JPH0223232A - Control device of turbocharger with rotary electrical equipment - Google Patents

Abstract

PURPOSE:To enable precise judgement on failure by checking the supply voltage to a rotary electrical equipment and the work load to judge on failure when the rotary electrical equipment mounted on a rotary shaft of a turbocharger is driven as a motor to assist the supercharging operation. CONSTITUTION:In a turbocharge 2 having a rotary electrical equipment 3 on a rotating shaft 2c connecting a turbine 2b and a compressor 2a, when the rotary electrical equipment 3 is driven as a generator, the generated output is charged in a battery 5, and when the energy of the battery 5 is supplied to the rotary electrical equipment to be driven as a motor, the supercharging operation is assisted. In this case, there is provided an accel sensor 1c for detecting the stepping amount of an accelerating pedal, and an output signal of the sensor is input to an electronic control device 6. According to the detected accel stepping amount, the rotary electrical equipment 3 is driven as a motor, and when the supercharging operation by drive of a motor is assisted, the supply power to the rotary electrical equipment 3 and the workload are checked to judge on failure.

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.

(Prior Art) A turbocharger is attached to the exhaust pipe of an engine, and an electric motor-generator is directly connected to the rotating shaft of the turbocharger to recover exhaust energy.

As a proposal for attaching a motor-generator to such a turbocharger, control of an internal combustion engine turbocharger is possible by operating the motor-generator or operating the motor according to engine speed and load conditions. Proposals for the device have been made, for example, in Japanese Patent Application No. 105981/1981 and Japanese Patent Application Laid-Open No. 60-198.
No. 5329.

(Problems to be Solved by the Invention) In such a proposed turbocharger with a rotating electric machine, generated power is supplied to the electrical load or battery when the motor-generator generator is operating, and the turbocharger is supplied when the electric wj machine is operating. The engine output is improved by assisting the supercharging operation of the engine, but when the boost pressure of the turbocharger is increased in response to changes in the vehicle's driving conditions, the turbocharger is driven to high speed rotation and the turbine There are many opportunities for the blade to break or for foreign matter to get mixed in, but there is a problem in that no countermeasures have been taken to deal with such cases.

Therefore, an object of the present invention is to:
It is an object of the present invention to provide a control device for a turbocharger with a rotating electrical machine that diagnoses the occurrence of a failure such as breakage of a turbine blade or the introduction of foreign matter.

(Means for Solving the Interval M Point) According to the present invention, in the control device for a turbocharger with a rotating electric machine in which an electric generator is provided on the rotating shaft of the turbocharger connected to an exhaust pipe of an internal combustion engine, an accelerator pedal depression amount detection means for an internal combustion engine; a boosting means for driving a rotating electric machine with an electric motor in response to a signal from the detection means to boost the pressure of supercharging air; An object of the present invention is to provide a control device for a turbocharger with a rotating electric machine, which is provided with an abnormality detection means for detecting an abnormality in the turbocharger and diagnosing a failure when the turbocharger is assisted.

(Function) In the present invention, when the electric motor drives the rotating electrical machine of the turbocharger to assist supercharging operation, the electric power supplied to the rotating electrical machine operated by the motor and the amount of work thereof are checked, and if there is an abnormality, it is judged as a failure. There is.

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

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

In FIG. 1, reference numeral 1 denotes an engine that drives a vehicle (not shown) by the combustion energy of air taken in through an intake pipe 1a and fuel supplied through a fuel passage 7a. Exhaust gas after combustion is discharged via 1b. IC is an accelerator sensor that detects the amount of depression of the accelerator pedal, 1d is a load sensor that detects the engine load based on the rack position of the fuel injection pump (not shown) of engine 1, and 1e is a rotation sensor that detects the engine rotation speed. Detected signals are sent to an electronic control unit, which will be described later. A fuel actuator 7 is provided in the fuel passage 7a, and the amount of fuel supplied is controlled by an electronic control device, which will be described later.

2 is a turbocharger connected to the exhaust pipe 1b and the intake pipe 1a, and the turbine 2 is driven by exhaust gas.
A rotary electric machine 3 that operates as an electric motor or a generator is attached to a rotating shaft 2c that connects these components. 1f is a partition wall provided in the exhaust pipe 1b, which is attached to the exhaust passage that drives the turbine 2b and divides the passage into two; an exhaust valve 1g is attached to one passage; When the amount of gas is small, the actuator 1h closes the bypass valve 1g to increase the exhaust gas flow velocity in the other flow path, thereby efficiently driving the turbine 2b at a high speed. Note that 2d is a turbine rotation sensor that detects the rotation speed of rotation @2c.

