JPS5810115A - Turbocharger - Google Patents

Abstract

PURPOSE:To enhance the response characteristic of a turbocharged engine in a low-speed revolution range, by a method wherein an auxiliary fan driven by a motor is provided on the upstream side of a suction passage of a compressor which is driven by the exhaust gas discharged from the engine. CONSTITUTION:The turbocharger 3 is constituted of a turbine 4 and the compressor 9 which are driven by the exhaust gas discharged from the engine 1. The auxiliary fan 12 driven by a motor is provided in the interior of the suction passage 11. At the time of acceleration, the auxiliary fan 12 is operated to contrive to enhance the response characteristic and raise the supercharging pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turbocharger suitable for automobile engines, particularly small passenger car engines.

Conventional engines equipped with turbochargers have the drawback of insufficient output in the low engine speed range and slow engine response. Especially when driving in urban areas #
In the case of small passenger cars with a high jiFR, the engine spends a long time in the low speed rotation range, and the above-mentioned drawbacks have been a factor that has prevented the spread of turbochargers in small passenger cars.

Methods of energizing the turbocharger by rounding auxiliary means have been proposed to solve the above-mentioned drawbacks of turbocharged engines, but both methods suffer from the drawbacks of being complicated and expensive, making them unsuitable for small passenger cars. It was appropriate.

An object of the present invention is to improve the output of a turbocharged engine in a low speed rotation range and to improve responsiveness.

The present invention is characterized in that an electric motor-driven engine is installed upstream of a suction passage of a compressor that is driven by engine exhaust gas.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
I will clarify. Figure JI1 shows the overall configuration of this implementation area, and the second
The figure is a detailed # side view of the suction flow path including the auxiliary fan.

First, the overall configuration of the first step will be explained.

A turbine casing 4 of a turbocharger 3 is connected to an exhaust gas 12 of the engine 1 . turbocharger 30
A turbine impeller 6 is fixed to one end of the rotating ring 5. A compressor impeller 7 is fixed to the other end of the rotating shaft 6, and together with a congressor casing 8, constitutes a compressor t-9. The discharge port of the compressor te is connected to the intake pipe 10 of the engine 1, and the suction port is connected to the suction passage 11.

An auxiliary fan 12 is provided inside the suction fi path 11. A main flow path 13 is provided outside the auxiliary fan 12 so as to surround the auxiliary fan 12, and is configured to directly guide air from the upstream side of the suction flow path 11 to the compressor 9 of the turbocharger 3. The auxiliary engine 12 mainly includes a casing 14, a DC motor 15, and a centrifugal impeller 16.

A wire 18 from a storage battery 17 is connected to the DC motor 15. A relay switch 19 is provided in the middle of the electric wire 18 and is activated by a signal from a detector 21 of the amount of penetration of the accelerator pedal 2 installed in the driver's seat.

Next, the structure of the suction flow path and the auxiliary fan will be explained in detail with reference to FIG. The external shape of the suction passage 11 is an upstream fluent outer cage/
The upstream outer casing 22 is connected to an air filter (not shown), and the downstream outer casing 23 is connected to the suction port of the compressor t-9 of the turbocharger 3. It is connected.

A support plate 24 is fixed to the outer casings 22 and 23, and an auxiliary fan/12 is fixed to the support plate 24.

A fan casing 25 is fixed to one side of the support plate 24, and a centrifugal blade 1 is mounted inside the fan casing 25.
6 is fixedly arranged on the rotating shaft 26. The space between the fan casing 25 and the outer casing 22 forms an axially symmetrical flow path 27, into which air flows from the upstream side. A suction port 28 opens in the upstream direction in the center of the fan casing 25, and a partition wall 29 is provided between the centrifugal impeller 16 and the support plate 24 to guide the flow to the centrifugal impeller 16. A diffuser 30 fixed to @929 is provided on the outer periphery of the centrifugal impeller 16. An inward flow path 3 is provided between the partition wall 29- and the support plate 24.
0 is formed and II flow motor 1! from the centrifugal impeller 16 through the outlet 31! It guides air to S. dc electric dl
15 is covered with an inner casing 32 fixed to the support I[24, and an axisymmetric flow path 33 is also formed between the inner casing 32 and the outer casing 23, and an axisymmetric flow path on the upstream side - [27 and linked. The casing 34 of the DC motor 15 is fixed to the support plate 24, and is provided with an overhole 3S. A nozzle-shaped outlet 36 is provided on the downstream side of the inner casing 32 and opens toward the downstream direction. Further, on the downstream side of the outer casing 23, a throat 37 is provided where the flow path area is minimal at a position close to the outlet 36, and an enlarged flow path 38 is provided on the downstream side of the throat 37, and the compressor 9 of the turbocharger 3 The suction bone rohe* continues.

