JPH01117931A - Controller for turbocharger equipped with rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the responsiveness in engine acceleration by installing an accelerating pedal depression detecting means and controlling the electric power supplied into a rotary electric machine which assists the supercharge operation, in correspondence with the pedal depressing speed. CONSTITUTION:As for a turbocharger 6 equipped with a rotary electric machine, a rotary electric machine 7 which can operate as electric motor/dynamo is installed onto a rotary shaft 6c for connecting a compressor 6a and a turbine 6b. In this case, an electronic controller 5 which receives the output signals of an accelerating pedal sensor 2b, boost pressure sensor 1d, etc., calculates the difference between the aimed value of the boost pressure and the actual value. Further, the depressing speed is calculated from the measured accelerating pedal depressing quantity, and if the pedal depressing speed is over a prescribed value, engine acceleration is judged, and the electric power supplied into the rotary electric machine 7 is calculated, and calculation is performed so that a large supplied electric power corresponding to the depressing speed is obtained. An injector 2 and the rotary electric machine 7 are controlled according to the result of the calculations.

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, in which an electric generator is attached to the rotating shaft of the turbocharger driven by exhaust energy.

(Prior Art) Various proposals have been made to recover exhaust energy by attaching a turbocharger to the exhaust pipe of an engine and directly connecting an electric generator to the rotating shaft of the turbocharger.

Japanese Patent Laid-Open Publication No. 2003-19133 proposed that an electric generator is attached to such a turbocharger, and the rotation of the electric generator is controlled by operating the electric motor or generator depending on the operating state of the engine as a turbocharger for an internal combustion engine. 60-1953
It is disclosed in Publication No. 29.

(Problems to be Solved by the Invention) In the above proposal for a turbocharger for an internal combustion engine,
When the engine is operating at low speeds and high loads, the supercharging operation is assisted by the electric motor drive, but there is a problem in that during normal operation, control is not performed depending on the state of depression of the accelerator pedal.

The present invention has been made in view of the above problems, and its purpose is to quickly increase boost pressure to the engine by controlling the electric power supplied to the rotating electric machine in accordance with the position and speed of the accelerator pedal. The purpose of the present invention is to provide a control device for a turbocharger with a rotating electric machine that is intended to be used to raise the temperature.

(Means for Solving the Problems) According to the present invention, there is provided a rotating electrical machine that serves as a motor-generator attached to a turbocharger, and a rotating electrical machine that supplies electric power to the rotating electrical machine to assist in supercharging an internal combustion engine. A control device for a turbocharger with a rotating electric machine having a battery, a depression position detection means for detecting an accelerator pedal depression position, a depression speed detection means for detecting an accelerator pedal depression speed,
There is provided a control device for a turbocharger with a rotary electric machine, characterized in that the control device includes a power control means for controlling power supplied from a battery to the rotary electric machine based on signals from these two detection means.

(Function) In the present invention, when the accelerator pedal depression speed is high, it is determined that the vehicle is rapidly accelerating, and the electric power supplied to the rotating electric machine is increased to rapidly increase the boost pressure of the engine by the turbocharger. It has the effect of improving responsiveness.

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

FIG. 1 is a configuration block diagram showing an embodiment of the present invention. In the figure, 1 represents air taken in by an engine through an intake pipe 1a, and fuel supplied from a fuel tank 2a through an injector 2. The combustion energy rotates the wheels 3 to drive the vehicle, and the exhaust gas after combustion is discharged through the exhaust pipe 1b. 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, and each detects an engine rotation signal, an engine load signal corresponding to the amount of accelerator depression, and signals of the accelerator pedal position and pedal travel amount. It is sent to the electronic control device 5.

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 becomes a generator mode, and the generated power is transmitted to the power converter 7a, and the operation of the power converter 7a charges the on-vehicle battery 5a. .

Note that power converter F a includes a rectifying and smoothing circuit that converts AC power to DC power, a converter circuit that freely converts the voltage of DC power, an inverter circuit that converts DC power to AC power whose frequency can be adjusted freely, and a semiconductor control element. It is equipped with various heavy electric power control circuits such as a duty control circuit that controls voltage and current using the electronic control device 5, and the various heavy electric 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.

18 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 phase detector 7C 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 is a microcomputer, a central processing unit that inputs signals from the various sensors mentioned above and performs arithmetic processing and comparison of counts, and various memory devices that store control programs and various data. It has a person/output device that receives various 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. In addition,
Various memories possessed by the electronic control unit 5 store data such as intake boost pressure commensurate with the amount of fuel supplied corresponding to the accelerator pedal position, data on the engine rotation speed corresponding to the accelerator pedal position, and maps corresponding to these data. has been done.

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

First, in step 1, a signal from the engine rotation sensor IC is read, and it is checked whether the engine rotation is idling. If the engine is not idling, the process proceeds to step 2, and it is checked whether the clutch is engaged or not. Here, when the signal from the clutch sensor 4C is connected, the process proceeds to step 3, and when it is disconnected, the process proceeds to step 4, and the flow of step 2 is repeated.

In step 3, the signal from the accelerator pedal sensor 2b is read, and in step 5, it is checked whether the amount of pedal depression is partially or fully depressed.
In the case of partial depression, the process moves to steps 6 to 9. Then, signals are read from the engine rotation sensor 1c and the boost pressure sensor 1d, and the boost pressure PIIC of the intake pipe corresponding to the fuel supply amount at the partially depressed accelerator pedal position is calculated. and calculate the difference.

