JPH0357824A - Control device of turbocharger - Google Patents

Abstract

PURPOSE:To ensure stable idle operation by supplying the outside air directly to a throttle valve only at the time of flying boost up in which a rotary speed of a compressor is increased by actuating a rotary electric machine of a turbosupercharger as an electric motor. CONSTITUTION:Each detection signal from an engine speed sensor 61, clutch sensor 62, gear shift sensor 63, car speed sensor 11 and a throttle sensor 71 or the like is respectively input to a controller 6, and an engine 1 is judged with its operation in an idle condition and at the time of flying boost up, in which a rotary speed of a compressor 22 is increased, respectively. In accordance with these judging results, while respectively opening a bypass valve 41 and an intake bypass valve 82, an intake path valve 15 is closed. Thus by supplying air from an air cleaner 8 to the engine 1 through an intake bypass path 81, idle operation is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a turbocharger control device that controls the operation of a turbocharger in which an electric mechanism is attached to a turbine shaft.

(Prior art) A supercharger uses exhaust energy to guide the exhaust gas emitted by an engine to a turbine and rotate it at high speed, and to drive the compressor by placing it on the rotating shaft of the turbine to supercharge the intake air of the engine. It has been known since ancient times.

Various proposals have been made to attach an electric mechanism that serves as an electric generator to the turbine shaft of this type of exhaust turbine-driven supercharger, and to operate the electric mechanism as an electric motor or a generator depending on the operating state of the engine. being done.

On the other hand, in a turbocharger equipped with such an electric mechanism, the rotation speed of the compressor is separately increased to increase the boost pressure to the engine, regardless of the operating state of the engine.

This is called flying boost up, and for example, although the engine speed is idling, it is determined that the vehicle is about to start based on the transmission control system, clutch operation system, etc., and the turbocharger is activated. In an attempt to eliminate the turbo lag during acceleration, the engine was energized to drive the engine at high speed and the boost pressure was increased.

FIG. 3 is equipped with a turbocharger 2 that drives a turbine 21 with the exhaust energy of the engine 1 and pumps supercharged air through a compressor 22, and also attempts to send a part of the pressurized air from the compressor 22 to the turbine 21. , is a block diagram of a so-called short loop system.

In such a system in which the bypass pipe 4 is provided between the outlet of the compressor 22 and the inlet of the turbine 21, when the throttle valve 7 is throttled and the engine 1 is idling, the valve 41 of the bypass pipe 4 is closed and the turbo is turned off. If the rotary electric machine 3 of the charger 2 is operated as an electric motor and the pressure inside the intake pipe is increased by the compressor 22, pre-compressed air will be supplied to the engine 1 by opening the throttle valve 7 when the engine suddenly accelerates. As a result, the rotational speed of the engine 1 increases rapidly.

(Problems to be Solved by the Invention) In the system shown in FIG. 3 above, when the engine 1 is in an idling state and the amount of intake air is small, the air flow rate of the compressor 22 is also small, and there is a risk that the air will reach the surge line. However, by opening the valve 41 of the bypass pipe 4, pressure from the compressor 22 flows into the turbine 2l,
The air flow rate increases and the surge in the compressor 22 is avoided. However, on the other hand, the problem is that the pressure in the intake pipe from the compressor 22 to the throttle valve 7 increases, and although the throttle valve 7 is throttled, some of the pressure air flows into the intake manifold, resulting in an increase in the idle speed. will occur.

The present invention was made in view of such problems,
The purpose of this is to control the turbocharger control device, which attempts to suppress fluctuations in the engine's idle speed even when pressure from the turbocharger is applied to the intake pipe during idle driving with the throttle valve throttled to suppress intake air to the engine. It is about providing.

(Means for Solving the Problems) According to the present invention, the rotating electrical machine provided in the turbine glaze of the turbocharger can be electrically powered! In the turbocharger control device that drives the IJ engine and controls the opening and closing of the bypass passage that communicates the compressor outlet and turbine inlet to improve the rapid acceleration of the engine, air is supplied directly from outside to the throttle valve only when flying boost is increased. A control device for a turbocharger is provided that includes an intake bypass flow path for supplying air.

