JPH09195777A - Coolant injector for intercooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively conduct cooling according to the operational status of an engine without interfering the operation of the driver when an air cooling intercooler for a supercharger is cooled by injecting coolant. SOLUTION: By turning on the automatic mode switch 44, if the engine operational status matches to a setting condition a relay 46 is turned on by a trigger signal output from the ECU 50 to input the trigger signal to a timer unit 45 to automatically inject cooling water, and when the driver turns on a manual mode switch 43 during automatic mode stand-by, the manual mode overrides to input trigger signal to the timer unit 45 to perform water injection to the intercooler 13. This allows the cooling performance of the intercooler to be effectively improve, without bothering driving operation as well as water injection may be enabled by the driver's decision, to accommodate to any circumstances from the starting to operational status in a simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercooler cooling medium injection device for cooling an air-cooled intercooler of a supercharger.

[0002]

2. Description of the Related Art In recent years, a supercharger such as a turbocharger has been adopted for a naturally aspirated engine, and it is possible to greatly improve the output performance by supplying fresh air with a higher density to the engine. became. When adopting this supercharger,
In many cases, an intercooler for cooling the supercharged air is provided between the supercharger and the engine body to prevent a decrease in efficiency due to a rise in temperature of the intake air.

For example, in Japanese Utility Model Publication No. 60-18225,
A technique is disclosed in which the cooling capacity of an intercooler is increased by injecting a cooling medium toward a radiator of a water-cooled intercooler arranged between a turbocharger and an engine body.

[0004]

Conventionally, in order to inject the cooling medium into the intercooler, there is a method in which a switch provided around the driver's seat is operated and the injector is operated at the discretion of the driver. In the injection of the cooling medium by such a manual operation, the injection cannot be performed at an appropriate timing with respect to the operating state of the engine, and it is difficult to efficiently cool the intercooler.

On the other hand, the condition that requires cooling of the intercooler is set in advance, and when the engine operating condition reaches the set condition, the cooling medium is injected to automatically cool the intercooler. In this case, for example, in a situation where engine torque is required when starting, the cooling medium cannot be injected because the preset condition is not met regardless of the driver's judgment, and the intercooler is cooled in all situations. If it is attempted automatically and efficiently, the apparatus becomes complicated and the cost increases.

The present invention has been made in view of the above circumstances, and when the cooling medium is cooled by injecting a cooling medium into the air-cooled intercooler of the supercharger, it is possible to respond to the operating state of the engine without disturbing the operation of the driver. It is an object of the present invention to provide a cooling medium injection device for an intercooler, which is capable of efficiently performing cooling.

[0007]

According to the first aspect of the present invention,
Cooling medium injection means for injecting a cooling medium onto the outer surface of an air-cooled intercooler for cooling the intake air, which is arranged between the supercharger and the engine body, and the cooling medium injection means is fixed by inputting a trigger signal. Timer means for operating time,
An automatic mode for operating the injection control means according to the engine operating state and a manual mode for operating the cooling medium injection means by a manual operation input are set, and a trigger signal corresponding to each mode is given priority to the manual mode by the timer means. And an injection control means for outputting a trigger signal in the automatic mode to the mode setting means when the engine operating condition becomes a setting condition.

According to a second aspect of the present invention, in the first aspect of the present invention, the injection control means is configured so that when the engine operating state represented by the temperature, the engine load, and the engine speed is a set condition. It is characterized in that an automatic mode trigger signal is output to the mode setting means.

According to a third aspect of the present invention, in the first aspect of the present invention, the injection control means outputs the present trigger signal only when a set time or more has elapsed after the last trigger signal output. It is characterized by

That is, according to the first aspect of the invention, when the automatic mode or the manual mode is set by the mode setting means, in the automatic mode, a trigger signal is output from the injection control means to the timer means when the engine operating condition becomes a setting condition. Then, the cooling medium is jetted to the outer surface of the air-cooled intercooler for a certain period of time.In the manual mode, the trigger signal by the manual operation input is preferentially output to the timer means even in the automatic mode, and the engine operation is performed. Even if the condition does not reach the set condition, the cooling medium is sprayed on the outer surface of the air-cooled intercooler for a certain period of time.

In this case, according to the second aspect of the invention, when the engine operating state represented by the temperature, the engine load and the engine speed becomes the setting condition, the injection control means causes the mode setting means to trigger the automatic mode. The signal is output, and in the invention according to claim 3, the injection control means outputs the present trigger signal only when the set time or more has elapsed after the previous output of the trigger signal.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a functional block diagram of a water injection device, FIG. 2 is a schematic configuration diagram of an engine control system, and FIG. 3 is a flowchart of a water injection trigger signal generation process by an ECU.

