JPH01117932A - Controller for turbocharger equipped with rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent the shortage of the battery capacity by installing a dynamo so as to be connected onto the output shaft of an engine and permitting the electric power to be supplied from the above-described dynamo to a rotary electric machine arranged on a turbocharger in the ascending a steep slope, etc. CONSTITUTION:As for a turbocharger 6 equipped with a rotary electric machine for an engine, a rotary electric machine which can operate as electric motor/ dynamo is installed onto a rotary shaft for connecting a compressor 6a and turbine 6b, and a dynamo 36 which is interlocking-connected with the output shaft of the engine through an electric drive means and a dynamo clutch 35 is installed. The output of the dynamo 36 is supplied as the control electric power through a high frequency transformer 34 and a pulse width modulation controller 33, when the rotary electric machine is operated by an electric motor. The feed of the electric power is controlled by the drive of the dynamo 36 by turning-ON the clutch 35 on the basis of the detection signals of the engine revolution speed and the engine load when the engine is in low revolution speed and heavy load such as in the traveling on a steep slope, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a turbocharger with a rotating electric machine.

(Prior Art) The output of an internal combustion engine is obtained by mixing and combusting fuel and air, so in order to increase the output, it is necessary to pressurize a large amount of air into the cylinder corresponding to the output.

For this reason, recently, turbochargers have been developed that use the energy of exhaust gas to drive a turbine, which drives a compressor that presses supercharged air into a cylinder to efficiently burn fuel. They are increasingly being attached to internal combustion engines.

That is, by attaching a turbocharger to an internal combustion engine, the air filling efficiency can be increased, resulting in higher output and torque, and there are advantages in that fuel efficiency can be improved.

(Problem to be solved by the invention) However, in such a turbocharged internal combustion engine, charging efficiency decreases due to low boost pressure in the low speed rotation range, resulting in insufficient improvement in output and torque. Something happened.

For this reason, small turbochargers are used to improve torque even in low-speed rotation ranges, but with small turbochargers, when the engine is under high load and in high-speed rotation ranges, the turbine reaches the surge line where supercharging is possible. As a result, there was a problem in that the intake air supercharging became insufficient and the starting acceleration and climbing performance deteriorated. Furthermore, since the torque in the low speed range is low, there is a problem in that the degree of freedom in the gear ratio of the transmission is reduced.

Therefore, in order to enable adequate and sufficient intake air supercharging over a wide range from low speeds to high speeds, we have installed an electric motor-generator driven by a turbine. Attempts to make it work have been proposed.

By the way, in vehicles equipped with large internal combustion engines, it is necessary to operate the electric motor-generator as a motor, especially when climbing steep slopes at high speed. There was a problem that the battery capacity was insufficient.

Therefore, the present invention provides a control device for a turbocharger with a rotating electric machine, which aims to solve the problems of the prior art.

(Means for Solving the Problems) In order to achieve the above object, a control device for a turbocharger with rotating electric machine of the present invention is configured as follows. That is,
In a control device for a turbocharger with a rotating electric machine, in which a rotating electric machine serving as an electric generator is attached to the rotating shaft of the turbocharger, a generator is driven by the engine output and supplies electric power to the rotating electric machine, and a rotating machine is used to detect the engine rotation speed. A detection means, a load detection means for detecting the engine load, and a control means for controlling the electric power from the generator to be supplied to the rotating electric machine when the engine is under low rotation and heavy load based on the signals from these two detection means. It is characterized by:

(Saku 7 @) According to the present invention, when the electric motor-generator attached to the turbocharger is operated in electric motor mode, if the engine speed decreases due to climbing a steep slope, etc., the engine generates electricity. Since the motors are connected and power is supplied from the generator to the electric motor, it is possible to avoid inoperability due to lack of battery capacity even on long uphill roads, and stable vehicle running control can be performed.

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

FIG. 4 is a block diagram showing an example of a turbocharger for an internal combustion engine to which the present invention is applied;
1 is an engine that rotates wheels 3 using the combustion energy of air taken in through an intake pipe 1a and fuel supplied from a fuel tank 2a through an injector 2 to drive the vehicle; The exhaust gas after combustion is discharged. The engine 1 includes a clutch 4 that connects and disconnects engine torque by pressing a clutch pedal 4a, and a transmission 4b that changes the engine torque.A clutch sensor 4c is attached to the clutch 4 to detect whether or not the engine torque is connected. , the detected signals are sent to an electronic control device 5, which will be described later. Further, IC is an engine rotation sensor, and 2b is an accelerator pedal sensor attached to the accelerator pedal 2d, which sends a detected engine rotation signal and an engine load signal corresponding to the amount of accelerator depression to the electronic control unit 5, respectively.