(Function) In the present invention, a bypass flow path that communicates the outlet of the compressor with the intake air of the turbine and an intake bypass flow path from the air cleaner to the throttle valve are provided, and the rotating electric machine of the turbocharger is electrically driven to flow the bypass flow. Until the flying boost-up operation is started by increasing the boost pressure in the intake pipe, the valve in the intake pipe is closed to prevent the boost pressure from reaching the throttle valve, and the intake bypass flow from the air cleaner to the throttle valve is closed. Air is drawn into the engine through the duct to maintain a stable engine speed during idle operation, and the turbocharger's bypass passage sends pressurized air from the compressor to the turbine to increase the pressure at the compressor outlet. (Example) Next, an example of the present invention will be explained in detail using the drawings. FIG. 1 is a block diagram showing the structure of an embodiment of the present invention.

In the figure, reference numeral 1 denotes an engine, which drives the vehicle using the combustion energy of supplied fuel, and is equipped with a rotation sensor 11 for detecting the engine rotation speed.

Reference numeral 2 denotes a turbocharger, which includes a turbine 21 driven by the energy of exhaust gas discharged from the exhaust pipe 12 of the engine 1, and a compressor 22 driven by the turbine torque to forcefully send intake air to the engine 1 through the intake pipe 13. A rotating electric machine 3 serving as an electric motor generator is attached to a rotating shaft 23 that connects the filter bin 21 and the compressor 22 as an electric mechanism.

When the engine 1 is rotating at low speed and under a high load, power is supplied to the rotating electric machine 3 to operate as an electric motor, increasing the rotation speed of the compressor 22 and assisting its supercharging operation to increase the engine output. On the other hand, when the engine 1 is rotating at high speed and the exhaust energy is large, the rotating electric machine 3 is operated as a generator to convert the exhaust energy into electric power and charge the battery 5.

Reference numeral 4 denotes a bypass pipe, which is piped between the outlet of the compressor 22 and the inlet of the turbine 21, and short-circuits and guides the pressure air from the compressor 22 to the turbine 21. A bypass valve 41 is arranged in the middle of the bypass pipe 4. has been done. Normally, the bypass valve 41 is closed and the exhaust gas from the engine 1 is guided to the turbine 21.
Pressure air from the compressor 22 is supercharged to the engine 1 via the intake pipe 13, but when the bypass valve 41 is opened, a part of the pressure air from the compressor 22 is transferred to the turbine 21.
The rotation of the turbine 21 is energized, and the air flow rate of the compressor is increased.

7 is a throttle valve, which connects the intake pipe 13 from the compressor outlet of the turbocharger 2 and the intake manifold 1.
4, and controls the amount of intake air into the engine 1 by controlling the opening and closing of the throttle valve 7, thereby controlling the engine output. Therefore, if the throttle valve 7 is throttled to control the intake air of the engine 1 to a small predetermined amount, the engine 1 will perform idle link operation. Note that 71 is a throttle sensor that detects the opening degree of the throttle valve 7 and sends an output signal to the controller 6.

Reference numeral 81 denotes an intake bypass passage, which is an intake passage that communicates between the air cleaner 8, which serves as the air intake port of the compressor 22 of the turbocharger 2, and the intake pipe in which the throttle valve 7 is disposed. An intake bypass valve 82 is installed to control the opening and closing of the passage 81.

Note that 15 is an intake path valve, which is an on-off valve provided immediately downstream of the branch point of the intake pipe 13 from the compressor outlet to the pipe bus pipe 4. and the intake path valve 1
5, all the pressurized air from the compressor is guided to the exhaust system of the engine 1 via the bypass pipe 4, and the intake air that reaches the engine 1 is guided from the air cleaner 8 via the intake bypass passage 81 and the intake bypass valve 82. It is supplied in the direction of the slotted P valve 7.

Next, 5 is a battery, which is installed in the vehicle and serves as a power source for auxiliary equipment and the rotating electric machine 3 during electric operation, and
When the rotating electric machine 3 generates electricity, it is charged by the generated power.

