JPH0121138Y2 - - 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-mentioned problem, Japanese Patent Publication No. 56-10452 as a prior art proposes an intake bypass for the blower compressor in the exhaust turbocharger in the intake system of the exhaust turbocharged internal combustion engine. A passage is provided, and when the speed of the vehicle reaches a dangerous speed, the maximum speed is controlled by opening the intake bypass passage with a control valve provided in the intake bypass passage and lowering the supercharging pressure. is proposed.

[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 on the downstream side of the blower compressor is introduced through the boost pressure introduction passage so that the valve body of the blow-off valve is opened by the boost pressure, and the second pressure chamber is connected to the blower compressor. While communicating with the suction passage or the air cleaner, a suction passage of the blower compressor or a communication passage with the air cleaner is connected to the supercharging pressure introduction passage, and the connecting part of the communication passage with the supercharging pressure introduction passage is connected to the vehicle. In connection with the vehicle speed sensor, when the vehicle speed is below a predetermined value, the supercharging pressure introduction passage is shut off and the first pressure chamber is communicated with the communication passage, and when the vehicle speed is above the predetermined value, the first pressure chamber is communicated with the communication passage. This configuration includes a switching valve that operates to switch to cut off communication to the passage and communicate with the boost pressure introduction passage.

[Effect]

In this configuration, when the vehicle speed is not in a dangerous state, that is, when it is below the predetermined vehicle speed,
A switching valve in the supercharging pressure introduction passage blocks introduction of supercharging pressure to the first pressure chamber in the diaphragm case, and at the same time communicates the first pressure chamber with the suction passage of the blower compressor or the communication passage to the air cleaner. Under these conditions, there is almost no pressure difference between the second pressure chamber and the first pressure chamber, which are always in communication with the suction passage of the blower compressor or the air cleaner, and therefore the blow-off valve is closed by the diaphragm. It doesn't work. When the boost pressure on the downstream side exceeds a predetermined pressure due to the inertial rotation of the blower compressor during deceleration due to sudden closing of the throttle valve, the valve body of the blow-off valve is pressed against its spring by the boost pressure. Blow-off control is performed to prevent the supercharging pressure from increasing further by opening against the pressure and releasing the supercharging pressure to the upstream side of the blower compressor.

When the speed of the vehicle reaches a dangerous state exceeding a predetermined value, the switching valve cuts off communication to the communication passage of the first pressure chamber in the diaphragm case, and at the same time closes the communication between the first pressure chamber and the supercharging pressure introduction passage to the first pressure chamber. The boost pressure is introduced into the first pressure chamber, and the second pressure chamber, which communicates with the atmosphere, is switched to communicate with the atmosphere.
Since a pressure difference is created between the first pressure chamber and the second pressure chamber, the valve body of the blow-off valve opens against its spring due to the supercharging pressure acting in the first pressure chamber, releasing supercharging air and starting supercharging. By lowering the pressure, the vehicle speed can be lowered.

〔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. In the supply passage 5, a surge tank 6 for eliminating pulsation and a carburetor 7 with a throttle valve are provided with the surge tank 6 on the upstream side, and a filter element 9 is built in on the suction side of the blower compressor 4. An air cleaner 8 is connected to the exhaust turbocharger 2 via an intake passage 10, and an exhaust passage 11 from the exhaust port of the internal combustion engine 1 is connected to the exhaust turbine 3 on the inlet side of the exhaust turbocharger 2. Exhaust pipes 12 to the atmosphere are connected to the outlet sides of the pumps 3, respectively.

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 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. The valve body 17 is configured to open against the spring 18 when the boost pressure downstream of the engine 4 becomes higher than a certain value.

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.
Then, the boost pressure downstream of the blower compressor 4 is introduced through the boost pressure introduction 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 and communicated with the air cleaner 8 or the suction passage 10 via a passage 25.

A communication passage 26 to the air cleaner 8 or the suction passage 10 is connected to the supercharging pressure introduction passage 23, and the connection part of the communication passage 26 to the supercharging pressure introduction passage 23 is normally not energized. to shut off the introduction of supercharging pressure to the first pressure chamber 22, and
2 is communicated with the communication passage 26, but by cutting off the electricity, the communication between the first pressure chamber 22 and the communication passage 26 is cut off, and at the same time, supercharging pressure is introduced into the first pressure chamber 22. An electromagnetic three-way switching valve 27 is provided, and the switching valve 27 is connected to a vehicle speed sensor 28 of the vehicle, and the solenoid of the switching valve 27 is energized until the vehicle speed reaches a dangerous maximum speed. When the vehicle speed reaches a dangerous maximum speed, the solenoid of the switching valve 27 is de-energized.

When the vehicle speed has not reached the dangerous maximum speed, the switching valve 27 is not energized, and therefore, the switching valve 27 blocks the introduction of supercharging pressure to the first pressure chamber 22. However, since the first pressure chamber 22 is communicated with the communication passage 26 to the air cleaner 8 or the suction passage 10, and the supercharging pressure downstream from the blower compressor 4 is not applied to the first pressure chamber 22, The valve body 17 of the blow-off valve 14 is not opened by the diaphragm 20, and 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 inner diameter portion of the valve seat 16 in the valve body 17. 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.

Then, when the vehicle speed increases and reaches a dangerous maximum speed, the current flowing to the switching valve 27 is cut off, and the switching valve 27 cuts off the communication between the first pressure chamber 22 and the communication path 26. At the same time, the switching operation is performed to introduce supercharging pressure into the first pressure chamber 22. Therefore, the valve body 17 of the blow-off valve 14 is pressed against the spring 18 by the supercharging pressure acting on the first pressure chamber 22. The vehicle speed is lowered by resisting the opening and releasing the supercharged air to lower the supercharging pressure. When the vehicle speed decreases, the switching valve 27 introduces the supercharging pressure into the first pressure chamber 22. The valve body 17 of the blow-off valve 14 is closed by its spring 18 in order to shut off the air and communicate the first pressure chamber 22 with the communication path 26.

In addition, in the blow-off valve 14, the valve body 17
The spring 18 that urges the diaphragm to be normally closed may be provided in the second diaphragm 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, 9...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 case, 20...Diaphragm, 22...First pressure chamber, 24...Second pressure chamber, 23...Supercharging pressure introduction passage, 26...Communication passage, 27...Switching valve , 28...
…Vehicle Speed 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 boost pressure is introduced through the boost pressure introduction passage so that the valve body of the blow-off valve is opened by the boost pressure, and the second pressure chamber is communicated with the suction passage of the blower compressor or the air cleaner. The intake passage of the blower compressor or the communication passage to the air cleaner is connected to the introduction passage, and the connection part of the communication passage to the supercharging pressure introduction passage is connected to the introduction passage when the vehicle speed is below a predetermined value in relation to the vehicle speed sensor. The supercharging pressure introduction passage is cut off and the first pressure chamber is communicated with the communication passage, and when the vehicle speed of the vehicle is higher than a predetermined speed, the communication of the first pressure chamber with the communication passage is cut off and the supercharging pressure introduction passage is opened. 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 exhaust gas.