JPS6050225A - Turbosupercharged engine with intercooler - Google Patents

Abstract

PURPOSE:To secure an air charging state suitable for a state of engine operation, by controlling an on-off valve inside an intercooler by means of an input signal of one side or both of eingine speed and load. CONSTITUTION:A signal 15 out of an engine speed sensor and a signal 16 cut of a load sensor bot are inputted into a control unit 14. When both on-off valves 12 and 13 come into a state of being opened, flow passage resistance in an intercooler 4 is small. When these on-off valves 12 and 13 are close, increment in an air charging quantity is checked whereby charging temperature is dropped. In time of opening or closing these on-off valves 12 and 13, these operations are made to correspond to that of a waste gate device.

Description

DETAILED DESCRIPTION OF THE INVENTION In a turbocharged engine, it is desirable to provide an intercooler between the turbo blower and the engine in order to lower the temperature of the air supply supplied to the engine by the turbo blower and increase suction efficiency.

The present invention departs from the conventional concept of a turbocharged engine with an intercooler, in which the intercooler is simply used to cool intake air, and instead directs a portion of the exhaust gas to the exhaust pipe without passing through the exhaust turbine when the engine is running at high speed and under high load. The present invention will be explained with reference to the drawings as follows.

In the figure, (1) is an engine, (2) is a turbo supercharger, (3) is an air cleaner, and (4) is an intercooler. The present invention is characterized by the intercooler (4) and its control system.

A large number of heat exchange conduits connecting the upper tank (51) of the intercooler (4) and the lower tank (6) are connected to the partition wall +71.
+81 + 91 tJ (j 01
It is separated into 1. In the illustrated case, the number of partition walls is two and the number of conduit groups is two, but these numbers can be increased as appropriate. Separating the heat exchange conduits as described above allows them to be operated in parallel or in series, or in a combination of parallel and series, to control the amount of charge air supplied to the engine in relation to the increase or decrease in flow path resistance. This is to do so. In order to perform this control, in the illustrated case where the number of partition walls is 2 and the number of conduit groups is 6, one on-off valve [+a f+31] is provided in each of the upper tank (5) and lower tank (6). At the same time, these on-off valves f12 and f+31 are operated synchronously by the control device (141).
01 is entered. One of these signals +151 fll can be omitted. The operation of the on-off valve +IZ f+31 may be either an on-off type or a continuous type, but from the viewpoint of simplifying the structure, it is preferable to adopt an on-off type.

Figure 1 shows a state where the flow path resistance of the intercooler (4) is small because the on-off valve (IZ + I31 is in the open state).
FIG. 2 shows a state where the flow path resistance of the intercooler (4) has increased because the on-off valve f+21+131 is in the closed state.

The point at which the state shown in FIG. 1 shifts to the state shown in FIG. 2 approximately corresponds to the point at which the wastegate device is operated in an engine provided with the wastegate device. FIG. 6 shows the amount Q of air supply supplied to the engine and the temperature T of the air intake in relation to the state of the on-off valve (Ie f+31). As shown in this figure, when the on-off valve f+303 is closed,
The increase in the supply air amount Q is suppressed and the supply air temperature T is lowered.

In the illustrated example, the number of partition walls is two and the number of on-off valves is one set. "Closed" →
[The first set of on-off valves and the second set of on-off valves are closed”...
It is also possible to gradually increase the length of the cooling flow path through which the supply air passes.

As clarified in the above description, the present invention enables a turbocharged engine with an intercooler to control an intercooler to provide an air supply state that is adapted to the operating state of the engine.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of a turbocharged engine with an intercooler according to the present invention, FIG. 2 is a diagram showing the engine shown in FIG. 1 in a different state, and FIG. It is a graph diagram for explaining the state shown in FIG.

Claims (1)

[Claims] A large number of heat exchange conduits in the intercooler are separated into at least six groups of conduits by a plurality of partition walls, and the plurality of conduit groups among the conduit groups are connected in series by being moved to a closed state. Opening/closing valves forming flow paths through which the supply air flows are provided in the supply air inflow side tank and outflow side tank of the intercooler, and the opening/closing valves are provided in the supply air inflow side tank and the outflow side tank of the intercooler, and the above opening/closing valve is set using one or both of the engine rotation speed and the load as an input signal. A turbocharged engine with an intercooler, characterized by being equipped with a control device that controls opening and closing of valves.