JPS6036728A - Supercharging pressure controlling apparatus - Google Patents

Abstract

PURPOSE:To prevent emission of blue and while smoke, by preventing temperature rise of supercharging air by by-passing exhaust gas from a turbine when the temperature of supercharging air supplied to the side of an intake manifold becomes higher than a prescribed value. CONSTITUTION:When the supercharging pressure reaches a prescribed level, an actuator 19 is operated to open a pipe 15 by a valve 17. Resultantly, the amount of exhayst gas supplied to a turbine 2 is reduced and the speed of rotation of the turbine 2 is lowered to keep the supercharging pressure at a constant level. On the other hand, when the temperature of supercharging air becomes higher than a prescribed level, an electromagnetic solenoid 20 is energized and a valve 18 is opened, so that the exhaust gas by-passes the pipes 15, 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharging pressure control device, and particularly to a supercharger equipped with an intercooler.

Generally, the supercharger cools the supercharged air from the turbine side by driving a turbine based on the exhaust pressure of the engine's exhaust gas, compressing air with the turbine, and supplying this compressed air to the engine's intake manifold. A device equipped with an intercooler is known (Japanese Utility Model Publication No. 57-42121).

According to this, since the temperature of the supercharged air is lowered, the heat load on the engine is reduced, non-king can be prevented, the compression ratio can be increased, and the supercharging pressure can also be increased. Therefore, engine output is improved, leading to improved torque, especially in the low speed rotation range. It also prevents abnormal combustion,
The generation of harmful substances in flue gas can be suppressed.

However, in the conventional supercharger mentioned above, when the intercooler is made large for the purpose of increasing the cooling capacity of the intercooler, the intercooler occupies a narrow space in the car, and this reduces the size and weight of the car. It becomes an obstacle when trying to achieve this goal. Therefore, the cooling capacity of the intercooler has a certain limit. Therefore, as the car runs at high speed, the exhaust gas passes through the high-temperature 1'M reintercooler to the engine (Jt).The temperature of the supercharged air increases, so installing an intercooler cannot be expected to have much of an effect. Not only that, but there was also the risk of emitting blue-white smoke when accelerating.

The first object of the present invention is to suppress the supercharging pressure of the supercharging air when the temperature of the supercharging air supplied to the engine via the intercooler becomes higher than a predetermined level, and [by suppressing the rise in .] This is to eliminate the first drawback, and will be explained in detail below using Examples.

1 and 2 are simplified configuration diagrams showing one embodiment of the boost pressure control device according to the present invention. In each figure, 1 is an engine, and the exhaust gas discharged through the exhaust manifold of this engine is shown in FIG. The air cleaner 4 is driven by the blower 3 which is coaxial with the turbine 2.
The supercharged air is compressed and introduced into the engine 1 via an intercooler 6 inserted into an intake manifold 5.

The intercooler 6 has a cooling water pipe, and a radiator 9 is connected to an outlet pipe 7 and an inlet pipe 8 of the water pipe. Water in the intercooler 6 is sent to and circulated to the intercooler 6 by a pump 11 driven by a motor 10, thereby cooling the intercooler 6. In this case, the radiator 9 is air-cooled by the fan 12.

In this case, connect the exhaust manifold IA to the exhaust pipe IB.
A bypass device 13 is provided between the two.

This bypass device 13 is an exhaust manifold IA.
It consists of a pipe 14 extending from the exhaust pipe IB and a pipe 15.16 extending from the exhaust pipe IB and connected to the pipe 14, and a valve 17.18 facing the open end of the pipe 15.16.゜18 from the pipe 14 side to the pipe 15
．． 16 (1'J). The above-mentioned valves 17 and 18 are respectively controlled by actuators 19 and 20. The actuators 19 are known and control the amount of the supercharged air led to the intake manifold. In other words, when the supercharging pressure of the supercharging air reaches a predetermined value, the valve 17 opens the open end of the pipe 15 to reduce the amount of exhaust gas supplied to the turbine 2 side. to reduce the rotational speed of the turbine 2 and keep the boost pressure constant (see characteristic P in Figure 3).The actuator 20 has the configuration of the present application, for example, is constituted by an electromagnetic solenoid, and when excited, the actuator 20 operates the valve 18. When opened, part of the exhaust gas is guided from the pipe 14 to the pipe 16 to the 7 exhaust pipe IB, thereby suppressing the rotation speed of the turbine 2 and keeping the supercharging pressure constant as shown in characteristic F in Figure 3. The electromagnetic solenoid of this actuator 20 is
It is controlled by the control circuit shown in the figure.

