JPH0749773B2 - Control device for supercharger for vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a supercharger for a vehicle, and in particular, introduces while switching intake pipe pressure and exhaust pipe pressure to control supercharging pressure. The present invention relates to a control device for a supercharger for a vehicle, which achieves reliable vehicle speed control, has a simple configuration, and can reduce costs.

[Conventional technology]

In a supercharger for a vehicle, the supercharging pressure rises in proportion to the engine speed. Therefore, if the supercharging pressure rises too much, the supercharger and the internal combustion engine will be damaged. Therefore, for example, when the supercharging pressure in the air supply passage on the downstream side of the supercharger compressor exceeds the set value, a bypass passage provided to bypass the turbocharger turbine is opened to release a part of the exhaust gas. The waste gate system that controls the supply pressure prevents the supercharging pressure from exceeding the set value by the control device, and maintains the durability of the engine.

[Problems to be solved by the invention]

By the way, in a conventional control device for a supercharger for a vehicle,
As shown in FIG. 5, a first passage 108 is provided which connects the actuator 102 for opening and closing the waste gate valve 100 and the downstream intake passage 106-3 of the supercharger compressor 104, and the first passage 108 and the air cleaner 110. Upstream intake passage 106
-1 is provided with a second passage 112 communicating with the second passage 112.
Along the way, an electromagnetic switching valve 118 operated by a control unit 116 that receives a signal from the vehicle speed sensor 114 and outputs a switching control signal.
And a first throttle 120 on the intake passage side of the first passage 108 and a second throttle on the first passage side of the second passage 112.
The diaphragm 122 was provided.

At normal times, the intake pipe pressure is set to the first and second throttles.
While being controlled by 120 and 122, a part of this intake pipe pressure is returned to the intake passage 106-1 on the upstream side of the air cleaner, so that the actuator 102 is operated by the controlled weak intake pipe pressure. Further, when the vehicle speed increases and the vehicle speed sensor 114 operates, the vehicle speed sensor 1
When the electromagnetic switching valve 118 is operated to close the second passage 112 by the control unit 116 that receives the signal from 14,
Since a large intake pipe pressure is introduced into the actuator 102, the waste gate valve 100 is further opened to reduce the supercharging pressure to control the vehicle speed.

However, it is necessary to operate the actuator with an intake pipe pressure weaker than the controlled required intake pipe pressure,
It is difficult to set the first and second diaphragms, and it is necessary to improve the accuracy of a control device such as an actuator, which complicates the configuration and increases the cost.

[Object of the Invention]

Therefore, in order to eliminate the above-mentioned inconvenience, an object of the present invention is to provide a waste gate valve and an actuator for opening and closing the waste gate valve in a control device for a supercharger for a vehicle. A passage for introducing the pipe pressure is provided, a switching valve for controlling the introduction of either the intake pipe pressure or the exhaust pipe pressure to the actuator is provided, a vehicle speed sensor for detecting the vehicle speed is provided, and the vehicle speed is a predetermined speed. When a signal from the vehicle speed sensor is input when the above conditions occur, a switching control signal is output to the switching valve, and a control unit that controls switching to introduce exhaust pipe pressure to the actuator is provided. The exhaust pipe pressure, which is stronger than the intake pipe pressure, is introduced into the actuator, and the waste gate valve is opened more to reduce the boost pressure, Together to obtain reliably perform the speed control, configuration is simple, in implementing the control apparatus for a vehicle turbocharger, which may be a cheaper cost.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a waste gate valve in a bypass passage that bypasses the turbocharger turbine and communicates with the exhaust passage, and opens and closes the waste gate valve. In a control device for a supercharger for a vehicle, the actuator is provided with a passage for introducing an intake pipe pressure and an exhaust pipe pressure, and one of the intake pipe pressure and the exhaust pipe pressure is introduced into the actuator. A switching valve for switching control is provided so that a vehicle speed sensor for detecting the vehicle speed is provided. When the vehicle speed exceeds a predetermined speed, a signal from the vehicle speed sensor is input and a switching control signal is output to the switching valve. It is characterized in that the actuator is provided with a control unit for controlling the switching so as to introduce the exhaust pipe pressure.

[Action]

With the above configuration, normally, the actuator is actuated by the intake pipe pressure to open the waste gate valve to control the supercharging pressure, and the vehicle speed increases to a predetermined speed or more and the vehicle speed sensor operates. In this case, the signal from the vehicle speed sensor is input to the control unit, the switching valve is operated by the switching control signal from this control unit, and the exhaust pipe pressure larger than the intake pipe pressure is introduced into the actuator, The waste gate valve is opened further to reduce the supercharging pressure, and the deceleration control of the vehicle is reliably performed.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.
In FIG. 1, 2 is an exhaust turbine type supercharger, 4 is an intake passage, 6 is an exhaust passage, 8 is a compressor, and 10 is a turbine. The supercharger 2 is provided in the middle of an intake passage 4 and an exhaust passage 6 that communicate with the internal combustion engine 12, respectively. A compressor 8 is provided so as to face the intake passage 4, the compressor 8 is rotated by a turbine 10 provided so as to face the exhaust passage 6, and supply air is pressure-fed to an internal combustion engine 12.

