JPH06323156A - Control device for turbocharger provided with dynamo-electric machine - Google Patents

Abstract

PURPOSE:To prevent a turbocharger from overrunning in a vehicle, running on the high ground, by introducing the atmospheric pressure to a boost compensator to decrease fuel. CONSTITUTION:A turbocharger 2, provided with a dynamo-electric machine 22, is mounted on an intake/exhaust flow path of an engine 1, and a boost compensator 41 for controlling fuel by a charge air pressure is mounted on an injection pump 4. On the halfway of a flow pipe 42 for guiding the charge air pressure, a switching valve 43 switchable to the side of an atmospheric opening pipe 44 is provided, and when an overspeed is detected by a position sensor 23 of the dynamo-electric machine 22, the switching valve 43 is switched to the atmospheric side, to control fuel by decreasing an air pressure to the boost compensator 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a turbocharger with a rotating electric machine, which prevents overrun of the turbocharger in a high altitude of a vehicle equipped with an engine having a turbocharger with a rotating electric machine.

[0002]

2. Description of the Related Art A turbocharger is widely used in which the exhaust energy of an engine is used to drive a turbine, and the turbine torque compresses air to pump intake air to the engine. Then, a rotary electric machine is attached to the turbine shaft of this type of turbocharger, and an attempt is made to increase the engine torque or recover exhaust energy to electric power by electrically driving or rotating the rotary electric machine according to the operating state of the engine. ing.

By the way, when a vehicle equipped with a turbocharger travels in a highland and the atmosphere becomes lean, the load on the turbine is reduced and the rotational speed is increased, which may cause an overrun.

Therefore, as a turbocharger overrun prevention device, Japanese Utility Model Laid-Open No. 4-116635 discloses a device for preventing exhaust of exhaust gas from a waste gate to prevent an increase in rotation speed when the rotation speed is higher than a set value. Has been done.

Further, as a relation of such a prevention device,
There is a fuel injection pump equipped with a high altitude correction device to control the injection amount according to the atmospheric pressure to prevent black smoke in the exhaust, but with a boost compensator that optimizes the fuel according to the supercharging pressure of the turbocharger Need to be placed.

[0006]

In the device disclosed in the above publication, the exhaust gas is released from the waste gate to suppress the rotational speed when the rotational speed of the turbocharger is excessive, but the exhaust energy is released in an energy-saving manner. There is a difficulty in that.

Further, the latter simultaneous installation of the high altitude correction device and the boost compensator becomes complicated, and there is nothing practically used in the current VE type injection pump, and only the boost compensator is installed, which causes overrun in the high altitude. Does not prevent.

The present invention has been made in view of the above problems, and an object thereof is to utilize a boost compensator attached to a fuel injection pump and prevent overrun of a turbocharger by controlling the fuel at high altitude. An object of the present invention is to provide a control device for a turbocharger equipped with a rotating electric machine.

[0009]

In order to achieve the above-mentioned object, according to the present invention, rotation detection means for detecting the rotation speed of a turbocharger and fuel for the engine are controlled according to the supply pressure by the turbocharger. An injection pump equipped with a boost compensator, a switching means for switching the supply pressure introduced to the boost compensator to the atmospheric pressure of the running place, and the switching means for switching the engine to the engine when the signal from the rotation detecting means is excessive. There is provided a control device for a turbocharger with a rotating electric machine, which includes a switching / control means for controlling fuel.

[0010]

[Operation] If the turbocharger speed is too high when driving in high altitude, the supply pressure input to the boost compensator is switched to atmospheric pressure, so the fuel flow rate from the injection pump is reduced and the exhaust gas is reduced. Charger overrun is prevented.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 1 is an engine, and an exhaust pipe 11 and an intake pipe 12 thereof are connected to a turbocharger 2.

When the exhaust gas of the engine 1 is sent through the exhaust pipe 11, the turbine 21 of the turbocharger 2 is driven, the compressor directly connected to the turbine shaft rotates, and the compressed air operates to compress the air. It is pressure-fed as supercharged air to the engine 1 via the intake pipe 12.

Reference numeral 13 is a piston, 14 is a crankshaft, 15 is an exhaust valve, and 16 is an intake valve.

