JPH02173323A - Lubrication device for supercharger - Google Patents

Abstract

PURPOSE:To improve the efficiency of an engine through the reduction of the load of an oil feed device, by controlling an oil feed flow regulation mechanism for the supercharger oil feed device on the basis of an engine revolution number and an intaken air amount, and reducing an oil feed amount at the time of a low speed low load operation especially. CONSTITUTION:Exhaust gas discharged from an engine 1 is introduced to a turbine 2, and an impeller 3 formed at one end of a shaft 4 is made to rotate. Meanwhile, air intaken from an air cleaner 6 is introduced to a compressor 8 through an air flow meter 7, and compression is made by means of an impeller 9 formed at the other end of the shaft 4. Also, oil within a pan 11 is sucked by means of a pump 10 driven by the engine 1, and supplied to the bearing portion 5 of the shaft 4 through a passage 16. In this instance, respective detection signals from the air flow meter 7 and an engine revolution number sensor 13 are respectively inputted into a control unit 14. And the pump 10 is controlled through a control means 15 by means of an output from the control unit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to varying the amount of oil supplied to an exhaust turbine supercharger in response to engine operating conditions.

[Conventional technology]

Examples of changing the oil supply pressure of an exhaust turbine supercharger are Utility Model Application No. 61-1.692], No. 3, and Utility Model Application No. 62117.
238 etc., especially 1.723
8, engine operating conditions such as engine speed are detected and the amount of oil supplied is changed. However, the purpose of these structures was to prevent -I-A of the oil supply temperature and to compensate for changes in the oil supply amount due to changes in the oil supply temperature. The purpose was to prevent oil leakage due to excessive oil volume, and the amount of oil supplied was mainly controlled when the engine was operating at high speeds and high loads, and the amount of oil supplied at low speeds and low loads was not controlled.

[Problem to be solved by the invention]

1- In the prior art, no consideration is given to the engine power consumed by the oil supply pump, and when the engine is operating at low speed and low load, the amount of oil required by the exhaust turbine supercharger is refueled. Compared to an engine that does not use a supercharger, the oil bomb consumes more power, which deteriorates engine efficiency at low speeds and low loads.

Especially when a mechanical turbocharger and an exhaust turbine turbocharger are used in combination, the exhaust turbine turbocharger is designed for high speed and high load, so at low speed and low load there is almost no supply or
Even though ll+ is not necessary, the conventional technology performs normal refueling, which deteriorates engine efficiency.

An object of the present invention is to reduce the load on the oil pump of an engine at low speeds and low loads, thereby improving engine efficiency.

[Means to solve the problem]

3-, In order to achieve the objective described in [1], a detection device is installed to detect the operating conditions of the engine, and the required amount of oil for the JJI air turbine supercharger is calculated based on the calculation from the detection device. The amount of oil discharged from the oil supply device is controlled so as to secure at least the required amount of oil, so that the oil supply device does not perform unnecessary work.

2. Also, in order to control the amount of oil supplied at node 11i, the amount of oil supplied is controlled at low speeds and low loads, when the normal amount of oil supplied is much larger than the amount of oil required by the exhaust turbine supercharger. It was made in a similar manner.

3. In order to efficiently reduce the power consumed by the oil supply system,
The reduction in the amount of oil to be supplied is achieved by reducing the load on the oil supply device (for example, by reducing the number of revolutions).

4. In order to easily control the amount of oil supplied, an oil supply amount adjusting mechanism is provided in the oil supply pipe that supplies lubricating oil from the oil supply device to the exhaust turbine supercharger.

5. In order to increase the effect of reducing the power consumption of the refueling system by reducing the amount of oil supplied, the exhaust turbine type supercharger requires less oil when the engine is operating at low speed and low load. This system was adopted in system 11, which uses a supercharger in combination.

6. In order to increase the effect of reducing the power consumption of the oil supply system by reducing the amount of lubricating oil, this system was adopted for a system that uses two exhaust turbine superchargers with a large amount of lubricating oil for the exhaust turbine supercharger. .

[Effect]

The amount of oil required for the exhaust turbine supercharger is calculated based on the signal from the detection means that detects the operating state of the engine, and the amount of oil discharged from the oil supply device is adjusted to supply the amount of oil that ensures the minimum amount of oil required. control.

This allows the power of the refueling system to be kept to a minimum, thereby improving engine efficiency.

〔Example〕

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

Exhaust gas discharged from the engine 1 is introduced into a turbine 2, rotates a turbine impeller 3, and then passes through a muffler and is released into the atmosphere. The turbine impeller 3 is formed at one end of a turbine shaft 4, and the turbine shirts 1 to 4 are rotatably supported by a bearing portion 5 by bearings. On the other hand, the air sucked through the air cleaner 6 is introduced into the compressor 8 through an air flow rate 817. A compressor impeller 9 that is formed at the other end of the turbine shaft 4 and rotates together with the turbine impeller 3 is disposed within the compressor 8, compresses the introduced air, and supplies the compressed air to the engine 1.

Further, an oil pump 10 driven by the engine 1 sucks oil in an oil pan 11, divides the oil passage 16, and supplies the oil to the bearing portion 5. The oil that has lubricated the bearing portion 5 passes through the oil drain pipe 12 and naturally falls into the oil pan 11. In addition, the engine rotation sensor 13 and the air flow rate sensor 1
The signal from 7 is input to the control units 1 to 14, and the first control arrangement 5 controls the discharge amount of the oil pump 10 based on the output from the control units 1 to 14.
Activate.

