JPH03202633A - Control device for turbo-charger with rotary electric machine - Google Patents

Abstract

PURPOSE:To suppress power consumption when the rotation of a turbo-charger is rising by furnishing a speed increasing means for quickening the flow velocity of the exhaust gas on the way of an exhaust pipe leading to the turbo-charger, operating this speed increasing mean prior to current feeding to a rotary electric machine, and by accelerating the turbo-charger. CONSTITUTION:The way of an exhaust pipe 11 communicating between the engine 1 and a turbo-charger 2, wherein a rotary electric machine 3 which works both as a motor and a generator is directly coupled with the rotary shaft of a turbine 21, is divided into a minor pipe 111 and a major pipe 112, and correspondingly a scroll 23 of the turbine 21 is divided into a minor scroll 231 and a major scroll 232. The major pipe 112 is fitted with a valve 7b which is opened and closed by an actuator 71 to control the rate of gas flow, and when this valve 7 is fully closed, all exhaust gas is blown out of the minor scroll 231 to increase the flow velocity of the exhaust gas. When the valve 7 is in full closing motion, i.e., in exhaust speed increasing operation, control shall be made so that it is executed prior to current feeding to the rotary electric machine 3.

Description

Detailed Description of the Invention (Field of Application in Industry A) The present invention relates to a control device for a turbocharger with a rotating electrical machine, which attempts to reduce power supply to a rotating electrical machine during flying boost-up of an engine equipped with a turbocharger with a rotating electrical machine. Regarding.

(Prior art) In recent years, turbochargers have been widely used to recover exhaust energy from the engine and increase supercharging pressure.Furthermore, a rotating electric machine is attached to this turbocharger, and the rotating electric machine can be electrically powered or Alternatively, various proposals have been made for generating electricity.

As a control device for such a turbocharger with a rotary electric machine, there is provided a charging means that operates to generate electricity even when the engine is idling and charges the battery, and a control means that increases supercharging pressure and rapidly accelerates the engine when the engine is running at low speed. Such a proposal is disclosed in Japanese Patent Application Laid-Open No. 1-117925.

(Problem to be Solved by the Invention) By the way, when a gasoline engine is idling, the throttle valve is throttled and the amount of air is small, so the flow rate of exhaust gas is also very small, and the rotation of the turbocharger is stopped. If you attempt to perform a so-called flying boost-up by electrically driving the rotating electric machine attached to the turbocharger in such a state, there is almost no exhaust energy, and the compressor is energized by battery power to increase the supercharging pressure. The power consumption of the rotating electric machine becomes extremely large, and the power supply battery runs out of power.
In other words, there is a problem that the battery runs out.

Furthermore, since the compressor is powered by a battery, its rotational speed increases slowly, and it is also necessary to add a circuit for starting the rotating electric machine.

In addition, in the proposal shown in the above-mentioned publication, a bypass valve in the exhaust flow path and a variable mechanism for the turbine scroll are installed as a countermeasure at idle time, but this measure is not taken to save power when boosting up the flying boost. The problem is that there is no.

The present invention was made in view of such problems,
The purpose is to provide a control device for a turbocharger with a rotating electric machine that reduces the power supply to the rotating electric machine when the engine is boosted up by flying.

(Means for Solving the Problems) According to the present invention, in a control device for a turbocharger with a rotating electric machine, which energizes the rotating electric machine attached to the turbocharger from a battery and increases the pressure of supercharging air before starting the vehicle,
a detection means for detecting depression of an accelerator pedal; a speed increase means for increasing the flow rate of exhaust gas to the turbocharger; and a speed increase means for operating the speed increase means in response to a signal from the detection means to activate the turbo charger before energizing the rotating electric machine. A control device for a turbocharger with a rotating electric machine is provided, which has an acceleration control means for accelerating the engine.

(Function) In the present invention, when a flying boost increase of the engine is detected from the state of the accelerator pedal depression, clutch, gear position, vehicle speed, etc., the exhaust gas is guided to only one of the two divided turbine scrolls to increase its flow velocity. Since the rotation of the turbocharger is urged before the rotating electrical machine is energized, the load on the energized rotating electrical machine becomes lighter, and therefore the power supplied from the battery can be saved.

