JPS58119924A - Supercharge pressure controller for engine - Google Patents

Abstract

PURPOSE:To reduce the smoke density by controlling the supercharge pressure in a supercharger on the basis of the smoke density in the exhaust gas. CONSTITUTION:An exhaust turbine 10 is rotated by the exhaust pressure to rotate a suction blower 8 thus to feed the supercharge pressure to an intake manifold. Upon increase of the smoke density under predetermined operating condition, the output signal from an amplifier 28 will change from L1 to L2 while the output from a comparator 34 will change from B to C. Then a solenoid valve 34 will function to open a discharge port 42 to lower the pressure from a compressor section 12 functioning on an actuator 23 thus to move a diaphragm 25 to the left of fig. 1 and to close a west gate valve 24.

Description

DETAILED DESCRIPTION OF THE INVENTION More specifically, the present invention relates to an engine supercharging pressure control device that controls supercharging pressure according to the smoke concentration in exhaust gas.

In a supercharged engine, when the amount of fuel supplied is increased to cope with high-speed, high-load operation, there is a problem in that the smoke concentration of the exhaust gas increases accordingly.

In order to solve the above problem, conventionally, JP-A @ sb-10
In the f/J$ publication, the degree of smoke in the exhaust gas is detected, and the detection signal is used to control a control valve device installed in a fuel passage connected to a fuel injection valve to correct the fuel injection timing and injection period. A smoke limiting device for an internal combustion engine has been proposed, which suppresses the amount of smoke generated to a predetermined value or less.

Furthermore, conventionally, in Japanese Unexamined Patent Application Publication No. 1989-13, a turbocharger is disclosed in which exhaust gas from an internal combustion engine drives a turbine and a compressor via the turbine to supercharge air to the internal combustion engine. A senna that detects the air condition II, a bypass that guides the exhaust gas of the internal combustion engine around the turbine, and a bypass valve that is provided in the middle of this bypass and opens and closes the bypass according to a signal from the sensor. A turbocharger consisting of the following has been proposed.

The present invention treats the above-mentioned conventional collision as a ship, and by controlling the supercharger supply pressure by smoke II) 11 in the exhaust gas, the smorph concentration is reduced compared to the conventional one. The purpose of this device is to provide an engine O supercharging pressure control device, which is characterized by its configuration. In a fuel-charged engine, a supercharging pressure control means for controlling supercharging pressure, a smoke detector for detecting smoke peak concentration in exhaust gas, and supercharging when the smoke detector detects a high smoke concentration. A control circuit is provided for operating the supercharging pressure control means so that the pressure increases. Since the present invention is configured as described above, it is possible to control the supercharging pressure of the supercharger depending on the degree of swell exchange in the exhaust gas, thereby obtaining the effect of reducing the smoke concentration compared to the past. I can do it.

Embodiments of the present invention will be described below based on the drawings.

The engine O supercharging pressure control device 1 of the first embodiment includes a supercharger 2
and a control circuit 4. The supercharger 2 includes an intake blower 8 attached to one end of a shaft 6, and an exhaust turbine 101 attached to the other end. The downstream passage of the compressor section 12 having the intake proar 8 is communicated with the intake manifold 16 of the engine 14, and the exhaust manifold 1g of the F9 engine 14 is communicated with the turbine 20 having the exhaust turbine 10 and the waste dirt passage 22. be done. A waste pulp 24 connected to an actuator 23 controlled by the control circuit 4 is disposed in the waste dirt passage 22. The downstream passage of the turbine section 200 and the downstream of the waste dirt passage 22 are merged. It is later communicated with a muffler (not shown), and in the passage 3 downstream of the above-mentioned merging position, a peak-crossing 26 is disposed.

The control circuit 4 includes an amplifier 28 connected to the smoke sensor 26KIIi, a triangular wave oscillation@30, and a non-inverting input to the amplifier 28.
The inverting input is connected to a triangular wave oscillator 30II, which is connected to nine comparators 32, and is connected to the comparators 32 and consists of nine renoid valves 34. The solenoid valve 34 is arranged in the middle of a connecting arm 36 that connects the downstream passage of the compressor section 12 of the supercharger 2 and the actuator 2s. Furthermore, the solenoid valve 34 opens its discharge port 42 by the output of the comparator @32, and the compressor part 12 acts on the actuator 23.
A portion of the output boost pressure is released to the upstream passage of the compressor 1112.

