JPH05180056A - Control device of dynamo-electric machine for turbo - Google Patents

Abstract

PURPOSE:To provide a control device for a dynamo-electric machine wherein control accuracy is improved by correcting nonuniformity of a boost pressure sensor and an atmospheric pressure sensor at power supply riseup time of a control system of the rotary electric machine. CONSTITUTION:In a one-chip microcomputer l which inputs signals from a boost pressure sensor 4 and an atomospheric pressure sensor 5, at riseup time of turning on a power supply of the microcomputer, the atmospheric pressure is measured by both the sensors to compare values thereof and to obtain a deviation, and in the case of a permissible value, the boost pressure sensor is corrected by the deviation. In the case of out of the permissible value, the compared value is compared with the preceding time atmospheric pressure value from a RAM2 provided with a backup circuit 3, and inferiority of these sensors is judged in accordance with comparison to generate an alarm by an alarm output 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a rotary electric machine on a turbine shaft of a turbocharger, and when the supercharging air pressure is not sufficiently obtained depending on the operating state of the engine, the turbocharger is supercharged by electric driving of the rotary electric machine. The present invention relates to a control device for a turbo rotating electric machine that urges operation.

[0002]

2. Description of the Related Art A turbocharger that uses exhaust energy to pump supercharged air to an engine is widely used. A rotary electric machine is attached to the turbine shaft of a turbocharger of this type to rotate the turbocharger according to the operating condition of the engine. Various attempts have been proposed to electrically drive an electric machine or to generate electricity.

As a proposal of this kind, a rotating electric machine is driven based on signals from a means for detecting the number of revolutions of the engine and a means for detecting the load of the engine to control battery charging and engine supercharging. A control device for a turbocharger with a rotating electric machine is disclosed in Japanese Patent Application Laid-Open No. 63-272906.

[0004]

An ordinary control system including the system of the rotating electric machine disclosed in the above-mentioned publication is:
It is composed of a rotating electric machine, its power unit, a controller, etc., and it processes it by the controller according to the state of engine rotation, turbine rotation, supercharging air pressure, accelerator opening, etc. There is.

Then, in order to electrically drive the rotating electric machine to raise the supercharging air pressure, a target boost pressure is set by a data map of the accelerator opening and engine rotation, and electric power is supplied from the power section to obtain the target boost pressure. Although control is performed to bring them closer to each other, the boost pressure is measured by the boost pressure sensor and the atmospheric pressure is measured by the atmospheric pressure sensor. Therefore, if there is a variation in each sensor alone, a slightly offset signal is output. Therefore, there is a problem that the control accuracy is lowered due to the offset amount between the atmospheric pressure sensor and the boost pressure sensor.

The present invention has been made in view of the above problems, and an object thereof is to compare data of a boost pressure sensor and an atmospheric pressure sensor at the time of power-on of a controller for inputting signals from various sensors. However, it is an object of the present invention to provide a control device for a rotary electric machine for a turbo, which attempts to improve the control accuracy by correcting the variation when there are many deviations to reduce the variation.

[0007]

In order to achieve the above object, according to the present invention, at the time of power-on of a control system for electrically driving a rotary electric machine mounted on a turbocharger to increase supercharging air pressure to an engine. In a control device for a turbo rotating electric machine for setting a target boost pressure value based on an atmospheric pressure sensor and a boost pressure sensor in, a backup RAM provided in the control system and storing the atmospheric pressure place at the time of the previous power failure. When the deviations are within the allowable value, the boost sensor is corrected, and when the deviation is within the allowable value, the atmospheric pressure values from the RAM are compared and the measured values are compared according to the comparison value. Correction that issues a warning
There is provided a control device for a turbo rotating electric machine, comprising: a warning unit.

[0008]

According to the present invention, the measured values from the atmospheric pressure sensor and the boost pressure sensor are read and compared when the power is turned on. If the deviation between the two is within the allowable value, the boost pressure sensor is corrected to obtain the target boost pressure. When used for setting, and when the deviation is outside the allowable value, the value from the RAM that stores the previous atmospheric pressure value is compared with the value of the atmospheric pressure sensor, and defectiveness of these sensors is determined according to the comparison value. Judges and issues a warning.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

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

In the figure, reference numeral 1 is a one-chip microcomputer (microcomputer) equipped with an A / D conversion circuit for performing calculation and control according to an input signal, 2 is a RAM, and a power source is backed up by a backup circuit 3. The data from the boost pressure sensor 4 and the atmospheric pressure sensor 5 and the control data map of the engine circuit and the accelerator opening are stored in the memory.

Reference numeral 6 denotes an alarm display, which is an alarm output through the interface when the boost pressure sensor 4 or the atmospheric pressure sensor 5 is defective according to the judgment of the microcomputer 1, and 7 indicates engine start permission. With the output, the start permission is issued when a predetermined condition regarding the operation of the engine is met.

