JPS59156833A - Air mechanism of vehicle - Google Patents

Abstract

PURPOSE:To reduce the size of an air compressor and decrease the output load of an internal-combustion engine by improving the filling rate of the air compressor. CONSTITUTION:When an internal-combustion engine 3 is driven and a discharge turbine supercharger 2 is rotated by the discharge pressure of the engine 3, the boost pressure of the discharge turbine supercharger 2 is fed to a microcomputer 20 as an electric signal by a pressure sensor 13. If this boost pressure P is less than a predetermined pressure, the CPU22 closes the solenoid valve 8 of a branch pipe 6 and opens the solenoid valve 9 of a suction pipe 7. If the boost pressure exceeds the predetermined pressure, the CPU22 opens the solenoid valve 8 of the branch pipe 6 and closes the solenoid valve 9 of the suction pipe 7. Thereby, the pressure of the intake air of an air compressor 1 is increased and the load of the air compressor 1 is reduced. The increased air pressure is regulated to a fixed pressure by a pressure regulator 11 and is filled into an air tank 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an air mechanism for a vehicle equipped with an exhaust turbine supercharger.

[Description of prior art]

Conventionally, the intake air pressure of the air compressor in this type of vehicle was atmospheric pressure, so it took a long time to fill the air tank with compressed air, and the air compressor had to be enlarged to secure air reserves. There were certain drawbacks.

[Purpose of the invention]

The present invention solves the above drawbacks by improving the filling rate of the near compressor, downsizing the near compressor, and
An object of the present invention is to provide an air mechanism for a vehicle that can reduce the output load of an internal combustion engine.

[Features of the invention]

The present invention includes a branch pipe that branches from an intake pipe interposed between an exhaust turbine supercharger and an internal combustion engine and is connected to an intake pipe of a near compressor, and detects the boost pressure in the intake pipe as an electrical signal. a first solenoid valve that opens and closes the branch pipe; a second solenoid valve that is provided at the inlet of the near compressor that opens and closes the connection between the suction pipe and the atmosphere; and a detection of the pressure sensor. and a control circuit that receives the signal as input information and controls the opening and closing of the first and second solenoid valves, and the control circuit closes the first solenoid valve and closes the second solenoid valve except during overboost. A solenoid valve is opened, and in the event of overboost, the first solenoid valve is opened and the second solenoid valve is closed.

[Explanation based on examples]

An explanation will be given below based on the drawings of the embodiment.

FIG. 1 is a block diagram of an air mechanism according to an embodiment of the present invention. 1st
In the figure, 1 is a near compressor of the vehicle, 2 is an exhaust turbine supercharger, and 3 is an internal combustion engine. A branch pipe 6 is provided branching off from an intake pipe 4 interposed between the exhaust turbine supercharger 2 and the internal combustion engine 3. This branch pipe 6 is connected to the middle of the suction pipe 7 of the near compressor 1. This branch pipe 6
A solenoid valve 8 is interposed in the middle, and a solenoid valve 9 is provided at the suction port of the suction pipe 7 of the near compressor 1. Furthermore, an air tank 12 is connected to the output pipe of the near compressor 1 via a pressure regulator 11 . A pressure sensor 13 is provided within the intake pipe 4 to detect boost pressure, which is the output pressure of the exhaust turbine supercharger 2, as an electrical signal. 16 is an exhaust pipe, 17 is an exhaust relief valve, and 18 is a pressure gauge.

The output of the pressure sensor 13 is connected to the CPU 22 via the input interface ACE 21 of the microcomputer 20 mounted on this vehicle. A memory 23 is connected to this CPU 22 . This memory 23 stores control information for the solenoid valves 8 and 9 according to the boost pressure. The output of the CPU 22 is connected via an output interface 24 to the control inputs of the solenoid valves 8 and 9.