The turbocharger 2 is equipped with a rotary electric machine 22 as an electric motor / generator on the shaft of a turbine 21 and a compressor, which operates as an electric motor or a generator depending on the operating state of the engine 1. A position sensor 23 for detecting the rotation speed and the rotation position of the rotor is attached to the electric machine 22. For example, when the engine 1 has a low rotation speed and requires a high output, a booster 31 and an inverter 32 are provided.
By converting the direct current from the battery 33 into a predetermined alternating current power by the power unit 3 having, and energizing the rotary electric machine 22 by adjusting the phase based on the signal of the position sensor 23, the rotary electric machine 22 is electrically driven to perform the pneumatic operation of the compressor. It is urged to increase the boost pressure to the engine 1.

Reference numeral 4 denotes an injection pump for supplying fuel to the engine 1, which pumps the fuel to an injection nozzle 45 inserted in the cylinder upper part of the engine 1 to inject it into the combustion chamber. Is equipped with a boost compensator 41 for controlling the injection amount according to the supply pressure to the engine 1. Reference numeral 42 denotes a conduit for guiding the supply pressure to the boost compensator 41. In the present embodiment, a switching valve 43 is attached in the middle of the conduit 42, and an open pipe 44 opened to the atmosphere by a command from a controller 5 described later.
It is configured to be switched to the side.

The controller 5 comprises an electronic control unit,
It is provided with a central processing unit for performing arithmetic processing, various memories for storing arithmetic processing procedures and control procedures, and input / output ports. Then, the boost pressure sensor 1 is connected to the input port.
7, position sensor 23 of rotating electric machine, rotation sensor 4
6, the atmospheric pressure sensor 51, the accelerator sensor 52, etc. are connected, and when signals from these various sensors are input, predetermined processing is performed, and the power valve 3 and the switching valve 4 of the conduit 42 are processed.
It is configured so that a control command can be issued to 3 or the like.

Next, the description will be given of the present embodiment configured as described above. The rotational speed of the turbocharger 2 during operation is constantly monitored by the signal from the position sensor 23. Position sensor 23 while traveling in high altitude where atmospheric pressure is low
When the rotation speed signal from the controller exceeds a preset high rotation speed, the controller 5 commands the switching valve 43 provided in the boost compensator 41 to switch to the open pipe 44 side.

Therefore, the boost compensator 41 detects a low atmospheric pressure from the open pipe 44, and the injection pump 4 reduces the fuel flow rate to the engine 1 to suppress the amount of exhaust gas, and therefore the rotational speed of the turbocharger 2. Will be reduced.

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

[0020]

According to the present invention as in the above embodiments,
The rotation signal from the position sensor is always input during traveling, and if the rotation signal becomes excessive during traveling at high altitude, atmospheric pressure is introduced to the boost compensator, so the injection pump reduces fuel to the engine and therefore exhaust gas. This has the effect of preventing overrun of the turbocharger.

Further, in the present invention, the injection pump has only the boost compensator and does not require the high-altitude traveling correction device, so that it is free from complication, and there is an advantage that the exhaust gas is not discharged from the waste gate so that the energy saving is protected.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Turbocharger 3 ... Power part 4 ... Injection pump 5 ... Controller 22 ... Rotating electric machine 23 ... Position sensor 41 ... Boost compensator 42 ... Conduit 43 ... Switching valve 44 ... Opening pipe 51 ... Atmospheric pressure sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02K 23/52 6821-5H

Claims (2)

[Claims] Claim: What is claimed is: 1. A rotation detecting means for detecting the number of revolutions of a turbocharger, an injection pump equipped with a boost compensator for controlling fuel to be supplied to the engine according to the supply pressure of the turbocharger, and a supply pressure introduced to the boost compensator. Is provided to the atmospheric pressure of the traveling place, and a switching / control means for controlling the fuel to the engine by switching the switching means when the signal from the rotation detecting means is excessive. Control device for turbocharger with electric machine. 2. The turbocharger with rotating electric machine according to claim 1, wherein the rotation detecting means is a position sensor for detecting a rotational speed and a rotational phase of a rotating electric machine arranged on a turbine shaft of the turbocharger. Control device.