The control of the system in this embodiment will be described below. The following control program is started when the power is turned on.

Start → Initialize → Atmospheric pressure measurement →
Boost pressure measurement → Correction judgment → Alarm judgment → Charge rate determination → Engine start permission → Control boost pressure determination → ……

In this control program, various initializations are first performed when the power is turned on, and the atmospheric pressure by the atmospheric pressure sensor 5 and the pressure by the boost pressure sensor 4 are measured. Then, the deviation between the measured pressure values is calculated, and if the deviation value is within a predetermined ± 20 mmHg, for example, the boost pressure sensor is corrected by the deviation between the two sensors and then based on the battery voltage value. The charge rate is determined and the engine start permission is output.

In this case, when the deviation value of the pressure values from both sensors is ± 20 mmHg or more, the backup R
The atmospheric pressure at the time of the previous power-off is read from AM2 and compared with the current atmospheric pressure. And this deviation is ±
When the pressure is within 20 mmHg, it is determined that the boost pressure sensor 4 is defective, and an output is output to the alarm display 6.

When the deviation value is ± 20 mmHg or more, it is judged that the atmospheric pressure sensor 5 is defective and is output to the alarm display 6. When it is determined that both sensors are defective, the acceleration control based on the boost pressure is stopped, and the acceleration control is performed by the acceleration calculation process by the acceleration sensor or the vehicle speed sensor.

FIG. 2 is a processing flow chart of the main program in the above control, FIG. 3 is a processing flow chart showing a subroutine for checking the atmospheric pressure and boost pressure sensors, and then the processing according to FIG. explain.

At step 1, the atmospheric pressure is measured by the atmospheric pressure sensor 5, and at step 2, the pressure is measured by the boost pressure sensor 4. Then, in step 3, the difference between the numerical values of the two is obtained and determined as the deviation 1, and in step 4, it is checked whether the deviation 1 is zero, and if it is zero, that is, if both values are equal, the main routine shown in FIG. Return to the next flow to proceed to the next flow, but if not equal, proceed to step 5.

Here, it is judged whether or not the deviation 1 is within the range of ± 20 (mmHg), and if it is within the range, the routine proceeds to step 12, where an operation for subtracting the deviation 1 from the boost pressure sensor value is performed. Then, in step 13, the process returns to the main routine.

If the value is out of the range of ± 20 in step 5, the atmospheric pressure at the last power-off is read from the RAM 2,
The difference between this value and the atmospheric pressure measured this time is calculated as a deviation 2 in step 7.

Then, in step 8, the deviation 2 is ± 20 (mm
Hg) range is determined. If it is within the range, the process proceeds to step 14 and it is determined that the boost pressure sensor 4 is defective, and the alarm display 6 is output. Alarm display 6 when it is judged that the barometric pressure sensor 5 is defective
Output to. After the alarm is output, the main routine is returned in any case.

[0023]

As described above with reference to the embodiments, according to the present invention, there is a gap in the control of the rotary electric machine arranged in the turbocharger, and the atmospheric pressure sensor and the boost pressure sensor are activated when the power is turned on to the control system. The detected values are compared, and if the deviation is a permissible value, the boost pressure sensor is corrected, so variations are reduced, and the control of the rotating electric machine performed based on this correction has the effect of obtaining a highly accurate target boost pressure. If the deviation is out of the allowable value, the boost pressure sensor is compared with the current atmospheric pressure value based on the previous atmospheric pressure value by the RAM equipped with the backup power supply, and the deviation is detected. Alternatively, there is an advantage that a warning is given by an alarm by judging a defect of the atmospheric pressure sensor.

[Brief description of drawings]

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

FIG. 2 is a processing flow chart of a main program in the present embodiment.

FIG. 3 is a processing flow chart showing a subroutine for judgment in the present embodiment.

[Explanation of symbols]

 1 ... One-chip microcomputer 2 ... RAM 3 ... Backup circuit 4 ... Boost pressure sensor 5 ... Atmospheric pressure sensor 6 ... Alarm display

Claims (1)

[Claims] 1. A target boost pressure value is set on the basis of an atmospheric pressure sensor and a boost pressure sensor at power-on of a control system for electrically driving a rotary electric machine mounted on a turbocharger to increase supercharging air pressure to an engine. In a control device for a turbo rotating electrical machine, a backup RAM provided in the control system for storing the atmospheric pressure value at the time of the previous power-off and a measured value at the time of power-on of both the sensors are compared and their deviations are compared. Is within an allowable value, the boost sensor is corrected, and if outside the allowable value, a correction / warning means for comparing the atmospheric pressure values from the RAM and issuing a warning according to the comparison value is provided. Control device for rotating electric machine.