In FIG. 2, reference numeral 1 is an engine body, and in the figure, a cylinder block 1a is divided into two banks (a left bank on the right side and a right bank on the left side) centered on a crankshaft 1b. Right bank #
1 shows a horizontally opposed four-cylinder engine in which cylinders # 1 and # 3 are arranged and cylinders # 2 and # 4 are arranged in the left bank. Cylinder heads 2 are provided on both left and right banks of the cylinder block 1a of the engine body 1, and an intake port 2a and an exhaust port 2b are formed in each cylinder head 2.

An intake manifold 3 is communicated with the intake port 2a, and a throttle valve passage 5 is communicated with an upstream collecting portion of the intake manifold 3 via an air chamber 4. An air cleaner 7 is attached to the upstream side of the throttle valve passage 5 via an intake pipe 6, and the air cleaner 7 is connected to an air intake chamber 8. Further, an exhaust pipe 10 is connected to the exhaust port 2b via an exhaust manifold 9, and a catalytic converter 11 is connected to the exhaust pipe 10 to be connected to a muffler 12.

Further, the throttle valve passage 5 is provided with a throttle valve 5a interlocked with an accelerator pedal (not shown), and an intercooler 13 is interposed in the intake pipe 6 immediately upstream of the throttle valve passage 5. A resonator chamber 14 is provided downstream of the air cleaner 7 in the intake pipe 6.

The resonator chamber 14 and the intake manifold 3 are communicated with each other by a bypass passage 15 that bypasses the upstream side and the downstream side of the throttle valve 5a, and the bypass passage 15 adjusts the amount of idle air. An idle speed control valve (idle speed control valve; ISCV) 16 is installed. Further, the turbocharger 1 as a supercharger is opened immediately downstream of the ISCV 16 when the intake pressure is negative.
A check valve 17 that closes when the intake pressure becomes positive by supercharging by 8 is provided.

The compressor of the turbocharger 18 is installed downstream of the resonator chamber 14 of the intake pipe 6, and the turbine is installed in the exhaust pipe 10. Further, a wastegate valve 19 is provided at the turbine housing inlet of the turbocharger 18, and a wastegate valve actuating actuator 20 is connected to the wastegate valve 19.

The waste gate valve actuating actuator 20 is partitioned into two chambers by a diaphragm, one of which forms a pressure chamber communicating with the waste gate valve control duty solenoid valve 21, and the other of which is the waste gate valve 1 described above.
A spring chamber is formed in which a spring for biasing 9 in the closing direction is housed.

The wastegate valve control duty solenoid valve 21 has a port communicating with the pressure chamber of the wastegate valve actuating actuator 20, and a port communicating with the compressor downstream of the turbocharger 18.
An electromagnetic three-way valve having a port communicating with the resonator chamber 14, and an electronic control unit (ECU) described later.
The valve opening degree of the port communicating with the resonator chamber 14 is adjusted according to the duty ratio of the control signal output from the control signal 50, and the pressure on the resonator chamber 14 side and the pressure on the compressor downstream side are adjusted to adjust the pressure. A control pressure is supplied to the pressure chamber of the wastegate valve operating actuator 20, the opening of the wastegate valve 19 is adjusted, and the supercharging pressure is controlled.

Here, the intercooler 13 is an air-cooling type intercooler that cools the intake air from the turbocharger 18 by the traveling wind introduced from the air intake for the intercooler of the bonnet (not shown).
An injection nozzle 22 for injecting a cooling medium onto the outer surface of the intercooler 13 to secure the cooling performance when the cooling efficiency of the intercooler 13 decreases near the air intake for the intercooler is arranged. ing.

In this embodiment, the intercooler 13 is used.
Water is used as a cooling medium to be sprayed onto the outer surface of the water, the spray nozzle 22 is communicated with a water tank 24 through a passage 23, and the cooling water in the water tank 24 is discharged by a motor-type water spray pump 25 as described above. It is adapted to be ejected from the ejection nozzle 22.

On the other hand, an injector 26 is provided immediately upstream of each intake port 2a of each cylinder of the intake manifold 3.
The fuel in the fuel tank (not shown) is pressure-fed by a fuel pump (not shown), and the fuel pressure to the injector 26 is adjusted to a predetermined pressure by a pressure regulator (not shown).

Further, an ignition plug 27a whose tip is exposed to the combustion chamber is attached to each cylinder of the cylinder head 2, and the ignition plug 27a is provided with an ignition coil 27b provided for each cylinder. The igniter 28 is connected.