A turbocharger 6 is connected to the exhaust pipe 1b and the intake pipe 1a, and has a turbine 6b driven by exhaust gas energy and a compressor 6a that supercharges intake air, and a rotating shaft 6c connecting these two. A rotating electric machine 7 that operates as an electric motor or a generator is attached to the rotary electric machine 7 . When the turbine 6b is rotationally driven by the exhaust energy, the rotating electrical machine 7 enters the generator mode, and the generated power is transmitted to the power converter 7a, and the operation of the power converter 7a charges the vehicle-mounted battery 5a. .

The power converter 7a includes a rectifying and smoothing circuit that converts AC power into DC power, a converter circuit that freely converts the voltage of DC power, an inverter circuit that converts DC power into AC power whose frequency can be adjusted, and a semiconductor control element. The electronic controller 5 is equipped with various heavy-power control circuits such as a duty control circuit that controls voltage and current using the electronic control device 5, and the various heavy-power control circuits are controlled by control commands from the electronic control device 5. Therefore, when increasing the torque of the engine 1, the DC power from the battery 5a is converted and supplied to the rotating electric machine 7, and the compressor 6a is driven in the electric motor mode.
It operates to compress intake air and increase the supercharging pressure to the engine 1.

1e in the figure is a bypass actuator that controls the exhaust flow path to narrow the flow path and increase speed when exhaust energy is small, and 1d is a boost pressure sensor attached to the intake pipe 1a that controls the intake pressure. 6d is a turbine sensor attached to the rotating shaft 6C that detects the rotation speed of the turbocharger 6, and 7b is a phase sensor attached to the rotating electrical machine 7 that detects the difference between the magnetic field of the rotating electrical machine 7 and the output of the rotor. The device for detecting the phase, F C, is a voltage sensor that measures the voltage of the rotating electric machine 7, and the detected signals from each are sent to the electronic control device 5.

The electronic control unit 5 consists of a microcomputer, a central processing unit that inputs signals from the various sensors mentioned above and performs arithmetic processing and comparison of counts, etc., various memory devices that store control programs and various data, and various other components. It has an input/output device that receives signals and issues control commands, and also issues a signal to the injector actuator 2c that increases the amount of fuel supplied to the engine 1. The various memories of the electronic control unit 5 include data on the intake boost pressure commensurate with the amount of fuel supplied corresponding to the accelerator pedal position, data on the engine speed corresponding to the accelerator pedal position, and maps corresponding to these data. etc. are stored.

FIG. 1 is a schematic configuration diagram of the present invention. In the figure, the same components as those explained in FIG. 4 are given the same numbers and detailed explanations will be omitted.

The voltage of the battery 5a is boosted by a booster 31, converted to AC by an inverter 32, and then sent to a turbocharger 6.
Electric power is supplied to the rotating electric machine installed in the rotating electric machine, and as mentioned above, the electronic control device S causes the rotating electric machine to operate as a motor or a generator. A generator/clutch 35 is installed on the output shaft of the engine 1.
A generator 36 is connected through the turbocharger 1, and the generator output is passed through a high frequency transformer 34 and a pulse width modulation (PWM) control device 33 to supply control power to the rotating electric machine provided in the turbocharger 1 when the motor is operated.

With this configuration, in the present invention, when climbing a steep slope at high speed, the engine output shaft and the generator 36 are connected via the generator clutch, and the output of the generator is connected to the rotating electrical machine provided in the turbocharger 6. It is characterized by feeding power to and increasing output.

FIGS. 2 and 3 are flowcharts showing the processing procedure of the present invention. Next, this flowchart will be explained.

First, in step PI, a signal from the engine rotation sensor IC is read and it is checked whether the engine rotation is idling. If the engine rotation is idling, the process moves to steps P2 to P. When the engine is idling, the exhaust energy is low, so the bypass actuator is controlled to increase the exhaust flow velocity and the turbine rotation is accelerated, and the voltage sensor valve C checks the generated voltage vL from the rotating electric machine 7 operating the generator. However, if the generated voltage is higher than the battery voltage V, the high frequency coil is subjected to duty control, and then the process proceeds to step P41, where battery charging control is performed.

If the engine rotation is not idling in step P, the process advances to step P6 to check whether the clutch is engaged or disengaged. Here, when the signal from the clutch sensor 4c is connected, the process moves to step P6, and when it is disconnected, the process moves to step P7, and the process of step P6 is repeated.

In step Pδ, a signal from the accelerator pedal sensor 2b is read, and in step P9, it is checked whether the amount of depression is partial or full. In case of partial depression, step P s
Move to o-P B. (The engine rotation sensor I
C and the boost pressure sensor 1d, calculate the intake pipe boost pressure pat corresponding to the fuel supply amount at the partially depressed accelerator pedal position, and find the difference between the obtained Pal and the current boost pressure PB2.

Next, six lines of processing are performed in steps P14 to PI8.

Here, calculation of the electric power to be supplied to the drive motor (rotating electric machine 7) for increasing the boost pressure required for acceleration, detection of the turbine rotation speed by the turbine sensor 6d, determination of the voltage increase duty, and operation of the voltage increase converter are performed. Then, the phase is determined by the position sensor and processing is performed with the inverter operation.

