JPH0121139Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for regulating and controlling the maximum speed of a vehicle driven by an exhaust turbocharged internal combustion engine.

[Conventional technology]

When an exhaust turbo supercharger is installed on an internal combustion engine, the output of the engine increases, so when this exhaust turbo supercharged internal combustion engine is installed in a vehicle such as a car, the maximum speed of the vehicle will be lower than that of a non-supercharged internal combustion engine. They can rise significantly more dangerously than in engine-driven vehicles.

Therefore, in order to solve the above problem, Japanese Patent Publication No. 56-10452 as a prior art proposes an intake bypass passage for the blower compressor in the exhaust turbocharger in the intake system of the exhaust turbocharged internal combustion engine. is provided, and when the speed of the vehicle reaches a dangerous speed, the intake bypass passage is opened by a control valve provided in the intake bypass passage to lower the supercharging pressure, thereby controlling the maximum speed. is suggesting.

[Problem that the invention attempts to solve]

However, the intake system of an exhaust turbocharged internal combustion engine is equipped with a blow-off bypass passage equipped with a blow-off valve in order to prevent the supercharging pressure from increasing abnormally during deceleration. Providing an intake bypass passage with a control valve for regulating the maximum speed of the vehicle in addition to this blow-off bypass passage with a blow-off valve in the intake system of a supercharged internal combustion engine increases the installation space, This results in a complicated structure and an increase in weight.

The present invention solves the above problem by making the blow-off valve in the blow-off bypass passage also serve as a control valve for regulating the maximum speed of the vehicle.

[Means for solving problems]

Therefore, in the present invention, the valve body of the blow-off valve in the blow-off bypass passage is connected to a diaphragm that partitions the inside of the diaphragm case into a first pressure chamber and a second pressure chamber, and the first pressure chamber is
The boost pressure downstream from the blower compressor is introduced so that the valve body of the blow-off valve is opened by the boost pressure, while the boost pressure from the downstream side from the blower compressor is introduced into the second pressure chamber. An introduction passage is connected to the supercharging pressure introduction passage, and when the vehicle speed is below a predetermined value in relation to the vehicle speed sensor of the vehicle, supercharging pressure is introduced into the second pressure chamber, and when the vehicle speed is above a predetermined value, the supercharging pressure is introduced into the second pressure chamber. The structure includes a switching valve that switches the second pressure chamber to communicate with the suction passage of the blower compressor or the atmosphere.

[Effect]

In this configuration, while supercharging pressure is always acting on the first pressure chamber in the diaphragm case, supercharging pressure is introduced when the vehicle speed is not in a dangerous state, that is, when the vehicle speed is below a predetermined speed. Since the switching valve in the passage introduces supercharging pressure into the first pressure chamber in the diaphragm case, no pressure difference occurs between the two pressure chambers in the diaphragm case. The blow-off valve is therefore not actuated by the diaphragm. When the throttle valve is suddenly closed to decelerate, if the boost pressure on the downstream side exceeds a predetermined pressure due to the inertial rotation of the blower compressor, the valve body of the blow-off valve will resist its spring due to the boost pressure. By opening the blower and releasing the supercharging pressure to the upstream side of the blower compressor, blow-off control is performed to prevent the supercharging pressure from increasing any further.

When the speed of the vehicle reaches a dangerous state exceeding a predetermined value, the switching valve switches the second pressure chamber in the diaphragm case to communicate with the suction passage of the blower compressor or the atmosphere, thereby reducing the first pressure. Since supercharging pressure is introduced into the chamber and a pressure difference is created between the two pressure chambers, the valve body in the blow-off valve opens due to the supercharging pressure in the first pressure chamber, releasing supercharging air and starting supercharging. By reducing the pressure,
The vehicle speed is reduced.

〔Example〕

Hereinafter, the present invention will be explained with reference to drawings of embodiments. In the drawings, reference numeral 1 indicates an internal combustion engine, and reference numeral 2
1 and 2 each show an exhaust turbo supercharger in which an exhaust turbine 3 and a blower compressor 4 are directly connected, and an exhaust turbo supercharger that connects the discharge side of the blower compressor 4 in the exhaust turbo supercharger 2 and the intake port of the internal combustion engine 1. A surge tank 6 for eliminating pulsation and a carburetor 7 with a throttle valve are provided in the supply passage 5 with the surge tank 6 on the upstream side, and on the suction side of the blower compressor 4,
Air cleaner 8 with built-in filter element 9
are connected via an intake passage 10 , and an exhaust passage 11 from the exhaust port of the internal combustion engine 1 is connected to the inlet side of the exhaust turbine 3 in the exhaust turbocharger 2 . An exhaust pipe 12 to the atmosphere is connected to each outlet side.

Reference numeral 13 indicates a bypass passage that connects the air cleaner 8 or suction passage 10 and the surge tank 6 or supercharging passage 5 so as to bypass the blower compressor 4, and a blow-off valve 14 is provided in the bypass passage 13. The blow-off valve 14 is made up of a valve body 17 that opens and closes a valve seat port 16 in a valve box 15, and a spring 18 that biases the valve body 17 in a normally closed direction with respect to the valve seat 16. When the boost pressure downstream of the compressor 4 becomes higher than a certain value, the valve body 17 opens against the spring 18 due to the boost pressure.