With such a configuration, the operation of the air mechanism of this embodiment will be explained based on the flowchart of FIG. 2. First, when the internal combustion engine 3 is driven and the exhaust turbine supercharger 2 is rotated by the exhaust pressure of the engine 3, the boost pressure of the exhaust turbine supercharger 2 is input by the pressure sensor 13 to the microcomputer 20 as an electrical signal. The CPU 22 uses this boost pressure P
If the pressure is less than a predetermined pressure, for example 8 kg/cJ, the solenoid valve 8 of the branch pipe 6 is closed and the solenoid valve 9 of the suction pipe 7 is opened. As a result, the near compressor 1 is driven by the rotating shaft of the engine 3 with atmospheric pressure as the initial pressure, like a conventional near compressor.

Next, when the engine 3 rotates at high speed and the boost pressure of the exhaust turbine supercharger 2 exceeds the predetermined pressure of 8 kg/ca, CP
The LT 22 opens the solenoid valve 8 of the branch pipe 6 and closes the solenoid valve 9 of the suction pipe 7. As a result, the pressure of the air taken into the near compressor 1 increases, and the load on the near compressor 1 is reduced. The air pressure increased by near compressor 1 is
The air tank 1 is regulated at a constant pressure by the pressure regulator 11.
2 is filled.

In the above example, the exhaust turbine supercharger 2 is provided with the exhaust relief valve 17, but if the boost pressure when opening the solenoid valve 8 is set to be almost the same as the activation pressure of the exhaust relief valve 17, , the exhaust relief valve 17 can also be omitted.

[Effects of the Invention] As described above, according to the present invention, the output side of the exhaust turbine supercharger is connected to the suction side of the near compressor, and the first electromagnetic valve is provided therebetween, and the suction side of the near compressor is connected to the output side of the exhaust turbine supercharger. A second solenoid valve is installed at the mouth, and the first solenoid valve is closed by computer control during normal engine rotation, and at the same time the second solenoid valve is opened to drive the near compressor as before, and when the engine is overboosted. By opening the first solenoid valve and simultaneously closing the second solenoid valve to guide the boosted surplus air to the near compressor, the load on the near compressor is reduced and the filling rate of the near compressor is improved. The compressor can be made smaller, the load that the internal combustion engine spends driving the near compressor is reduced, and there is an excellent effect that the fuel consumption of the engine can be reduced.

In addition, by setting the boost pressure that opens the first solenoid valve to be approximately equal to the activation start pressure of the exhaust relief valve, it can be omitted from the exhaust turbine supercharger, which has the advantage of reducing the size and weight of the exhaust turbine supercharger. be.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an air mechanism according to an embodiment of the present invention. FIG. 2 is a flow chart 1-0 showing the operation of the microcomputer ■...Near compressor, 2...-Exhaust turbine supercharger, 3...Internal combustion engine, 4...Intake pipe, 6...・Branch pipe, 7... Suction pipe, 8.9... Solenoid valve, 11...
Pressure regulator, 12...Air tank, 13...Pressure sensor, 20...Microcomputer, 22...C
PU, 23...Memory. Patent Applicant Hino Motors Co., Ltd. Representative Patent Attorney Naotaka Ide Figure 1 Figure 2

Claims (1)

[Claims] (1) A near compressor connected to the rotating shaft of the vehicle's internal combustion engine, an air tank that stores the compressed air obtained from the output of this near compressor, and ``The air pressure in this air tank is kept at a constant pressure of 1 liter!
and an exhaust turbine supercharger for the internal combustion engine. A branch pipe connected to the suction pipe of the near compressor, a pressure sensor that detects the boost pressure in the suction pipe as an electrical signal, a first solenoid valve that opens and closes the branch pipe, and a first electromagnetic valve provided at the suction port of the near compressor. A second solenoid valve that opens and closes the connection between the intake pipe and the atmosphere, and a control circuit that receives a detection signal from the pressure sensor as input information and controls the opening and closing of the first and second solenoid valves, The control circuit closes the first solenoid valve and opens the second solenoid valve when the boost pressure is less than a predetermined pressure, and closes the first solenoid valve when the boost pressure is equal to or higher than the predetermined pressure. An air mechanism for a vehicle, characterized in that it is configured to open and close the second solenoid valve.