JPS60147533A - Suction air-cooling device for engine fitted with intercooler - Google Patents

Abstract

PURPOSE:To prevent a suction air from being excessively cooled particularly when an engine is run under lighter load, whereby eliminating the chance of incomplete combustion, by providing a secondary cooling water supplying line to an intercooler with a cooling water supplying bypass line and further providing these lines with a flow rate regulating valve. CONSTITUTION:In an engine equipped with an intercooler 2, a cooling water supplying bypass line 13 is provided at a secondary cooling water supplying line 5 to the intercooler 2, and these lines 5, 13 are provided respectively with flow rate regulating valves 9, 10. Further provided are a means for detecting the loaded condition of engine 3, for example, a temperature sensor 11 for detecting the temperature of suction air flowing through an air duct 4 and a controller 12 adapted to actuate respective valves 9, 10 in response to a signal from the temperature sensor 11. When the engine is operated, for example, under a small load, the valve 9 is closed and the valve 10 is in turn opened, and thereby throttling the flow of cooling water passing to the intercooler 2 to prevent a suction air from being excessively cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charge air cooling device for an engine with an intercooler.

FIG. 1 shows a configuration diagram of a conventional supply air cooling device.

1 is a cooling water pump, 2 is an inotar cooler, 3 is an engine, 4 is an air duct, 5 is a cooling water, 6 is intake air for the engine, 7 is a turbocharger, and 8 is an exhaust gas.

Cooling water is constantly passed through the intercooler 2 regardless of the load on the engine 3. For this reason, the intake air 6 supplied from the turbocharger 7 is constantly cooled by the intercooler 2, so when the engine is under low load, the intake air 6 is cooled more than necessary, resulting in poor combustion or an increase in white smoke. There is a problem that can lead to this.

An object of the present invention is to eliminate the drawbacks of the conventional device and prevent overcooling of engine intake air by restricting water supply to the intercooler when the engine is under low load or idling.
An object of the present invention is to provide an engine charge air cooling device with an intercooler that prevents poor combustion and the generation of white smoke.

An embodiment of the charge air cooling system for an engine with an intercooler according to the present invention will be described below with reference to FIG.

Figure 2 shows an application of the present invention to a tarp charger engine (hereinafter referred to as an engine with intercooler) that cools supercharged air with external cooling water. 1 is a cooling water pump, 2
3 is an intercooler, 3 is an edge/(includes the so-called primary cooling system and heat exchanger that cool the engine cylinder jacket, etc., not shown), 4 is an air duct, 5 is a secondary cooling water line, 6 is an air supply, and 7 is a turbo. Charger, 8 is exhaust gas, 9 is flow rate adjustment valve A (on/off type, but adjustable type),
lO is flow rate adjustment valve B (on-off type or adjustable type), 11
12 is a temperature sensor that detects the temperature of the supply air flowing in the air duct 4, and 12 is a flow rate adjustment valve A9 that receives a signal from the temperature sensor 11.
, a controller for operating the BIO, 13 a secondary cooling water air cooler bypass line, and 14 a signal transmission line.

Next, the operation of the above embodiment will be explained.

When engine 3 is operating under high load, the flow regulating valve A
9 open (or large opening) and close the flow rate adjustment valve BIO (
The cooling water sent from the cooling water pump 1 as a cooling water opening rate (opening rate) is sent to the intercooler 2 via the secondary cooling water 5 and sent to the heat exchanger of the engine 3, etc.

When the engine 3 is under low load and the ambient temperature drops, the air supply 6 sent from the turbocharger 7 is cooled by the intercooler 2 and supplied to the ennon 3 through the air duct 4, but the air temperature is good. Temperature sensor 1 detects this as the temperature drops below the temperature required for combustion.
Controller] sends a signal to 2. This controller]2
through the signal transmission line 14, closes the flow rate adjustment valve A9 (or opens the opening rate), opens the flow rate adjustment valve B1.0 (or increases the opening rate), and throttles (or cuts) the cooling water sent to the intercooler 2. ) Prevent the supply air from being supercooled. At this time, cooling water is supplied to the engine 3 through the pinox line 13.

In addition to the supply air temperature, the load can also be determined based on the exhaust temperature, the cooling water temperature, etc.

As described above, the charge air cooling device for an engine with an intercooler according to the present invention includes a bypass cooling water supply line attached to a secondary cooling water supply line to the intercooler, and a bypass cooling water supply line attached to the secondary cooling water supply line to the intercooler in a turbochart engine with an intercooler. A flow control valve A and a flow control valve B provided in the cooling water supply line and the piping line, respectively, a means for detecting the load state of the engine, and a signal from the means to control the flow control valves A and B. The controller is configured to throttle flow control valve A and open flow control valve B at low loads, and open control valve A and throttle B at high loads, so that when the engine is under high load, the engine In addition to ensuring high output through cooling, the supply air is appropriately cooled during low loads to prevent combustion from worsening and unburnt gas, HG gas white smoke, etc. from being discharged, resulting in good combustion. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional device, and FIG. 2 is a block diagram of a charge air cooling device for an engine with an intercooler according to the present invention. 1 Engine, 2...Interface 7.5.Secondary cooling water supply line to intercooler, 7.Turbochart, 9..Control valve A, 10..Control valve B, 11..Detection of engine load Means, 12... Controller, 13
Bypass cooling water supply line.

Claims (1)

[Claims] In turbocharged Yani/Jin with intercooler,
Secondary cooling water supply line (5) to intercooler (2)
The flow rate control valves A (9) and B (1) installed in the cooling water supply line and the pipe gas line, respectively, and the engine load condition A controller θa that controls the flow rate control valves A and B according to a signal from this means.
A charge air cooling system for an engine with an intercooler, which is configured to throttle control valve A and open control valve B when the load is light, and to open control valve A and throttle control valve B when the load is high.