A bypass passage 14 that bypasses the turbine 10 of the supercharger 2 and connects the exhaust passage 6 is provided. That is, the bypass passage 14 that has an opening 16 at the inlet 16 provided in the upstream exhaust passage 6-1 of the turbine 10 has an opening 18 at the outlet 18 provided in the downstream exhaust passage 6-2 of the turbine 10. A waste gate valve 20 for opening and closing the inlet 16 is provided in the bypass passage 14.

The opening operation of the waste gate valve 20 is controlled by the actuator 22. Actuator 22 is a diaphragm
A pressure chamber 26 is defined by 24. Diaphragm 24
Is connected to the waste gate valve 20 by a rod 28. Wastegate valve 20 through this rod 28
A closing spring 30 for displacing the diaphragm 24 in the contracting direction of the pressure chamber 26 is provided by elastically pressing the diaphragm 24 to close the diaphragm.

Further, an electromagnetic switching valve 34 is provided in the pressure chamber 26 of the actuator 22 via an introduction passage 32, and an intake pipe pressure introduction starting at an opening end of the intake passage 4-2 on the downstream side of the compressor 8 is provided in the switching valve 34. For connecting the first passage 36 for
A second passage 38 for introducing an exhaust pipe pressure, which starts at the opening, is also connected to the upstream exhaust passage 6-1 of the turbine 10.

Further, the switching valve 34 is connected to a control unit 42 which inputs a signal from the vehicle speed sensor 40 and outputs a switching control signal. At this time, the control unit 42, when the vehicle speed becomes equal to or higher than a predetermined speed,
The signal from the vehicle speed sensor 40 is inputted and the introduction passage 32 and the second
A switching control signal is output to the switching valve 34 so as to communicate with the passage 38 and introduce the exhaust pipe pressure into the pressure chamber 26. Reference numeral 44 is a Venturi type carburetor, and 46 is an air cleaner.

Next, the operation will be described.

Normally, the switching valve 34 connects the pressure chamber 26 of the actuator 22 and the downstream side intake passage 4-2 of the compressor 8 to introduce the intake pipe pressure into the pressure chamber 26 via the introduction passage 32 and the first passage 36. Then, the actuator 22 is actuated by the intake pipe pressure against the urging force of the closing spring 30 to open the waste gate valve 20 to control the supercharging pressure, and the required intake pipe pressure durability as shown in FIG. To get

The vehicle speed sensor 40
Is activated, the control unit 42 outputs a switching control signal to the switching valve 34 in response to a signal from the vehicle speed sensor 40, and the switching valve 34 is switched to operate the pressure chamber 26 of the actuator 22 and the turbine.
The upstream exhaust passage 6-1 of 10 is connected, and the exhaust pipe pressure is introduced into the pressure chamber 26 through the introduction passage 32 and the second passage 38,
The actuator 22 is actuated by the exhaust pipe pressure stronger than the intake pipe pressure, the waste gate valve 20 is opened further, and the exhaust pipe pressure endurance as shown in FIG.
As shown by the intake pipe pressure endurance in the figure, the supercharging pressure is reduced and deceleration control is performed.

As a result, when the actuator is operated by the exhaust pipe pressure, the waste gate valve can be further opened, the supercharging pressure can be reduced, and reliable deceleration control of the vehicle can be performed.

In addition, the structure of the control device can be simplified, the manufacture can be facilitated, and the cost can be reduced.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the portions having the same functions as those in the first embodiment will be described with the same reference numerals. The feature of this second embodiment is that an EGR passage 50 is provided in the exhaust turbine type supercharger 2 and a second passage 38 for introducing the exhaust pipe pressure is provided in communication with this EGR passage 50 part. It is in. Note that reference numeral 52
Is an EGR valve, and 54 is a catalytic converter including a three-way catalyst.

That is, as shown in FIG. 3, the intake manifold 56 holding the EGR valve 52 is provided with an outlet port 58, and the outlet port 58 is provided.
The second passage 38 to communicate with the pressure chamber of the actuator 22.
It is configured to introduce the exhaust pipe pressure to 26. Also, the third
As shown by the one-dot chain line or two-dot chain line in the figure, an outlet 58 is provided in the EGR passage 50 or in the EGR valve 52 part,
The second passage 38 for introducing the exhaust pipe pressure may be provided so as to be in communication with each other.

Accordingly, the control device of the present invention can be used in a supercharger having an EGR mechanism, does not require a large design change, can be manufactured at low cost, and has a great versatility of the control device of the present invention, which is practically advantageous.