In FIG. 4, 40 is a supercharging temperature detection switch;
As shown in FIG. 1, it is installed on the side wall of the intake manifold 5, for example, and is turned on when the temperature of the supercharged air sent from the intercooler 6 side to the intake manifold side exceeds a predetermined temperature.One end of this switch 40 is Air conditioner switch 41. It is connected to a power source 43 via an ignition switch 42, and the other end is connected to a selector switch 44.
-6- is connected to the movable contact 44C. The above changeover switch 44
The movable contact 44C is linked to, for example, the accelerator, and when the automobile is in an accelerating state, the movable contact 44C switches to the fixed contact 44a side, and when the vehicle is running at a constant speed, it switches to the fixed contact 44b side. The fixed contact 44a is connected to the base side of a transistor 48 that controls a relay 47 via resistors 45 and 46, and the fixed contact 44b is connected to the base side of the transistor 48 via a resistor 49. Note that the connection point between the resistors 45 and 46 is grounded via a capacitor SO. Contact 47C turned on by excitation of the relay 47
is connected to the electromagnetic solenoid 20. A transistor 52 is connected to this control circuit, which turns on when the supercharging temperature detection switch 40 is on and lights up the display 51, and also turns on when the supercharging temperature detection switch 40 is off. The relay 53 is energized, and this contact 53C
The transistor 5 turns on and excites the electromagnetic clutch 54.
5 is connected. Note that the transistor 55 is controlled by a transistor 56, and when the supercharging temperature detection switch 40 is turned on and this transistor 56 is turned on, the transistor 55 is set to off, thereby deactivating the electromagnetic clutch 54. The compressor is turned off.

In the configuration described above, when the air introduced into the intercooler 6 side becomes high in temperature, for example, when a car is driven for a long time, the supercharged air supplied to the intake manifold 5 side is sufficiently cooled by the intercooler 6. When the temperature of this air exceeds a predetermined level, the supercharging temperature detection switch 40 provided on the side wall of the intake manifold 5 is turned on. Here, assuming that the air conditioner switch 41 is on and the vehicle is running at a constant speed, the movable contact 44c of the changeover switch 44 is not switched to the fixed contact 44b side. The transistor 42 is turned on and the display 51 lights up, thereby informing that the temperature of the supercharged air has reached a predetermined level or higher. Therefore, the driver can take measures such as slowing down the vehicle.

Further, the transistor 48 is turned on, the relay 47 is energized, and the contact 47c is turned on, so the electromagnetic solenoid 20 is energized and the valve 18 is opened, so that the exhaust gas is transferred to the pipe 15.1.
A portion of the air flows into the exhaust pipe IB via the bypass of No. 6, thereby suppressing the rotational speed of the turbine 2, so that the amount of air supplied to the intercooler 6 side can be reduced. Therefore, the temperature of the supercharged air passing through the intercooler 6 can be lowered, and the problem that occurs when the supercharged air reaches a high temperature higher than a predetermined level, that is, the generation of blue-white smoke, can be prevented. There is no possibility that the effect of providing 6 will be lost. Further, when the supercharging temperature detection switch 40 is turned on, the transistor 56 is turned on and the transistor 55 is turned off, so that the electromagnetic clutch 5
4 and the compressor is turned off, the load on the engine can be reduced and the temperature rise of the supercharged air can be more effectively suppressed.

When the automobile is in an accelerating state and the movable contact 44c of the changeover switch 9-44 is switched to the fixed contact 44a side, when the supercharging temperature detection switch 40 is turned on, the supercharging temperature detection switch 40 is turned on. After a certain period of time has elapsed, the charging voltage of the capacitor 50 reaches a predetermined value, the transistor 48 is turned on, the valve I8 is opened, and the supercharging pressure is suppressed. Therefore, since the supercharging pressure is not suppressed during acceleration, there is no problem in accelerating the vehicle. In other words, when accelerating, the boost pressure is suppressed only when accelerating for a certain period of time (until the charging voltage of the capacitor reaches a predetermined value). It does not cause any hindrance when passing.