The valve body 17 of the blow-off valve 14 is first inserted into the diaphragm case 19 attached to the valve box 15.
The first pressure chamber 22 in the diaphragm case 19 is connected via a rod 21 to a diaphragm 20 that partitions into a pressure chamber 22 and a second pressure chamber 24.
The boost pressure on the downstream side of the blower compressor 4 is introduced via the boost pressure transmission passage 23 so that the valve body 17 of the blow-off valve 14 is opened by the boost pressure, while the second The pressure chamber 24 is connected to a supercharging pressure introduction passage 25 connected to a surge tank 6 or the like on the downstream side of the blower compressor.

The supercharging pressure introduction passage 25 is normally communicated with the supercharging pressure introduction passage 23 so that the supercharging pressure is transmitted to the second pressure chamber 24, but by cutting off the electricity, At the same time, the introduction of supercharging pressure to the second pressure chamber 24 is cut off, and at the same time, the second pressure chamber 24
An electromagnetic three-way switching valve 27 is provided, which is operated by switching the valve to communicate with the suction passage 10 of the blower compressor 4 or the atmospheric passage 26 to the air cleaner 8, etc., and the switching valve 27 is connected to the vehicle speed sensor 28 of the vehicle. ,
The solenoid of the switching valve 27 is energized until the vehicle speed reaches a dangerous maximum speed, but the solenoid of the switching valve 27 is de-energized when the vehicle speed reaches the dangerous maximum speed.

When the speed of the vehicle has not reached the dangerous maximum speed, the switching valve 27 in the supercharging pressure introduction passage 24 is energized, and therefore the switching valve 27 prevents the second pressure chamber 24 from being overcharged. The valve body 17 of the blow-off valve 14 is opened by the diaphragm 20 because there is no pressure difference between the blow-off valve 14 and the first pressure chamber 22 where the boost pressure is constantly applied. The supercharging pressure acts on the valve body 17 only on the inner diameter portion of the valve seat 16.

When the boost pressure on the downstream side of the blower compressor 4 becomes abnormally high during deceleration due to sudden closing of the throttle valve in the carburetor 7, the high boost pressure acts on the portion of the valve body 17 on the valve seat 15 side. As a result, the valve body 17 opens against the spring 18, and blow-off control is performed in which the supercharging pressure is released to the upstream side of the blower compressor 4.

When the speed of the vehicle increases and reaches a dangerous maximum speed, the switching valve 27 in the supercharging pressure introduction passage 24
The current flowing to the switching valve 27 is cut off.
However, since the second pressure chamber 24 is switched to communicate with the atmospheric passage 26 and a pressure difference is created between the two pressure chambers 22 and 24, the valve body 1 in the blow-off valve 14
7 opens against the spring 18 due to the supercharging pressure acting on the first diaphragm chamber 22, and the supercharging air is released and the supercharging pressure is lowered, thereby reducing the vehicle speed. Since the switching valve 27 switches to introduce supercharging pressure into the first pressure chamber 22, the valve body 17 of the blow-off valve 14 and its spring 18 close the blow-off valve 14.

In addition, in the blow-off valve 14, the valve body 17
The spring 18 that urges the diaphragm case 19 to be normally closed may be provided within the second pressure chamber 24 in the diaphragm case 19.

[Effect of idea]

As described above, the present invention utilizes a blow-off bypass passage equipped with a blow-off valve to prevent supercharging pressure from becoming abnormally high during deceleration caused by sudden closing of the throttle valve. Therefore, there is no need to provide an intake bypass passage with a control valve for regulating the maximum speed of the vehicle in addition to a blow-off bypass passage with a blow-off valve for the intake system of the internal combustion engine. It is possible to reliably avoid an increase in installation space, a complicated structure, and an increase in weight, and it also has the effect of being able to be provided at a low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being an overall view and FIG. 2 being an enlarged sectional view of a blow-off valve. 1... Internal combustion engine, 2... Exhaust turbo supercharger, 3
...Exhaust turbine, 4...Blower compressor, 7...
...supercharging passage, 8...air cleaner, 10...suction passage, 13...bypass passage, 14...blow-off valve, 15...valve box, 16...valve seat, 17...valve body, 18...spring , 19...Diaphragm, 20
...Diaphragm, 22...First pressure chamber, 23
...Supercharging pressure transmission passage, 24...Second pressure chamber, 2
5...Supercharging pressure introduction passage, 26...Atmospheric passage, 27
...Switching valve, 28...Sensor.

Claims (1)

[Scope of utility model registration request] A bypass passage connecting the upstream side and the downstream side of the blower compressor in the exhaust turbo supercharger installed in the internal combustion engine is provided, and in the bypass passage,
In the exhaust turbocharged internal combustion engine, the exhaust turbocharged internal combustion engine is provided with a blow-off valve whose valve body opens against a spring when the boost pressure downstream of the blower compressor increases. A valve body in the valve is connected to a diaphragm that partitions the inside of the diaphragm case into a first pressure chamber and a second pressure chamber, and supercharging pressure downstream from the blower compressor is supplied to the first pressure chamber. The supercharging pressure is introduced so that the valve body of the blow-off valve opens, and a supercharging pressure introduction passage from the downstream side of the blower compressor is connected to the second pressure chamber, and a supercharging pressure introduction passage from the downstream side of the blower compressor is connected to the second pressure chamber. In this method, supercharging pressure is introduced into the second pressure chamber when the vehicle speed is below a predetermined value in relation to the vehicle speed sensor of the vehicle, and when the vehicle speed is above the predetermined value, the second pressure chamber is introduced into the suction passage of the blower compressor. Or a maximum speed control device for a vehicle equipped with an exhaust turbocharged internal combustion engine, which is equipped with a switching valve that switches to communicate with the atmosphere.