JPH0512631U - Centrifugal mechanical turbocharger - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a centrifugal mechanical turbocharger capable of increasing the supercharging pressure at low speeds to realize viscous running at low speeds. [Structure] A turbocharger 11 in which a turbine 11t and a compressor 11c are provided on one axis, a planetary gear mechanism 13 attached to the axis, and a crankshaft of an engine rotatably attached to the axis. The pulley 15 is rotated by rotation, and the pulley 15 and the planetary gear mechanism 13 are rotated by an electromagnetic clutch 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal mechanical turbocharger using a turbocharger and a centrifugal mechanical turbocharger together.

[0002]

[Prior Art]

 Conventionally, a turbocharger has been widely known in which a turbine is rotated by energy of exhaust gas discharged from an engine to supercharge the air sucked from an air cleaner into an engine cylinder. There is.

Since such turbocharger uses the energy of the exhaust gas discharged from the engine to perform supercharging, the energy of the exhaust gas is not sufficient at the time of starting acceleration. Due to insufficient supercharging pressure, it was not possible to run at low speed and persistently.

Therefore, in order to sufficiently raise the supercharging pressure at the time of starting acceleration, supercharging is performed by using a roots-type positive displacement mechanical supercharger driven by rotation of the crankshaft of the engine. The supercharging pressure at low speed is increased so that persistent driving at low speed is achieved.

[0005]

[Problems to be solved by the device]

 However, when using a Roots-type positive displacement mechanical turbocharger together, it is necessary to increase the size of the Roots blower in order to obtain a boost pressure suitable for the engine. There is a problem in that the vehicle mountability is deteriorated when the value is increased.

Further, when the size of the roots blower is increased, noise is generated due to airflow noise due to pulsation of the boost pressure because of the positive displacement type, and there is a problem that riding comfort is poor.

The present invention has been made in view of the above points, and an object thereof is to increase a supercharging pressure at a low speed to realize tenacious traveling at a low speed and use a low-noise mechanical supercharger together. It is to provide a centrifugal turbocharger.

[0008]

[Means for Solving the Problems]

 A centrifugal mechanical turbocharger according to the present invention is a turbocharger in which a turbine and a compressor are provided on one shaft, a planetary gear mechanism attached to this shaft, and a rotation on the shaft. A rotating member, which is freely attached and rotated by rotation of the crankshaft of the engine, and clutch means for connecting and disconnecting the rotation of the rotating member and the planetary gear mechanism are provided.

[0009]

[Action]

 At low speeds, clutch means is connected and the turbocharger is driven by rotation of the engine crankshaft.

[0010]

【Example】

 A turbocharger system according to an embodiment of the present invention will be described below with reference to the drawings. 1 is an overall configuration diagram of a centrifugal mechanical turbocharger, FIG. 2 is a flow chart showing the control contents of the system, and FIG. 3 is a map showing the open / closed state of an electromagnetic clutch.

In FIG. 1, 11 is a turbocharger (exhaust turbocharger). The turbocharger has a compressor 11c and a turbine 11t arranged on one axis. Exhaust gas discharged from an engine (not shown) flows in the direction of arrow A to arrow B and is exhausted via a muffler (not shown). The turbine 11t is rotated by the energy of the exhaust gas. Further, the air sucked from an air cleaner (not shown) as shown by arrow C is compressed by the turbine 11c and then discharged in the direction of arrow D.

A sun gear 13 a of a planetary gear 13 is fixed to the rotary shaft 12 of the compressor 11 c, and a pulley 15 is rotatably attached to the rotary shaft 12. The electromagnetic clutch 14 controls the disconnection / connection between the pulley 15 and the internal gear 13a of the planetary gear 13. By the way, a pulley 17 is attached to the crankshaft 16 of the engine, and the rotation of the pulley 17 is accelerated and transmitted to the pulley 15.

By the way, reference numeral 21 is a controller including a microcomputer and its peripheral circuits. Detection signals from an engine speed sensor 22 that detects an engine speed N and an accelerator opening sensor 23 that detects an accelerator opening θ corresponding to an engine load L are input to the controller 21.

Next, the operation of the embodiment of the present invention configured as above will be described. First, the controller 21 reads the engine speed Ne and the accelerator opening θ according to the detection signals from the engine speed sensor 22 and the accelerator opening sensor 23. Then, the electromagnetic clutch 14 is turned on / off based on the engine speed Ne and the accelerator opening degree θ.

That is, when the engine speed Ne is lower than 200 rpm and higher than the reference speed Ne1, the electromagnetic clutch 14 is turned off, that is, disengaged. This is because if the rotation of the crankshaft 16 is transmitted to the planetary gears 13 when the engine speed Ne is lower than 200 rpm, engine stall may occur. Further, when the engine speed Ne is higher than the reference speed Ne1, the supercharging pressure of the turbocharger 11 is sufficiently increased, and it is not necessary to further increase the supercharging pressure.

On the other hand, when the engine speed Ne is 200 rpm or more and is lower than “idle speed Neo-50”, and when the engine speed Ne is “idle speed Neo-50” or higher and lower than engine speed Ne1. Moreover, when the engine load is equal to or higher than Lo, the electromagnetic clutch 14 is turned on (connected), the rotation of the crankshaft 16 is accelerated and transmitted to the compressor 11c via the electromagnetic clutch 14 and the planetary gear 13, and the The bin 11c is actuated by the torque of the crankshaft 16. As a result, supercharging pressure at low speeds is increased, and tenacious running at low speeds is realized.

Although the engine load is detected by the accelerator opening in the above embodiment, the rack position may be detected in the diesel engine.

In the above embodiment, the processing shown in FIG. 2 is performed in a warm air state where the engine cooling water temperature is higher than the set temperature, and when the engine cooling water temperature is the set temperature or lower, the engine speed is the set speed. In the following, the electromagnetic clutch 14 may be connected so that the engine warm-up operation can be executed earlier.

[0019]

[Effect of the device]

 As described in detail above, according to the present invention, it is possible to provide a centrifugal mechanical turbocharger capable of increasing supercharging pressure at low speed to realize viscous traveling at low speed. Wear.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a centrifugal mechanical turbocharger according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the control contents of the system.

FIG. 3 is a map showing an open / closed state of an electromagnetic clutch.

[Explanation of symbols]

11 ... Turbocharger, 12 ... Sun gear, 13 ... Planet gear, 14 ... Electromagnetic clutch, 16 ... Crankshaft, 21 ...
Microcomputer, 22 ... Engine speed sensor,
23 ... Accelerator opening sensor.

Claims (1)

[Scope of utility model registration request] 1. A turbocharger in which a turbine and a compressor are provided on one shaft, a planetary gear mechanism attached to the shaft, and a rotation of an engine crankshaft rotatably attached to the shaft. A centrifugal mechanical turbocharger comprising: a rotating member rotated by the rotating member; and clutch means for connecting and disconnecting the rotation of the rotating member and the planetary gear mechanism.