Also, by providing the intake manifold with an outlet, the temperature of the exhaust gas that uses the exhaust pipe pressure is low, there is no risk of damaging the cutoff valve, and the service life of the switching valve can be extended, which is economically advantageous. Is.

FIG. 4 shows a third embodiment of the present invention.

The feature of this third embodiment is that when a second passage 38 for introducing the exhaust pipe pressure is provided in communication with the upstream exhaust passage 6-1 of the turbine 10 of the exhaust turbine type supercharger 2. , A cooling unit 60 for cooling the exhaust gas introduced in the middle of the second passage 38
Is provided, and the cooling water is circulated in the cooling unit 60, for example.

As a result, the temperature of the exhaust gas using the exhaust pipe pressure can be effectively reduced, there is no risk of damaging the sluice valve, and the service life of the switching valve can be extended, which is economically advantageous. is there.

The present invention is not limited to the above-mentioned first to third embodiments, and various application modifications are possible.

For example, in the first embodiment of the present invention, the exhaust turbine type supercharger having the Venturi type carburetor has been described, but it may be used in a fuel injection type supercharger.

Further, in the third embodiment of the present invention, the cooling section 60 is provided in the middle of the second passage 38. However, the second passage is provided so as to pass through a portion such as a cylinder head having a cooling function, an intake manifold, or a mission case. It is also possible to provide.

Further, in the third embodiment of the present invention, the water cooling type cooling unit 60 is provided in the middle of the second passage 38, but instead of the water cooling type cooling unit 60, a plurality of fins are provided in the outer peripheral portion of the second passage to perform air cooling. A formula cooling unit can also be provided.

〔The invention's effect〕

As described in detail above, according to the present invention, in the control device for the supercharger for a vehicle, which is provided with the waste gate valve and the actuator for opening / closing the waste gate valve, the actuator is provided with the intake pipe pressure and the exhaust pipe pressure. Is installed, a switching valve for switching control to introduce either the intake pipe pressure or the exhaust pipe pressure into the actuator is installed, a vehicle speed sensor for detecting the vehicle speed is installed, and the vehicle speed is equal to or higher than a predetermined speed. In this case, a control unit was installed to input a signal from the vehicle speed sensor and output a switching control signal to the switching valve to introduce exhaust pipe pressure to the actuator. The exhaust pipe pressure stronger than the pipe pressure can be introduced, and the waste gate valve can be opened more to reduce the supercharging pressure. It is those that can be reliably performed. Further, the control device has a simple structure, is easy to manufacture, can be manufactured at low cost, and is economically advantageous.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a schematic diagram of a control device for a vehicle supercharger, and FIG. 2 is a diagram showing a relationship between pressure and vehicle speed. FIG. 3 is a schematic diagram of a control device for a supercharger for a vehicle showing a second embodiment of the present invention. FIG. 4 is a schematic diagram of a control device for a vehicle supercharger showing a third embodiment of the present invention. FIG. 5 is a schematic diagram of a control device for a vehicle supercharger showing a conventional technique. In the figure, 2 is an exhaust turbine type supercharger, 4 is an intake passage, 4-2 is a downstream intake passage of a compressor, 6 is an exhaust passage, 6-1 is an upstream exhaust passage of a turbine, and 6-2 is a turbine. Downstream exhaust passage, 8 compressor, 10 turbine, 12 internal combustion engine, 14 bypass passage, 16 inlet, 18
Is an outlet, 20 is a waste gate valve, 22 is an actuator, 24 is a diaphragm, 26 is a pressure chamber, 28 is a rod, 30 is a closing spring, 32 is an introduction passage, 34 is a switching valve, 36 is a first passage,
38 is a second passage, 40 is a vehicle speed sensor, 42 is a control unit, 44 is a venturi type carburetor, and 46 is an air cleaner.

Claims (2)

[Claims] 1. A control device for a vehicle supercharger, comprising a waste gate valve provided in a bypass passage that bypasses the turbocharger turbine and communicates with an exhaust passage, and an actuator that opens and closes the waste gate valve. A vehicle speed sensor that detects a vehicle speed by providing a passage for introducing the intake pipe pressure and the exhaust pipe pressure in the actuator, and providing a switching valve for performing switching control to introduce one of the intake pipe pressure and the exhaust pipe pressure into the actuator. And a control unit for inputting a signal from the vehicle speed sensor and outputting a switching control signal to the switching valve when the vehicle speed exceeds a predetermined speed to control the switching so as to introduce the exhaust pipe pressure to the actuator. A control device for a vehicle supercharger characterized by the above. 2. The passage for introducing the exhaust pipe pressure is a passage having a cooling part in the middle of the passage when the exhaust pipe pressure is introduced from the exhaust passage to the actuator.
A control device for a vehicle supercharger according to the item.