on-off valve 4 which is opened transiently for a prescribed while when an accelerator pedal is depressed rapidly is provided at a portion of a fluid passage 3 extended between the injection port 8 and a compressed-air tank 2. When the intake valve 6 is opened, air is injected through the valve seat 7 for supplementing lack of air caused transiently when the accelerator pedal is depressed rapidly. Here, in case that a depression signal 11 of the accelerator pedal has exceeded a prescribed value, the on-off valve 4 is opened by a computer 5 for a prescribed while corresponding to the pedal depressing speed. With such an arrangement, it is enabled to make a boost compensator unnecessary.

Description

[Detailed Description of the Invention] A boost compensator installed in a turbocharged diesel engine adds control according to boost pressure to control of the fuel pump control rack, and control of the control rank is performed by the governor, control lever, and boost compensator. This will be carried out by three parties.

In a turbocharged diesel engine equipped with a boost compensator (hereinafter referred to as an engine with a boost compensator), the control rack adjusts the boost pressure when the accelerator pedal is depressed rapidly, and therefore the control lever is rapidly rotated. Since the control rack reaches the position corresponding to the rotational position of the control rack after it has risen, there is no generation of black smoke caused by an excessive amount of fuel being supplied. This is an advantage of engines with a booster, but there is a criticism that engines with a booster have poor acceleration performance. This is because we expect this engine to have the acceleration performance of a non-supercharged engine with the same output as this engine, and the lack of force that is said about engines with a boost controller is due to the operating function of the boost compensator itself. It can be said that it is a thing.

The present invention is aimed at eliminating the need to install a boost compensator in a turbocharged engine and also preventing deterioration of exhaust color during sudden acceleration. In the case of an engine, a system for introducing compressed air to the valve seat of an intake valve is shown, and FIG. 2 shows the structure in the vicinity of the valve seat of the intake valve.

In Figure 1, (1) is the cylinder head, (2) is the compressed air tank, (3) is the flow path from the compressed air tank (2) to the valve seat of the intake valve, and (4) is the flow path provided on this flow path. The electromagnetic on-off valve (5) is a computer that controls the opening and closing of the electromagnetic on-off valve (4) by inputting the depression speed of the accelerator pedal. Figure 2 shows the above elements as well as the intake valve (6), the valve seat (7) of the intake valve, the air inlet (8) provided on the valve seat (7), and the annular groove on the valve seat (7). (9) and the compressed air passage 00) in the cylinder head (1).

The air that is blown in when the intake valve (6) is opened via the valve seat (7) of the intake valve (6) is for so-called supercharging, and when the accelerator pedal is depressed rapidly. This is to correct the shortage of air supply that occurs transiently.

The computer (5) switches the electromagnetic on-off valve (4) when the accelerator pedal depression signal (11) that has arrived at the computer (5) exceeds a predetermined value.
) is opened for a predetermined time (for example, about 5 to 10 seconds) depending on the pressing speed. Note that when the intake port 021 is a helical port, the air inlet (8) is set in the flow direction of the swirl created by the helical port.

There are also differences in the degree of rapid depression applied to the accelerator pedal, and the shortage of air supply caused by a delay in the operation of the turbocharger also changes according to the above-mentioned difference, so the electromagnetic on-off valve (4) (generally speaking The time period during which the channel opening/closing valve (flow path opening/closing valve) is kept open is changed according to the memory set in the computer (5). Since diesel engines are intended to be operated with as low an air excess ratio as permissible, the time during which the solenoid on-off valve (4) is kept open is such that this condition is not compromised and the exhaust gas is It is defined along a line that prevents color deterioration from occurring.

The device according to the invention described above achieves the above-mentioned purpose while supplying insufficient air at the intake valve seat at the end of the flow path from the blower of the turbocharger to the combustion chamber of the engine. This does not affect the flow direction of the supply air flowing through the intake port 021.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an air blowing device according to the present invention, and FIG. 2 is a sectional view showing the structure near the intake valve seat in the device shown in FIG.

Claims (1)

[Claims] When the acceleration vehicle/L is rapidly stepped on the flow path between the compressed air intake port and the compressed air tank, which opens at the valve seat of the intake valve and opens when the intake valve is open. 1. A device for blowing insufficient air into a diesel engine equipped with a turbocharger, characterized in that a flow path opening/closing valve is provided which is transiently opened for a predetermined period of time.