6 is a controller, consisting of a microcomputer;
It is equipped with a central control unit that performs arithmetic processing, various memories that store arithmetic processing procedures and control procedures, and human/output ports. Signal lines from a rotation sensor 11 of the engine 1, a clutch sensor 61 that detects clutch engagement/disengagement, a gear position sensor 62 that detects the gear position of the transmission, a vehicle speed sensor 63 that detects vehicle speed, a throttle sensor 71, etc. is connected to a human-powered boat, and when the signals from these sensors are input manually, predetermined processing is performed according to the procedure stored in the memory, and the bypass valve 41 and intake path valve 1 are
5. Opening/closing control commands are issued to the intake bypass valves 82, respectively.

Next, the operation of this embodiment configured in this manner will be explained. When the operating state of the engine 1 is determined to be normal based on detection signals from the rotation sensor 11, clutch sensor 61, gear position sensor 62, vehicle speed sensor 63, etc., the bypass valve 41 and the intake bypass valve 82 are closed. At the same time, the intake passage valve 15 is opened to allow pressurized air from the compressor 22 of the turbocharger 2 to flow into the engine 1 via the intake pipe 13 according to the opening degree of the throttle valve 7, thereby operating the engine. If it is determined from the signal 71 that the machine is in an idle state, and that it is time to increase the flying boost by energizing the rotating electrical machine 3 and operating the motor to increase the compressor outlet pressure, the bypass valve 41 and the intake bypass valve 82 are controlled to open, and the intake passage is closed. Valve 1
Close 5. The intake air to the engine 1 via the throttle valve 7 is introduced into the engine 1 from the air cleaner 8 via the intake bypass passage 81 regardless of the operation of the compressor 22, so that the engine 1 can maintain a stable rotational speed in an idle state. will be retained.

On the other hand, the pressure air from the compressor 22 is transferred to the intake path valve 1
Since 5 is closed, it is not supplied to the engine 1, and the bypass pipe 4
By increasing the driving force of the turbine 21, the rotational speed is increased, and the pressure at the outlet of the compressor is further increased, thereby increasing the effect of flying boost.

In addition, the figure 5'l shows the above-mentioned normal operation of the engine,
FIG. 4 is a diagram showing the opening and closing states of the bypass valve 41, the intake bypass pulp 82, and the intake path valve 15 when performing flying boost-up.

Although the present invention has been described above with reference to the above embodiments, various modifications can be made within the scope of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, a bypass pipe equipped with a bypass valve is provided between the compressor outlet and the turbine inlet of the turbocharger, and an intake bypass having a valve intermediately between the throttle valve and the air cleaner When increasing the flying boost of the engine, the rotating electric machine of the turbocharger is operated electrically to open the bypass valve of the bypass pipe to increase the pressure at the compressor outlet, and the intake air to the engine is passed through the valve of the intake pipe from the turbocharger. is closed and the air directly from the air cleaner is taken in through the intake bypass passage to perform idle operation, which has the effect of maintaining stable idle rotation without being affected by the pressure of the turbocharger. When the compressor pressure is sent to the turbine and energized, the air pressure at the compressor outlet increases, so when the engine accelerates, the increased pressure is suddenly supplied to the engine, resulting in excellent response. There are advantages that can be obtained.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a diagram showing the opening and closing states of three types of pulp during normal operation of the engine and when executing flying boost up, and Fig. 3 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a block diagram of a control device. 1...Engine, 2...Turbocharger, 3...
- Rotating electric machine, 4... Bypass pipe, 6... Controller, 7... Throttle valve, 8... Air cleaner, 15... Intake path valve, 21... Turbine, 22
... Compressor, 41 ... Bypass valve, 81
...Intake bypass path, 82...Intake bypass valve.

Claims (1)

[Claims] Flying Boost Up is a turbocharger control device that drives the rotating electric machine installed on the turbine shaft of the turbocharger, and also controls the opening and closing of the bypass passage that communicates the compressor outlet and turbine inlet, improving the rapid acceleration of the engine. A control device for a turbocharger, characterized in that an intake bypass flow path is provided that supplies air directly from outside to a throttle valve only when the throttle valve is in use.