Next, the operation of this embodiment will be explained. Exhaust gas from the engine 2 is guided to a turbine casing 4 of a turbocharger 3 through an exhaust pipe 2 and drives a turbine impeller 6.

The turbine impeller 6 rotates the compressor impeller 7 via the rotating shaft 5, and the compressor 9 sucks air from the suction passage 11, increases the pressure, and supplies the air to the carrot 1 through the intake pipe 1G.

When the demand for the output of the engine 1 is low, the amount of depression of the accelerator pedal 20 is small, and the detector 21 detects the amount of depression of the accelerator pedal 20 and turns off the relay switch l to The electric motor 15 is not operated. In this state, the air in the suction channel flows to the turbocharger 3 through the round axisymmetric channels 27 and 33 provided outside the auxiliary fan 12 . A small amount of air is energized through the auxiliary fan 12 which is in a non-operating state, passes through the DC motor 15 and flows out from the air outlet 36 . Since the flow velocity can be lowered by increasing the cross-sectional area of the suction flow path, the fluid loss caused by providing the auxiliary F/12 in the flow path is small.

The accelerator pedal 20 is depressed when the engine 1 is required to have a large output for acceleration. When the amount of depression exceeds a certain value, the detector 21 issues an on signal, and the relay switch 11 is turned on. This allows direct fi@
The motor 15 is activated and its output is transmitted to the centrifugal impeller 16 via the rotary shaft 26'', which immediately enters the rotating state.

When the centrifugal impeller 16 operates, air is sucked in from the suction port 28, is boosted in pressure by the centrifugal impeller 16 and the diffuser 30, is guided into the inside of the DC motor 15 through the inward flow path 30, cools the DC motor 45, and is then heated. The air flows inside the inner casing 32 through the ventilation holes 35, and flows from the outlet 36 as a high-speed airflow toward the suction port of the compressor 9.

Since a throat 37 is provided in the suction passage 11 near the outlet 26 and the area of the passage is minimized, the high-speed airflow from the outlet 36 imparts velocity energy to the air.
Air is sucked through the axially symmetrical flow path te 3 and
Velocity energy is converted into static pressure in the enlarged flow path 38 on the L side.

In this way, a large amount of air is increased in pressure and supplied to the compressor 9 of the turbocharger 3, and the pressure further increases in the compressor 9, so the turbocharger 3
It is possible to achieve high supercharging pressure only when activated. Since such an increase in supercharging pressure occurs at the same time as the DC motor 15 is energized, the responsiveness is significantly improved compared to the case of acceleration using only a turbocharger. When the supercharging pressure is increased by the auxiliary fan 12, the exhaust gas flow rate increases υ, the turbine inlet pressure also increases, so the turbine output increases, and the compressor impeller 70 rotational speed increases Σ, which further increases the supercharging pressure. . Therefore, operation of the auxiliary fan 120 has a synergistic effect on improving responsiveness and increasing boost pressure. Even if the engine 1 is in a high-speed rotation state and the air flow rate becomes large, the air flows through the main channel 13 in parallel with the auxiliary fan 12, so the operation of the auxiliary fan 12 will not become a resistance.

When the output request to the engine /l becomes small and the amount of depression of the accelerator pedal 20 becomes small, the relay switch 19 is turned on according to the signal from the detector 21, and the operation of the p1 auxiliary fan /12 is stopped. As a result, the storage battery 17
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According to this All, there is an auxiliary fan inside the compressor intake R11i of the turbocharger
The structure is such that air flows through the suction flow path and the auxiliary fan in parallel, so the responsiveness and boost pressure of the terminator can be improved with a simplified and low-cost configuration that does not require branch piping or air valves. It's slow to improve.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of an embodiment of the present invention, and FIG. 2 is a detailed sectional view of a suction flow path including an auxiliary fan. 3... Turbocharger, 7... Compressor impeller, 11... Suction channel, 16... Centrifugal impeller, 1
5... DC motor, 36... Air outlet. YJr Eyes ￥32 Figure

Claims (1)

[Claims] L In a turbocharger consisting of a turbine operated by exhaust gas from an engine and a compressor driven by the turbine, an electric motor and an electric motor are installed in a suction passage connected to the suction side of the compressor. A turbocharger characterized by being provided with an auxiliary engine driven by the engine. 2. An air outlet is provided on the discharge side of the auxiliary fan so as to face the downstream side of the suction flow path, and the cross-sectional area of the suction flow path close to the air outlet is configured to decrease toward the downstream side and then expand. The turbocharger according to item 11 above, characterized in that: & The turbocharger according to item 2, characterized in that means is provided for detecting a request for an increase in output to engine/engine, and the auxiliary fan is controlled to operate in a state where the demand for engine/engine output is large.