The rotating electric machine 3 has a rotor 3a and a stator 3b, and when the rotor 3a is rotationally driven by exhaust energy, AC power is generated in the stator 3b and a power converter 4, which will be described later, is generated.
Power is transmitted to the battery 5 via.

Further, when power from the battery 5 via the power converter 4 is supplied to the stator 3b to drive the rotor 3a, the intake air is compressed by the operation of the compressor 2a, and the intake pipe 1
The engine 1 is supercharged via a. In addition, 1j is a boost pressure sensor, and compressor 2a
The supercharging pressure caused by the operation of is detected and transmitted to the electronic control unit 6.

FIG. 2 shows an example of an AC power conversion circuit in the power converter 4, which includes a rectifying and smoothing circuit 4a, a duty control circuit 4b, and a choke circuit 4C1. The alternating current power from the rotating electric machine 3 during operation of the generator is converted into direct current by the rectifying and smoothing circuit 4a, and a predetermined control pulse signal from the T-controller 6 is applied to the base input of the transistor Tr. The effective power value is controlled by using the passing current as a ripple current. Thereafter, power at a desired voltage is supplied to the load via the choke channel.

In addition to the above conversion circuit, the power converter 4 also includes a battery 5.
It also has a converter circuit that converts DC power from the source into AC of a predetermined frequency to drive the rotating electric machine 3, and an inverter circuit that converts DC power to AC power whose frequency can be adjusted freely.The frequency control of the inverter circuit is electronically controlled. It is controlled by commands from the control device 6.

Therefore, AC power from the rotating electrical machine 3 when the generator is operating is converted to direct current by the rectifying and smoothing circuit, and controlled to power suitable for battery charging by the converter circuit and duty control circuit. , DC power from the battery 5 is converted into AC power of a predetermined voltage and frequency by the operation of a converter circuit or an inverter circuit, and is supplied to the stator 3b, which assists the supercharging operation of a turbocharger driven by exhaust energy. It is something.

3c shown in Fig. 1 is an AC voltmeter that measures the terminal voltage of the stator 3b of the rotating electric machine 3, and 4d is a DC voltmeter that measures the DC terminal voltage of the power converter 4.The measured voltages are controlled electronically. Send to device 6.

The electronic control unit 6 is composed of a microcomputer, and is a central processing unit that inputs the operating status of the engine 1 and signals from the voltmeter, performs arithmetic processing, counts the number of control operations, etc., and controls the operating status of the engine according to the depression of the accelerator pedal. Various memory devices that store maps related to required boost pressure and control programs for the operation of rotating electric machines, and input/output devices that receive input from various sensors and issue control instructions to actuators, power converters, etc. etc. Note that 3d is a rotor position sensor that detects the magnetic pole position of the rotor 3a during rotation and is used to control the phase of the power supplied to the rotating electric machine 3.

FIG. 3 is a process flow diagram showing an example of the operation of this embodiment, and the operation will be explained with reference to FIG.

First, in Step 1, check the engine speed using the signal from the rotation sensor 1e, and if it is determined to be faster than the idle speed (for example, 800 RPM or more), check whether the clutch is disconnected (Step 2), and if the clutch is connected, accelerate the engine. Detect the position (step 3). If the accelerator position is partially depressed (step 4), the engine speed (step 5), current boost pressure PB2 (step 6), and accelerator equivalent boost pressure FBI are detected from each sensor. The difference between the equivalent boost pressure FBI and the current boost pressure PB2 is calculated (step 8). When it is determined that the difference between the equivalent boost pressure FBI and the current boost pressure PB2 is larger than the predetermined value A, this means that assistance by electric motor operation is required.
Calculate the power to be supplied to the rotating electric machine 3 necessary for acceleration (step lo), and detect the turbine rotation speed (step 11).
Duty control necessary for increasing the voltage of the supplied power is determined (step 12). Next, the power converter 4 is activated (step 13), the phase of the supplied power is determined by the rotor position sensor, and the inverter provided in the power converter 4 is activated (step 14), so that the rotating electric machine operated by the motor is activated. Increase speed. Next, step 15) detects the boost pressure PB.
The fuel actuator tough is controlled to increase fuel in accordance with the increase in boost pressure (step 16). Then, compare the boost pressure PB with the equivalent boost pressure FBI (
Step 17) If PB > equivalent boost pressure PBI, the accelerator position is detected by the accelerator sensor 1c.Step 18) The engine speed is detected (Step 1
9). Since PB has now exceeded FBI, whether or not the engine torque requires assistance from the electric motor is determined based on the load range stored therein. Step 20
It is checked whether or not the electric motor needs to be operated. If the electric motor is in operation, the process proceeds to step 45; if not, the process proceeds to step 34.