Next, the arrangement of the sensors will be described. Reference numeral 29 is an absolute pressure sensor, and the intake pipe pressure / atmospheric pressure switching solenoid valve 30 controls the intake pipe pressure (intake pressure in the intake manifold 3) and the atmospheric pressure. Is selectively detected. Further, an intake air temperature sensor 31 faces the inlet side of the air cleaner 7 on the downstream side of the air intake chamber 8,
Immediately downstream of the air cleaner 7, a thermal intake air amount sensor 32 using a hot wire or a hot film is provided. Further, the throttle valve 5a has a built-in throttle opening sensor 33a and an idle switch 33b which is turned on when the throttle is fully closed.
Are connected.

Further, a knock sensor 34 is attached to the cylinder block 1a of the engine body 1, and a water temperature sensor 36 is exposed to a cooling water passage 35 which communicates the left and right banks of the cylinder block 1a.
The O2 sensor 37 is exposed to the collecting portion of the exhaust manifold 9 of No. 0. Also, the crankshaft 1b
A crank angle sensor 39 is provided on the outer periphery of a crank rotor 38 that is axially mounted on the cam rotor 40. A cam angle sensor 41 for cylinder discrimination is attached to a cam rotor 40 that is connected to the cam shaft 1c.
Are opposed to each other.

The above sensors / switches and actuators are connected to an ECU 50 including a microcomputer. The ECU 50 processes detection signals from the sensors / switches, and the fuel injection amount, ignition timing, and wastegate valve. Control duty solenoid valve 21
The duty ratio of the drive signal for the ISCV16 and the duty ratio of the drive signal for the ISCV16 are calculated to perform the air-fuel ratio learning control, the ignition timing control, the boost pressure control, the idle rotation speed control, etc., and according to the engine operating state. Various controls such as water injection control for automatically injecting water into the intercooler 13 are performed.

In this case, the water injection to the intercooler 13 is performed by a manual mode switch 43 or an automatic mode switch 44 arranged on an instrument panel (not shown).
The timer unit 45 for driving the water injection pump 25 is connected to the power source VC via the manual mode switch 43 and also connected to the power source VC via the relay contact of the relay 46. The relay coil of the relay 46 has one end connected to the power source VC and the other end connected to the ECU 50 via the automatic mode switch 44.

The manual mode switch 43 is a manual mode in which water is jetted at the discretion of the driver, for example, when the driver feels that the cooling performance of the intercooler 13 needs to be improved immediately before starting. Is a switch for setting the
It is a switch for setting an automatic mode in which water injection is automatically performed by U50 according to the engine operating state.

As shown in FIG. 1, the water injection device of the intercooler 13 includes a cooling medium injection means 47 including an injection nozzle 22, a water tank 24, a water injection pump 25 and the like, and a timer means 48 including a timer unit 45. Is connected to the timer means 48, and the injection control means 50a is connected to the timer means 48 via a mode setting means 49 including a manual mode switch 43, an automatic mode switch 44, and a relay 46.

Further, the injection control means 50a sets the engine operating state by the cooling water temperature TW and the intake air temperature Ta indicating the temperature state, the intake pipe pressure P indicating the engine load, and the engine speed NE, and the previous condition. After the trigger signal is output, the trigger signal is output when the set time or more has elapsed, and the function is realized by the ECU 50.

That is, the manual mode switch 43 is turned on.
Then, the trigger signal from the power supply VC is sent to the timer unit 4
When the automatic mode switch 44 is turned on, the relay 46 is turned on by the trigger signal output from the ECU 50, and the relay contact is closed. A trigger signal from the power source VC is input to the timer unit 45, and the automatic mode is performed in which water injection is automatically performed according to the engine operating state. In this automatic mode, when the driver turns on the manual mode switch 43 while waiting until the engine operating condition reaches the set condition, this manual mode is prioritized and water injection is performed regardless of the engine operating condition. .

Further, the timer unit 45 drives the water injection pump 25 for a fixed time (for example, 5 seconds) by one input of the trigger signal, and in the automatic mode, the trigger signal is input again while the timer is operating. Therefore, even if the operating condition is the set condition, the trigger signal is not output when the set time or more has not elapsed since the previous trigger signal was output. For example, the capacity of the water tank 24, the water injection The remaining amount of cooling water in the water tank can be known from the discharge pressure of the pump 25, parameters such as the opening area of the injection nozzle 22, the timer operating time, and the number of timer operations (the number of trigger signal outputs).

In this embodiment, the trigger signal is input to the timer unit 45 via the relay 46 in the automatic mode, but the relay 46 is omitted and the ECU is omitted.
The trigger signal from 50 may be input to the timer unit 45 via the automatic mode switch 44.

Next, the water injection trigger signal generation processing by the ECU 50 will be described with reference to the flowchart of FIG.