If the accelerator is fully depressed in the process of step P9, the process proceeds to steps P19 to P22, reads the engine rotation signal from the engine rotation sensor IC, and sets the maximum power to be supplied to the rotating electric machine 7 in the electronic control device 5. The turbine rotation is detected from the turbine sensor 6d, and the current boost pressure is detected from the boost pressure sensor 1d. Then, in step P23, the maximum boost pressure and the current boost pressure are compared, and if the current boost pressure has not reached the maximum boost pressure, step P.

If the current boost pressure has reached the maximum boost pressure, the process proceeds to steps P24 to P27.

Here, the voltage increase converter is operated, the phase is determined by the position sensor, the inverter is operated, the current boost pressure is detected, and the supply fuel is increased.

Next, the boost pressure PR which has increased as the drive motor is controlled by the inverter in step Pie is detected in step Pza, r-, and control is performed to increase the supplied fuel in step P29. And step P.

Then, the degree of increase in boost pressure is checked, and if the boost pressure is above a predetermined value, the generator 36 attached to the engine is controlled as explained in the flowchart of Figure 3.

In FIG. 3, the accelerator positive scene and the engine rotational speed are detected in step P %O*P Sl, and the motor driving force is calculated in step PS2. and step P0
If the engine speed is lower than a predetermined value, for example, 15
If it is not far from 0QRPM, the generator clutch 35 is turned on in step PS4 to connect the generator 36 and the engine output shaft.

That is, when it is detected that the engine speed has decreased due to a steep slope, the generator is energized.
In sa, boosting the voltage, turning on the rectifier circuit, detecting the turbine rotation speed, detecting the generator output frequency, and performing pulse width modulation (PWM) control of the rotating electric machine operating as an electric motor. Then, in step Prill, the turbine rotation speed NTA after PWM control is detected.

Step P@. Then, the turbine rotation speed NT before PWM control
and the turbine rotation speed NTk after PWM control,
If N T < N TA, boost pressure PT2 is detected in step Pill. Then, in step Pa2, the boost pressure PT2 is compared with the accelerator-equivalent boost pressure pHl detected in step P12, and if Ptz>PBs, the process proceeds to step P31 in FIG. 2.

If the determination of N<NTA is negative in step P6°, the process proceeds to step p6s, where the count value NN of the counter is detected. At step P84, count value NN
If it is determined that is larger than the predetermined set value N4, an abnormality signal is generated in step pas. Also, step pa
If the determination of PTjl>Pal is negative in the process of step 2, the count value NP of the counter is detected in step PflB, and if the count value NP is larger than the predetermined value NS in step Pf17, an abnormal signal is generated in step PaM. .

Now, returning to the process in FIG. 2 again, steps p3s to ps
At step P113 in FIG. 3, the engine speed and boost pressure are detected and the fuel flow rate is controlled.
In step P34 and step P3S, if the engine speed is higher than 150 ORMS, the CPU
The rotating electric machine operates as a turbo (T) or as a generator (G).
If it is a turbo operation, the generator relay is cut in step psa. If it is a zero generator operation, the generated voltage is measured in step pay.

Next, the generated voltage vL and the battery voltage V are set at step P3.
If the generated voltage is higher than the generated voltage, the voltage is measured in step P39, the duty of the high frequency coil is controlled in step P40, and the process moves to step P42. Further, in the process of step P3♂, if the batch voltage V is larger than the generated voltage vL, voltage control is performed by duty control of the high frequency coil in step P4□. Then, in step P42, the battery energizing circuit is controlled, and in step P43, it is confirmed that the battery is charged. If the battery is not charged, a failure signal is generated in step P44.

Although the present invention has been described above with reference to the above-mentioned embodiment, 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) As explained above, according to the present invention, a generator is attached to the output shaft of the engine so that it can be connected, and when climbing a steep slope, electric power is supplied from the generator to the rotating electric machine disposed in the turbocharger. Since the engine is supercharged by supplying the battery, the engine output increases and the vehicle can run for a long time without running out of battery capacity, even on long steep slopes, and the vehicle can be controlled to run stably.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of the present invention, FIGS. 2 and 3 are flowcharts, and FIG. 4 is a block diagram. 1... Engine, 5... Electronic control device, 5a...
Battery, 6...turbocharger, 7...rotating electric machine, 36...generator. Patent applicant Isu-X Automobile Co., Ltd.

Claims (1)

[Claims] In a control device for a turbocharger with a rotating electric machine, in which a rotating electric machine serving as an electric generator is attached to the rotating shaft of the turbocharger, a generator driven by the engine output and supplying electric power to the rotating electric machine and the engine rotation speed are detected. a rotation detection means, a load detection means for detecting engine load,
A control device for a turbocharger with a rotary electric machine, comprising a control means for controlling electric power from a generator to be supplied to the rotary electric machine when the engine is under low speed and under heavy load based on the signals from these two detection means.