(Example) Next, an example of the present invention will be described in detail using the drawings.

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

In the figure, 1 is an engine, and a turbocharger 2 is connected to an exhaust pipe 11 and an intake pipe 12 of the engine. The compressor 22 is driven by torque, and the compressor air generated by the operation of the compressor 22 is supplied to the engine 1 through the intake pipe 12 as supercharging air.

23 is a scroll of the turbine 21, and the scroll 23 is divided into a small scroll 231 and a large scroll 232.
On the other hand, a small vibrator 111 is inserted from the middle of the exhaust pipe 11.
and a large vibrator 112, each of which is connected to the two divided scrolls described above. A valve 7 for controlling the gas flow rate is disposed in the large pipe 112, and the exhaust gas flow rate communicating with the large scroll 23 is controlled by opening and closing the valve actuator 71. Therefore, when the valve 7 is fully closed, all the gases exhausted by the engine 1 are blown out from the small scroll 231 via the small vibrator 111, and even when the amount of exhaust gas is small, such as when idling, the gas flow rate increases and the turbine 21 It rotates and drives.

Reference numeral 3 denotes a rotating electric machine serving as a motor-generator, and its rotor is directly connected to the rotating shaft of the turbine 21 . When the exhaust gas energy from the engine 1 is large, the compressor 22 is driven by the turbine torque to increase the boost pressure, and the rotor is also driven to operate the rotating electrical machine 3 as a generator, converting the exhaust energy into electrical energy. It is to be collected. Further, when the engine 1 suddenly starts or when the engine 1 is running at a low speed and under a high load, the rotary electric machine 3 is operated as an electric motor by supplying electric power, and its torque drives the compressor 22 to supply pressurized air to the engine 1. Note that 13 is a boost pressure sensor that detects the pressure of supercharging air to the engine 1 and transmits it to the controller 4.

14 is a clutch sensor provided on the clutch that turns on/off the torque of the engine 1; 15 is a gear position sensor provided on the transmission that changes the engine torque; 16 is a vehicle speed sensor that detects vehicle speed; signals from these sensors is controller 4
connected to input.

Reference numeral 5 denotes an accelerator pedal, which is provided with a depression amount sensor 51 serving as a detection means for detecting the amount of depression of the pedal, and is wired so that a signal from the depression amount sensor 51 is inputted manually to the controller 4.

Reference numeral 6 denotes a battery, which stores the generated power from the rotating electric machine 3 during power generation operation via the power converter 61, and also uses the power from the battery 6 to rotate when the engine 1 suddenly starts or when a low speed and high load occurs. The compressor 22 is driven electrically by the electric machine 3.
This is to supercharge the engine 1 with pressurized air. In addition,
A frequency signal corresponding to the back electromotive force of the stator is input from the rotating electric machine 3 to the controller 4, and the rotation speed of the turbocharger 2 can be detected based on this signal.

The power converter 61 is composed of an AC/DC bidirectional converter having an inverter and a converter, and converts the AC output of the rotating electric machine 3 during power generation into DC power for charging the battery 6 manually, or converts the power of the battery 6 into rotating power. When supplied to the electric machine 3, the DC power is converted into predetermined AC power according to a signal from the controller 4.

The controller 4 is composed of a microcomputer, and is equipped with a central control unit that performs arithmetic processing, various memories that store arithmetic processing procedures and control procedures, human/output circuits, etc., and the input circuit includes signal lines of the various sensors mentioned above. is connected, and a command line to the power converter 61 is connected to the output circuit.

When signals from the depression amount sensor 51, clutch sensor 14, gear position sensor 15, vehicle speed sensor 16, etc. are input, commands are issued to the power converter 61, valve actuator 71, etc.

FIG. 2 is a processing flow diagram showing an example of the operation of this embodiment, and the operation will be explained using this figure.