The program shown in FIG. 3 is executed in the ECU 50, for example, every set time, and first, in step S101.
The cooling water temperature TW is the set water temperature TWSET (for example, 70 ° C)
When TW <TWSET, the engine temperature is low. Therefore, it is determined that the intake air can be sufficiently cooled by the intercooler 13 even if supercharging by the turbocharger 18 is performed. When TW ≧ TWSET, the process proceeds to step S102, and it is checked whether or not the set time has elapsed since T seconds (for example, 5 seconds) or more since the last trigger signal transmission.

When the set time has not elapsed since the last trigger signal was sent, the program exits from step S102, and when the set time or more has elapsed, the step
The routine proceeds from step S102 to step S103, where the intake air temperature Ta is equal to the set temperature T.
Check whether aSET (for example, 10 ° C) or higher, Ta <
When TaSET, it is determined that it is not necessary to cool the intercooler 13, and the program is exited. When Ta ≧ TaSET, the process proceeds to step S104.

In step S104, it is checked whether or not the intake pipe pressure P is equal to or higher than a set pressure PSET (for example, a set value equal to or higher than the atmospheric pressure due to supercharging), and P <PSET. When P ≧ PSET, step S10
Go to step 5 and check whether the engine speed NE is equal to or higher than the set speed NESET (for example, 4000 rpm). And N
When the engine speed is low such that E <NESET, step S105.
Similarly, when NE ≧ NESET, that is, when the cooling water temperature TW and the intake air temperature Ta are equal to or higher than the set temperature, the intake pipe pressure P is equal to or higher than the set value, and the engine is running at high speed. At some time, it is determined that the cooling of the intercooler 13 is insufficient with only the traveling wind, a trigger signal is transmitted in step S106, and the program exits.

As a result, the automatic mode switch 44 is turned on.
If the trigger signal is applied, the relay 4
6 is turned on, the relay contact of the relay 46 is closed, the trigger signal from the power source VC is input to the timer unit 45, and the water is automatically injected into the intercooler 13 by lighting a pilot lamp (not shown). Notify the driver that a car will take place. Then, the timer unit 45
As a result, the water injection pump 25 is driven for a certain period of time, and the cooling water in the water tank 24 is injected onto the outer surface of the intercooler 13.

That is, the automatic mode switch 44 is turned on.
By doing so, the water is automatically injected into the intercooler 13 at an appropriate timing according to the engine operating state during operation, and the cooling capacity of the intercooler 13 is efficiently increased without bothering the driving operation. Not only is it possible to perform water injection, but if the manual mode switch 43 is turned on, water can be injected at any time according to the judgment of the driver, and the cooling capacity of the intercooler 13 can be improved with a simple configuration in response to any situation such as starting. It can be increased.

[0040]

As described above, according to the present invention, when the cooling medium is injected into the air-cooling intercooler of the supercharger to cool it, the automatic mode is set so that the automatic operation is automatically performed during operation. In addition, the cooling medium is injected into the intercooler at an appropriate timing according to the engine operating state, so that the cooling capacity of the intercooler can be efficiently increased without bothering the driving operation, and it can be manually operated by the driver. Since the cooling medium is injected with priority given to the mode, the cooling capacity of the intercooler can be increased and the engine output performance can be improved with a simple configuration in response to all situations from start to operation.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a water injection device.

FIG. 2 is a schematic configuration diagram of an engine control system.

FIG. 3 is a flowchart of a water injection trigger signal generation process by the ECU.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine main body 13 ... Intercooler 18 ... Turbocharger (supercharger) 47 ... Cooling medium injection means 48 ... Timer means 49 ... Mode setting means 50a ... Injection control means

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area F02M 31/20 F02M 31/20 L

Claims (3)

[Claims] 1. A cooling medium injection means for injecting a cooling medium onto the outer surface of an air-cooled intercooler for cooling intake air, which is arranged between a supercharger and an engine body, and the cooling is performed by inputting a trigger signal. Timer means for operating the medium injection means for a certain period of time, automatic mode for operating the injection control means according to the engine operating state, and manual mode for operating the cooling medium injection means by manual operation input are set, and each mode is set. A mode setting means for outputting a corresponding trigger signal to the timer means with priority given to the manual mode; and an injection control means for outputting a trigger signal in the automatic mode to the mode setting means when the engine operating condition becomes a setting condition. A cooling medium injection device for an intercooler characterized by the above. 2. The injection control means outputs an automatic mode trigger signal to the mode setting means when an engine operating state represented by a temperature, an engine load, and an engine speed becomes a setting condition. The cooling medium injection device for an intercooler according to claim 1. 3. The intercooler cooling according to claim 1, wherein the injection control means outputs the present trigger signal only when a set time or more has elapsed after the last trigger signal output. Medium ejector.