JPH0577544U - Turbocharging pressure control device for turbocharger - Google Patents

Abstract

(57) [Summary] [Purpose] The supercharging pressure can be set arbitrarily in all operating ranges. In a supercharging pressure control device having a waste gate valve provided in a turbocharger for supercharging an engine, a pressure source 12 for supplying an operating pressure to an actuator 11 of the waste gate valve via a pressure control valve 13. A means 14 for detecting the engine speed, a means 15 for detecting the engine load, a means 16 for detecting the boost pressure, and a control device 17 for controlling the pressure control valve 13 based on these detection signals are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boost pressure control device for a turbocharger.

[0002]

[Prior Art]

 It is equipped with a turbocharger to improve the acceleration and output performance of the engine.

In such a turbocharger, a wastegate valve that responds to the discharge pressure (supercharging pressure) of the intake compressor is provided in a passage that bypasses the exhaust turbine, and when the discharge pressure reaches a predetermined value, By opening the wastegate valve and suppressing the amount of exhaust gas that is introduced from the engine to the exhaust turbine, the supercharging pressure is prevented from becoming excessive (see Japanese Utility Model Laid-Open Nos. 57-167227 and 60-195933).

[0004]

[Problems to be solved by the device]

 However, this would only provide a constant boost pressure characteristic determined by the initial set value, such as the set spring of the actuator that drives the wastegate valve.

For this reason, there is a problem in that supercharging suitable for the entire operating range of the engine cannot be obtained and the output and the like cannot be improved so much depending on the operating range.

The present invention aims to solve such a problem.

[0007]

[Means for Solving the Problems]

 This invention is a turbocharger that supercharges an engine with a wastegate valve provided with a supercharging pressure control device, in which the actuator of the wastegate valve is supplied with an operating pressure through a pressure control valve and an engine rotation speed. A means for detecting the number, a means for detecting the engine load, a means for detecting the supercharging pressure, and a control device for controlling the pressure control valve based on these detection signals are provided.

[0008]

[Action]

 Therefore, by controlling the operating pressure supplied from the pressure source to the wastegate valve actuator via the pressure control valve, based on the engine speed, engine load, and supercharging pressure, the wastegate valve opening can be adjusted arbitrarily. It can be set and the required boost pressure can be obtained in the entire engine operating range.

[0009]

【Example】

 FIG. 1 shows an embodiment of the present invention, in which an exhaust turbine (turbine housing) 10 of a turbocharger is provided with a wastegate valve (not shown) in a passage bypassing the exhaust turbine 10. Is connected to a diaphragm type actuator 11.

A vacuum pump 12 driven by an engine is provided, and an operating pressure (negative pressure) from the vacuum pump 12 is supplied to an actuator 11 of a wastegate valve via a pressure control valve 13. There is.

On the other hand, a rotation speed sensor 14 that detects the rotation speed of the engine, a load sensor 15 that detects the load of the engine, and a discharge pressure, that is, a supercharging pressure of an intake compressor (not shown) of the turbocharger. A pressure sensor 16 for detecting is provided, and these detection signals are input to the control device 17.

Based on these detection signals, the control device 17 controls the pressure control valve 13, that is, adjusts the operating pressure supplied from the vacuum pump 12 to the actuator 11 so as to obtain the boost pressure that matches the operating conditions of the engine. Press to control the opening of the wastegate valve.

In this case, the target supercharging pressure is determined based on the engine speed and the engine load, and the pressure control valve 13 is controlled so that the actual supercharging pressure from the pressure sensor 16 becomes the target supercharging pressure. ..

With such a configuration, the supercharging pressure can be arbitrarily set in the entire operating range of the engine as shown in FIG. 2, and the supercharging pressure suitable for the operating conditions can be obtained.

Therefore, optimum supercharging can always be performed, and the fuel efficiency and output of the engine can be greatly improved.

[0016]

[Effect of the device]

 As described above, this invention is a turbocharger for supercharging an engine, in which a supercharging pressure control device is provided with a wastegate valve, in which the operating pressure is supplied to the actuator of the wastegate valve via the pressure control valve. Since the power source, the means for detecting the engine speed, the means for detecting the engine load, the means for detecting the supercharging pressure, and the control device for controlling the pressure control valve based on these detection signals are provided, The turbocharging pressure of the turbocharger can be set arbitrarily in the entire operating range of the engine, enabling optimum supercharging that matches the operating conditions of the engine.

[Brief description of drawings]

FIG. 1 is a configuration layout diagram.

FIG. 2 is a characteristic diagram of supercharging pressure.

[Explanation of symbols]

 10 Exhaust Turbine 11 Actuator 12 Vacuum Pump 13 Pressure Control Valve 14 Rotation Speed Sensor 15 Load Sensor 16 Pressure Sensor 17 Control Device

Claims (1)

[Scope of utility model registration request] 1. A supercharging pressure control device in which a waste gate valve is provided in a turbocharger for supercharging an engine, a pressure source for supplying an operating pressure to an actuator of the waste gate valve via a pressure control valve, and an engine. A turbo characterized in that it is provided with means for detecting the number of revolutions, means for detecting the engine load, means for detecting the supercharging pressure, and a control device for controlling the pressure control valve based on these detection signals. Supercharging pressure control device for supercharger.