In step 10, the depression position of the accelerator pedal 2d is measured based on the signal from the accelerator pedal sensor 2b, and the depression speed vA during the minute time Δ is calculated. Then, in step a, the depression speed vA becomes the predetermined depression speed VAC.
If it is larger than vA, it is determined that the engine is accelerating, and a calculation is performed in step 11 to set the power supplied to the rotating electrical machine 7 to be a large power corresponding to vA. In steps 12 to 14, the turbine rotation speed is detected by the turbine sensor 6d, the duty of the power converter 7a that supplies electric power is controlled based on the calculation result, and the efficiency when driving the electric motor is controlled based on the signal from the phase sensor 7b. The boost pressure increased by the operation of the electric motor is detected in step 15, and control to increase the supplied fuel is performed in step 16.

Note that in step a, the depression speed V is the predetermined depression speed V.
If it is smaller than AC, the process proceeds to step b, where it is compared with a preset required depression speed vAp. Here, V,>VA,
In this case, in step C, the supplied power corresponding to the boost pressure (P ac - Pat) calculated in step 9 is calculated and the process returns to step 10. However, if vA does not reach vAp, the mode is changed to steady mode. After making a judgment, the process moves to step 17.

In step 17, the degree of increase in boost pressure is checked, and if the increase in boost pressure is greater than a predetermined value, in step 18 the accelerator pedal position is determined from the accelerator pedal sensor 2b, and in step 19, the engine rotation is determined from the engine rotation sensor IC. Detect. Then, in step 20, based on these detection signals, it is determined that if the current engine rotation is smaller than the engine rotation corresponding to the accelerator pedal position, the rotating electrical machine 7 is set to the electric motor mode, and if it is larger, the rotating electric machine 7 is set to the generator mode. In the former case, go to step 21,
In the latter case, proceed to step d.

In step 21, the electric power for driving the rotary electric machine is calculated, and in step 22, the turbine sensor 6
The turbine rotation is detected from d, and then steps 23-2
5, the power from the battery 5a is transferred to the power converter 7a.
The fuel is supplied to the rotating electrical machine 7 to drive the motor, and the compressor 6a is operated to perform supercharging and increase the boost pressure.

Then, boost pressure is detected by boost pressure sensor 1d,
Control is performed to increase the driving force of the engine 1 by controlling the injector actuator 2C to control the fuel supply amount.

When the rotating electric machine 7 is set to the generator mode in step 20, the process proceeds to step d, where the electronic control device 5 reads the power generation operation, and the process proceeds from step e to step 26, where the voltage sensor 7C measures the generated voltage. , step 27
Compare it with the battery voltage. When the generated voltage is higher than the battery voltage, the process proceeds to steps 28 to 30 to charge the battery, and when the generated voltage is low, the process proceeds to steps 32 and 33 where the power converter 7a performs step-up control. The battery will be charged, but if the charging state is not reached in step 30, the process will proceed to step 31 and a failure signal will be issued to issue a warning.

On the other hand, if the accelerator pedal 2d is fully depressed in step 5, the process proceeds to steps 38 to 41, where the engine rotation signal is read from the engine rotation sensor IC, and the electronic control device 5 searches for the maximum power to be supplied to the rotating electric machine 7. death,
Turbine rotation is detected from the turbine sensor 6d, and current boost pressure PR2 is detected from the boost pressure sensor 1d. Then, in step 42, the maximum boost and the current boost pressure Pa
2, and if the PI 32 has not reached the maximum boost pressure, go to steps 43 to 46 in 8 lines. Here, control is performed to increase the power supplied to the rotating electrical machine 7 via the power converter 7a, control to efficiently drive the rotating electrical machine 7 by a signal from the phase sensor 7b, and detection of the current boost pressure.
After executing control to increase the supplied fuel, the process proceeds to step 17, where it is checked to what extent the boost pressure has been increased.

Incidentally, even when PN2 has reached the maximum boost pressure in step 42, the process proceeds to the check flow in step 17 in the same manner as above.

Further, when it is determined that the engine 1 is in an idling state based on the signal from the engine rotation sensor 1c in the first step 1, the process moves to steps 34 to 37, and since the exhaust energy is low due to the idling state, the bypass actuator 1e is activated. The turbine 6b is rotated faster by increasing the flow velocity of the exhaust gas, and the voltage sensor 7C checks the generated voltage from the rotating electric machine 7 operating as a generator.The power converter 7a compares the generated voltage with the battery voltage. After controlling the voltage to a level that allows charging, the process proceeds to step 29 to perform a charging operation.

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) According to the present invention, the pedal depression position operated by the driver is provided with a detection means for detecting the depression position of the accelerator and the pedal, and a depression speed detection means for detecting the depression speed from the amount of movement of the pedal depression. The power supplied to the rotating electric machine that assists supercharging operation is controlled according to the speed, so when the pedal depression speed is high, it is determined to be accelerating, and the supplied power is increased to rapidly increase the engine boost pressure, causing the engine to accelerate. This has the effect of improving responsiveness during sudden acceleration.

[Brief explanation of the drawing]

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, 1c... Engine rotation sensor, 1
d... Boost pressure sensor, 2b... Accelerator pedal sensor, 5... Electronic control device, 5a... Battery,
6...turbocharger, 7...rotating electric machine, 7a.
...Power converter. Patent applicant: Isu-X Automobile Co., Ltd. Agent: Minoru Tsuji, patent attorney

Claims (1)

[Claims] In a control device for a turbocharger with a rotating electric machine, which includes a rotating electric machine that serves as an electric generator attached to the turbocharger, and a battery that supplies electric power to the rotating electric machine and assists in supercharging an internal combustion engine, an accelerator pedal is provided. A depression position detection means for detecting a depression position, a depression speed detection means for detecting an accelerator pedal depression speed, and a power control means for controlling power supplied from a battery to the rotating electric machine based on signals from these two detection means. A control device for a turbocharger with a rotating electric machine.