Incidentally, when it is determined in step 9 that the difference between the equivalent boost pressure FBI and the current boost pressure PB2 is smaller than the predetermined value A, the process directly proceeds to step 17 described above.

When it is determined in step 1 that the engine speed is 80 ORPM or less, the process moves to step 21, in which the actuator 1h and bypass valve 1g are activated to accelerate the flow rate of exhaust gas and increase the rotation speed of the turbocharger. Perform bypass control.

Next, step 2 is to measure the voltage V generated by the rotating electric machine 3.
2), the magnitude is compared with the battery voltage vb (step 23). As a result, when v<vb, the boost duty of the high frequency coil is controlled (step 24) to boost the generated voltage V above the battery voltage vb, and then charge the battery.

In addition, when the accelerator is fully depressed in step 4, the process moves to step 25, where the rotation sensor 1e detects the engine rotation speed, and the maximum driving force (maximum boost pressure) of the engine is searched by the CPU (step 26). ,
The rotational speed of the turbine of the turbocharger and the current boost pressure are detected (step 27, 28) and compared with the maximum boost pressure (step 29). If the boost pressure is still lower than the maximum boost pressure, duty control necessary to increase the voltage for driving the rotating electric machine is determined. Here, the power converter is activated (step 30), and the rotor position sensor 3d is
The phase of the supplied power is determined based on the signal from the inverter, and the inverter is operated (step 31). Next, the boost pressure after the rotating electric machine is driven is detected (step 32), the amount of fuel is increased in accordance with the increase (step 33), and the process proceeds to step 17. Note that when it is determined in step 29 that the boost pressure has become greater than the maximum boost pressure, the process similarly moves to step 17.

If it is determined in step 20 that the electric motor is not being driven, the process moves to step 34, where it is checked whether the supercharging operation or the generator operation is performed according to the load zone stored in the storage device.In step 35), it is determined that the supercharging operation is being performed. When this occurs, the power generation circuit is cut off (step 36). When it is determined that the generator is operating, the generated voltage is measured (step 37), and the generated voltage V and the battery voltage vb are compared in magnitude (step 38). If V>vb, perform duty control of the power converter (step 39), turn on the battery charging circuit, and charge the battery (step 40), and check the charging status (step 41), even if charging is in progress. If so, return to step 2 of the start. When charging is not in progress, a failure signal is generated to notify the failure (step 42). Naori>v
If not, measure the generated voltage (Step 43)
After performing duty control in the power converter 4 (step 44), the process proceeds to step 40 described above.

Next, FIG. 3 (part 3) is a process flow diagram for constantly correcting and controlling the relationship between boost pressure and fuel so that a normal air/fuel ratio is maintained, and the process starts from step 20.

That is, when it is determined in step 20 that the electric motor is operating, the process moves to step 45 shown in FIG. 3 (part 3), and the boost pressure Pc corresponding to the accelerator pedal position detected in step 18 is calculated. On the other hand, the fuel flow rate is measured by the load sensor 1d (step 46), and the fuel equivalent boost pressure Pfc is calculated based on this fuel flow rate (step 47). Next, the magnitudes of Pc and Pfc are compared (step 48), and if Pc > Pfc, it is necessary to increase the fuel. Therefore, the fuel actuator 7 is controlled in the direction of increase to correct the flow rate (step 49). The correction equivalent boost pressure (FadJ
1+ΔP) is calculated in step 50. Next, in step 51, the magnitudes of Pc and Fadjl are compared, and Pc<F
If it is adjl, the correction is completed and the process moves to step 55. Note that if Pc≧Fadj1 in step 51, steps 48 to 5 are performed until Pc<Fadjt.
0 is repeated.

On the other hand, if Pc<Pfc in step 48, the process proceeds to step 52, in which the fuel actuator 7 is driven in the decreasing direction to correct the flow rate (step 53), and the boost pressure equivalent to the decrease (FadJ2-ΔP) is calculated. . Then compare the size of Pc and FadJ2 (Step 54)
, Pc <FadJ 2, the correction is completed and the process moves to step 55. In addition, here Pc≧FadJz
If so, step 5 until Pc<FadJ2.
2 to 54 are repeated. As a result of the above, the ratio of air and fuel supplied to the engine is corrected so that the normal air-fuel ratio is always maintained.

Next, the process proceeds to step 55, in which the rotating electric machine is driven by an electric motor to calculate the driving power to assist the supercharging operation, the turbine rotation speed is detected (step 56), and the duty required for voltage increase is determined (step 57). Activate the inverter to adjust the phase and voltage of the supplied power (step 58)
. Next, the boost pressure is detected (step 59), and the amount of fuel is increased in accordance with the increase (step 60).
Control flow returns to step 2.