The triangular wave oscillator 30 outputs a triangular wave 40 shown in FIG. The comparator 32 outputs a rectangular wave Pl shown in FIG. 2 11 when the output voltage of the amplifier 28 is L as shown in FIG. λ, and outputs a rectangular wave Pl shown in FIG. Output P2. Since the rectangular wave P2 remains open for a long time when energized, the rectangular wave P2 opens the discharge port 42 of the solenoid valve 34 more widely and acts to lower the output supercharging pressure of the compressor section 12 that acts on the actuator 23. .

In the above configuration, the exhaust turbine 10 is rotated by the exhaust pressure, and the intake prower 8 is also rotated, so that supercharging pressure is sent to the intake manifold 16. The exhaust pressure acting on the exhaust turbine yiotc is regulated by 1llFjK of the wastegate pulp 24, which is actuated by the actuator 23, which is controlled by the boost pressure and the control circuit 4.

When the smoke density increases under the above-mentioned constant operating conditions, the output signal of the amplifier 1128 changes from L in Figure λ^ to L dew, and the output of comparison @34 changes from Figure λ B to GK in Figure 2. do. As a result, the solenoid valve 34 operates the discharge port 42 in a large manner, and acts on the actuator 21; As the pressure from the Lena l112 decreases, the diaphragm 25 moves to the left in FIG.
is closed. Then, the exhaust pressure acting on the exhaust turbine 10 increases and the rotational speed of the exhaust turbine 10 and the intake proar 8 increases, and the supercharging pressure increases and the intake air amount of the engine 14 increases, resulting in incomplete combustion of fuel. decreases, and the peak density decreases.

The second example is shown in jlI3all, but the same components as in the example are given the same reference numerals, and 70*mei is omitted. Attach the center piece 521krllr to the actuator 230 connecting rod 50, and attach the microphone switch 54 to the main body of the actuator 23C. As for the microphone, the switch 54 detects the operation of the wastegate
-28, when the waste date valve 24 is closed, the protrusion 52 turns off the microswitch 54t and the relay 56. As a result, even if the smoke sensor 26 outputs a detection signal, it is not input to the control circuit 4, and the detection signal is not input to the control circuit 4.
can improve the durability of

In the third embodiment, as shown in the figures, a KID valve 64 is disposed upstream of an intake blower 62 of a supercharger 60, and a smoke sensor 68 is disposed downstream of an exhaust turbine 66. The smoke sensor 8 is connected to a control circuit 70 which is the same as the control circuit 4 of the iris embodiment, and the control circuit 70 is connected to the solenoid valve 2.
connected to.

The solenoid valve 72 is arranged in the middle of the Δig 73 that communicates the downstream side of the intake proar 62 and the actuator 74,
The valve is opened by energization from the control circuit 70 and the supercharging pressure is applied to the actuator 74 . When the boost pressure acts on the actuator 74 to a large extent, the spring 76
The diaphragm 78 moves to the right in the figure against this. As a result, the obliquely installed throttle valve 64 moves in the direction (
As a result, the supercharging pressure increases, the amount of intake air in the engine increases, the incomplete combustion of fuel decreases, and the fuel concentration decreases. .

The second embodiment is a so-called Miller cycle engine in which the intake valve is closed before the dead center of the piston during the intake stroke. K111m1 is used to delay the closing timing of the intake valve when

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the unexploded @IIo building/example, Fig. 2 is a signal waveform diagram of the first practical example, Fig. 3 is an explanatory diagram of the λth embodiment,
The irises are explanatory diagrams of the third embodiment. DESCRIPTION OF SYMBOLS 1... Boost pressure control device, 2... Supercharger, 4... Control circuit, 8...@Intake proa, 10... Exhaust turbine, 12... Fungusa part, 14-11... engine,
16ψ...Intake manifold, 18@...Kogo seast manifold, 22...Wastegate passage, 34...Solenoid valve Ichifu Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] In a supercharged engine that supplies supercharging air to the engine using a steel plate with an intake air turbine, a supercharging pressure control means for controlling the supercharging pressure and a smoke concentration R' in the exhaust gas are provided.
and a control circuit that operates the supercharging pressure control means so that the supercharging pressure increases when the smoke detector detects a high smoke concentration.
- Boost pressure control device for engines that are susceptible to mold.