First, when the driver depresses the accelerator pedal 5,
In step 1, the signal from the depression amount sensor 51 is checked, and if the engine is idling, the process proceeds to step 2, where the signal from the clutch sensor 14 is read. If the clutch is off and the signal from the gear position sensor 15 indicates the first speed, the process proceeds from step 3 to step 4, where the signal from the vehicle speed sensor 16 is checked.

If the vehicle speed is less than 5 km/h in step 4, proceed to step 5, and before energizing the rotating electrical machine 3 with N=1,
The valve actuator 71 is commanded to close the valve 7 to close the flow path to the large scroll 232, guide the exhaust gas only to the small scroll 231 to increase the flow velocity, and the turbine 2
1 (step 6).

Therefore, when the engine is idling and the amount of exhaust gas is at least, the exhaust flow path is narrowed by the small scroll 231, so the turbocharger 2 is energized, and then in step 7, the electric power from the battery 6 is The power converter 6
1 to the rotating electrical machine 3, and drives the compressor 22 more strongly to increase the supercharging pressure to the engine 1,
Perform a flying boost up operation.

Then, in step 8, set N=N+1, and in step 9,
The vehicle speed is checked by the vehicle speed sensor 16, and the vehicle speed is 5 km.
m/h or more, in step 10, the valve actuator 71 is commanded to open the valve 7, the exhaust gas is also passed to the large scroll 232, and the power to the rotating electric machine 3 is cut off to stop the flying boost up. do. After this, normal turbocharger control is performed (step 11.12). In addition, step 1
, 2, 3.4, if No, step 16
After waiting for a while, return to step 1 and repeat the flow.

If the vehicle speed does not reach 5 km/h in step 9,
Proceed to step 13, compare N with the coefficient N' for a predetermined time to sustain the flying boost up, and if N does not reach N'', return to step 8 and repeat the above steps, and if N'' is reached. Since the vehicle speed does not increase,
Step 14] Proceeding to Step 5, the valve 7 is controlled to open so that the exhaust gas is also communicated to the large scroll 232, and the electric power to the rotating electric machine 3 is cut off to cancel the flying boost-up operation.

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

(Effects of the Invention) According to the present invention, when flying boost up is detected from the depression of the accelerator pedal or the state of the clutch, gear, vehicle speed, etc., the exhaust gas is guided only to one of the two divided turbine scrolls to increase the flow velocity. Since the turbocharger is driven before energizing the rotating electrical machine, when the rotating electrical machine is electrically driven in the case of flying boost up,
This eliminates the consumption of large amounts of power when the turbocharger starts to rotate, and the compressor speed quickly increases due to the exhaust energy and the torque of the rotating electric machine, which quickly increases the supercharging pressure to the engine. is obtained.

Therefore, the power consumption of the power supply is reduced and the problem of battery life is resolved, and since the startup of the Zarasha turbocharger is driven by exhaust energy, there is also the advantage that there is no need for a starting circuit for the rotating electric machine. .

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
The figure is a processing flow diagram showing an example of the operation of this embodiment. 1...Engine, 2...Turbocharger, 3...
・Rotating electric machine, 4... Controller, 5... Accelerator pedal, 6... Battery, 7... Valve, 11...
-Exhaust pipe, 23...scroll, 51...depression amount senna.

Claims (2)

[Claims] (1) In a control device for a turbocharger with a rotating electric machine that energizes a rotating electric machine attached to the turbocharger from a battery and increases the pressure of supercharging air before starting the vehicle, a detection means for detecting depression of an accelerator pedal; The turbocharger is characterized by comprising a speed increasing means for accelerating the flow rate of exhaust gas to the charger, and an acceleration control means for operating the speed increasing means in response to a signal from the detecting means to accelerate the turbocharger before energizing the rotating electric machine. A control device for a turbocharger with a rotating electric machine. (2) The control device for a turbocharger with a rotating electrical machine according to claim (1), wherein the speed increasing means divides the turbine scroll of the turbocharger into two and guides exhaust gas to only one side to increase the flow velocity. .