FIG. 4 is a process flow diagram showing another example of the operation of this embodiment, and the operation will be explained with reference to FIG.

Steps 1 to 20 are the same flow as in the previous embodiment.

Next, the process moves to step 21 to calculate the power supplied to drive the electric motor and detect the turbine rotation speed.Step 22
), the duty at the power converter necessary for increasing the power is determined (step 23), and the inverter is operated to adjust the phase and voltage of the supplied power (step 24). Next, the boost pressure PB2 after assistance is detected (step 25) and compared with the accelerator equivalent boost pressure Pal (step 26).
, FBI>PB2, the fuel flow rate is controlled (step 27) and the process returns to step 15. On the contrary, P B
If l<PB2, the process moves to step 54, which will be described later.

In step 1, the engine speed is 80 ORPM.
If it is determined that the following is true, proceed to step 28,
The steps 28 to 31 are the steps 21 to 2 in FIG.
Same as 4.

Further, when the accelerator is fully depressed in step 4, the process moves to step 33, where the engine rotational speed is detected, and the maximum driving force (maximum boost pressure) of the engine is detected by the electronic control device.Step 34 ), step 35 to detect the rotation speed of the turbocharger turbine.
), the current boost pressure P^ is detected (step 36), and compared with the maximum boost pressure (step 37). If the boost pressure is still lower than the maximum boost pressure, duty control necessary to increase the power supplied to drive the motor is determined. Then, the power converter is operated (step 38), the phase is determined based on the signal from the rotational position sensor, and the inverter is operated (
Step 39). The boost pressure PB increased in step 40 is detected and compared with the boost pressure PA before increasing (step 41). If PB>PA, the fuel flow rate is controlled (step 42) and the process moves to step 17. On the other hand, if PB<PA, the process moves to step 54, which will be described later.

When it is determined in step 20 that the electric motor is not being driven, the process moves to step 43, and the following steps 43 to 53 are the same as steps 34 to 44 in FIG. 3, and the state of charge is checked in step 50. ,Y
If the answer is ES, the process returns to the starting step 2, and if the answer is NO, a failure signal is generated to notify the failure (step 51).

Next, steps 54 to 61 are a control flow for diagnosing a failure of a turbine blade, especially when assisted by electric motor operation to increase the boost pressure, and the flow shifts from step 26 or step 41 to step 54.

First, in step 54, the necessary boost pressure increase value ΔP (i.e., PBI-PB2 or PB-PA) is read, the turbine rotation speed is detected (step 55), and the current supplied to the rotating electrical machine is detected (step 55). 56) Calculate the power value. This electric power value is compared with the pressurizing work amount based on the boost pressure increase value ΔP (step 57), and when the pressurizing work amount is smaller than the calculated electric power value, the average value for several seconds is further detected (step 58). ). Again, compare the magnitude of the electric power value and the pressurizing work (step 59), and if the electric power value is greater than the pressurizing work, it is determined that the turbine blade has failed, and a failure signal is generated.Step 60), the electric switch is turned OFF.
F (step 61). Step 57 or 59
If the electric power value is less than the pressurizing work amount, it is determined that there is no failure, and the control flow returns to the initial step 2.

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, when power is supplied to the rotating electrical machine of a turbocharger to assist supercharging operation, the power supplied to the rotating electrical machine operating the motor and the amount of work thereof are checked. It also has the effect of diagnosing an abnormality by determining it as a failure.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing an embodiment of a control device for a turbocharger with a rotating electric machine according to the present invention, FIG. 2 is a circuit diagram showing an example of a power converter used in this embodiment, and FIGS. The figure is a processing flow diagram showing the operation of this embodiment. 1... Engine, IC... Accelerator sensor, ld-
...Load sensor, 1e... Rotation sensor, 1j... Boost pressure sensor, 2... Turbocharger, 3...
Rotating electric machine, 4... Power converter, 5... Battery, 6
...Electronic control device, 7...Fuel actuator. -a b C ^Me funeral map

Claims (1)

[Claims] A control device for a turbocharger with a rotary electric machine, in which an electric motor-generator is provided on a rotating shaft of a turbocharger connected to an exhaust pipe of an internal combustion engine, comprising means for detecting an accelerator pedal depression amount of the internal combustion engine, and a signal from the detecting means. a boosting means for driving an electric motor of a rotating electric machine to boost the pressure of supercharging air according to the voltage, and an abnormality for detecting an abnormality in a turbocharger and diagnosing a failure when the boosting means drives an electric motor of the rotating electric machine to assist the supercharging operation. 1. A control device for a turbocharger with a rotating electric machine, characterized in that a detection means is provided.