In this structure, as shown in Fig. 2, the engine speed N is low, and the load calculated from the air flow rate and engine speed (
In the attenuation 21 where Q/N) is small, the rotational speed of the turbine is low, and the amount of oil required by the bearing portion 5 is sufficient compared to the amount of oil supplied to the bearing portion 5 from the oil pump 10 in normal operation. small. In this case, the control unit 1-14 operates the first control means 15 to reduce the discharge amount of the oil pump 10. This reduces the engine power consumed by the oil pump 10. When the engine is operating at low speed and low load, the engine output is small, and a high proportion of the engine output is consumed by the oil pump 10. Therefore, reducing the output of the oil pump in this way is effective in improving engine efficiency.

FIG. 3 shows another embodiment for adjusting the oil flow rate.

An oil flow rate control mechanism is provided in the oil passage 16 for supplying oil from the oil pump 10 to the bearing portion 5, and in this example, the oil pump white can be of normal specifications and is easy to adopt.

FIG. 4 shows another embodiment.

A mechanically driven supercharger 17 driven by the engine 1 is provided downstream of the compressor 8, and the mechanically driven supercharger]-7 is operated and stopped by signals from the control units 1 to 14. Also provided are a bypass passage 19 that detours around the mechanically driven supercharger 17, and a second control means 18 that controls opening and closing of the bypass passage by signals from the control units I to 14. In this structure, the mechanically driven supercharger 17 starts supercharging from a region where the engine speed is low, compresses air taken in from the compressor 8, and supplies the compressed air to the engine 1. In addition, the mechanically driven supercharger 17 is activated when the engine speed exceeds a predetermined engine speed.
The operation is stopped by the signal from 4. On the other hand, the exhaust turbine type supercharger is set to a high-speed type, and the boost pressure is low when the engine speed is low, but as the engine speed increases, the boost pressure increases, and the mechanically driven supercharger It exhibits the best supercharging effect during high-speed operation when the operation is stopped.

At this time, the mechanically driven supercharger 17 stops after operation, and at the same time, the second control means 18 operates to open the bypass passage 19.
Supercharged air from the compressor 8 is supplied to the engine 1 via a bypass passage 19.

With this structure, the rotational speed of the turbine is low except when the engine is being operated at particularly high rotations and high loads, making it possible to reduce the amount of oil supplied in the region 22 shown in FIG.
It is possible to reduce the output of the oil pump and improve engine efficiency in a wider operating range than in the case of a normal turbo engine (region 21).

〔Effect of the invention〕

According to the present invention, the engine power consumed by the oil pump can be reduced by reducing the oil flow rate supplied to the exhaust turbine supercharger when the engine is operating at low speed and low load, thereby improving engine efficiency. It has an improving effect.

In addition, the operating characteristics of exhaust turbine turbochargers used in combination with mechanically driven turbochargers are set for high-speed, high-load operation, so the range in which the amount of oil supply can be reduced is different from that of ordinary exhaust turbine turbochargers. When a feeder is used, the effect is much wider than that when the present invention is applied.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the invention, FIG. 2 is an operation diagram showing an embodiment of the invention, and FIG. 3 is a system diagram showing an embodiment of the invention. FIG. 4 is a system diagram showing another embodiment of the present invention. 1. Engine, 3. Turbine impeller, 5. Bearing section,
7 Air flow meter, 9... Compressor impeller, 10...
... Oil pump, 13. Engine rotation speed detection device, Con I roll unit, 15. First control means, mechanically driven supercharger, - Second control means. Figure 4

Claims (1)

[Claims] 1. A lubricant supply device that supplies lubricating oil from the engine to the exhaust turbine supercharger is provided with a lubricant flow rate adjustment mechanism that can adjust the lubricant flow rate, and a detection system that detects the engine rotation speed and intake air amount. A lubrication device for a supercharger, characterized in that a means is provided, and the oil supply flow rate adjustment mechanism is actuated by a detection signal from the detection means. 2. The supercharger lubrication system according to claim 1, which operates to reduce the amount of oil supplied to the exhaust turbine supercharger when the engine is operating at low speed and low load. 3. The supercharger lubrication system according to claim 1, wherein the oil supply amount is adjusted by changing the driving load of an oil pump of the engine. 4. The supercharger lubrication system according to claim 1, further comprising a flow rate adjustment mechanism provided in the middle of an oil supply passage that communicates the oil pump of the engine with the exhaust turbine type supercharger to adjust the amount of oil supplied. 5. An exhaust turbine supercharger is installed in series on the upstream side of the engine intake passage, and a mechanically driven supercharger is placed on the downstream side. A lubricating device for a supercharger, characterized in that the lubricating device for an exhaust turbine type supercharger is provided with the oil supply amount adjusting mechanism according to claim 1 or 2. 6. The engine is provided with two exhaust turbine superchargers, a first and a second, and an opening/closing device is provided in the exhaust gas passage of the second supercharger, and when the engine is operated at low speed and under low load, the opening/closing device is operated. In a supercharging system in which only the first supercharger is operated and the first and second superchargers are operated when the engine is operated at high speed and high load, the oil supply system for the first and second superchargers is charged. Item 1
A lubrication device for a supercharger, characterized in that it is provided with the oil supply amount adjustment mechanism according to 2.