In this case, since it is displayed in advance by the display 51, the driver can predict that the supercharging pressure will be suppressed, and can also protect the engine by interrupting acceleration.

Note that in this embodiment, the display 51 is turned on, but a buzzer or the like may be sounded. It also detects the temperature on the surface side of the evaporator that is cooled by the compressor, compares this temperature with the set temperature, and when this temperature reaches the set temperature, the compressor is turned off and the set temperature is set. Completion when it becomes Hiro l-
In a device equipped with a thermoswitch circuit that turns on, when the supercharging temperature detection switch is turned on, the set temperature of the thermoswitch circuit can be adjusted to a predetermined level to reduce the operating rate of the combustible 1/soza. good. Also, if the compressor is of a variable capacity type, the capacity may be reduced. Further, the cooling capacity of the intercooler 6 is increased by driving the radiator fan 12 by the supercharging temperature detection switch 40.
, you may do so.

Also, during acceleration, the supercharging temperature detection switch 40
Although it has been explained that the valve 18 opens after a certain period of time has elapsed since the engine was turned on, the valve 1B is not opened during acceleration driving, but only opens the valve I8 during constant speed driving to increase the boost pressure. It may be suppressed.

As explained above, according to the supercharging pressure control device according to the present invention, "supercharging air adjustment" that controls the displacement amount in the pipe that bypasses a part of the JJI air supplied to the turbine side of the supercharger is performed. , detects the temperature of the supercharged air supplied from the supercharger to the engine intake manifold via the intercooler, and operates when this temperature exceeds a predetermined temperature to control the supercharged air adjustment means. and a supercharging temperature detecting means to suppress the supercharging pressure when the temperature of the supercharging air sent to the intake eyebrow pole 1' side reaches a predetermined temperature range 1- by the manual supercharging temperature detecting means. Therefore, it is possible to prevent the temperature of the supercharged air from rising, thereby preventing the generation of blue-white smoke and protecting the engine.

[Brief explanation of the drawing]

FIGS. 1 and 2 show the boost pressure control device according to the present invention.
FIG. 3 is a characteristic diagram for explaining its operation, and FIG. 4 is a circuit diagram showing an embodiment of the supercharging pressure control device according to the present invention. I...Engine, 2...Turbine, 3...Blower, 6...Intercooler, 9...Radiator, 20...
... Electromagnetic solenoid, 40 ... Supercharging temperature detection switch, 41 ... Air conditioner switch, 42 ... Ignition switch, 44 ... Changeover switch, 51 ... Display, 54 ... Electromagnetic clutch. Patent applicant: Diesel Kiki Co., Ltd. Agent Patent attorney: Jun Miyazono - -13- Figure 1 and (110 Figure 2)

Claims (1)

[Claims] +11 Boost pressure adjusting means for adjusting the displacement in a pipe that bypasses a part of the exhaust gas supplied to the turbine constituting the supercharger, and Detects the temperature of the supercharged air supplied to the intake manifold side of the engine, and operates when this temperature reaches a predetermined temperature.
A supercharging pressure control device comprising supercharging temperature detecting means for controlling the supercharging pressure adjusting means to suppress an increase in supercharging pressure. (2) The supercharging pressure control device according to claim 1, further comprising an alarm means that lights up or sounds in response to a signal from the supercharging temperature detection means. (3) The supercharging pressure control device according to claim 1, further comprising compressor control means for reducing the operating rate of the compressor based on the output signal from the supercharging temperature detection means. (4) The supercharging pressure control device according to claim 1, further comprising fan control means for driving or increasing the speed of a fan for cooling the intercooler based on an output signal from the supercharging temperature detecting means. (5) A supercharging pressure adjustment means that adjusts the displacement in a pipe that bypasses a part of the exhaust gas supplied to the turbine that constitutes the supercharger, and a supercharging pressure adjusting means that bypasses a part of the exhaust gas that is supplied to the turbine that constitutes the supercharger, and the intake manifold side of the engine from the supercharger to the intercooler. detects the temperature of the supercharged air supplied to the
A supercharging temperature detecting means for controlling the supercharging pressure adjusting means to suppress an increase in supercharging pressure; 1. A supercharging pressure control device comprising acceleration determining means that stops operation or stops for a certain period of time.