JPH04232331A - Control device of turbo charger with motor - Google Patents

Abstract

PURPOSE:To correct target boost pressure in accordance with atmospheric pressure at a travelling point when travelling on a highland in the case of controlling a motor arranged on a turbo charger and aiding supercharging actuation. CONSTITUTION:The driving condition of an engine 1 is detected by an engine rotation sensor 17 and an acceleration sensor 22, and target boost pressure gained from a storage map of a controller 5 in accordance with signals from these sensors is corrected in accordance with a difference between practical atmospheric pressure gained by an atmospheric pressure sensor 51 and standard atmospheric pressure, and supercharging aiding actuation of a motor 4 is controlled so that it comes to be this corrected target boost pressure, and travelling on a highland is carried out by supplying it to the engine 1.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a turbocharger equipped with a rotating electrical machine, in which a rotating electrical machine is attached to the rotating shaft of the turbocharger, and the assisting operation of supercharging air by the rotating electrical machine is controlled according to the operating conditions of the engine and the atmospheric pressure of the place where the engine is running. The present invention relates to a control device.

0002

[Prior Art] Turbochargers are widely used in which the exhaust energy of an engine rotates a turbine, and the turbine torque drives a compressor to forcefully deliver supercharged air to the engine.The rotation shaft of this type of turbocharger is Various proposals have been made to attach a rotating electric machine to the engine and operate it electrically driven or generated depending on the operating state of the engine.

[0003] As a control device for such a turbocharger with a rotating electrical machine, the rotating electrical machine is controlled based on engine speed, accelerator pedal depression amount, intake boost pressure, etc., in accordance with the operating state of the engine. The proposal is disclosed in Japanese Unexamined Patent Publication No. 1-100318 filed by the present applicant.

0004

[Problems to be Solved by the Invention] In the proposal shown in the above-mentioned publication, the engine is operated based on the differential pressure between the target boost pressure obtained from the engine speed and the amount of accelerator pedal depression and the actual boost pressure. The engine is controlled to an appropriate operating state by determining the state and, for example, in the case of acceleration, supplying electric power to the rotating electrical machine in accordance with the differential pressure and assisting supercharging operation.

[0005] In this case, the above-mentioned target boost pressure is set by the boost pressure measured in advance on the engine bench, but since this value is measured in absolute pressure, it is not measured when driving at high places with low atmospheric pressure. The pressure becomes low, which causes the inconvenience of operating the rotating electrical machine with more power than necessary.

The present invention has been made in view of these problems, and its purpose is to provide a control device for a turbocharger with a rotating electrical machine that appropriately controls the rotating electrical machine even when traveling at high altitudes. be.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a rotating electric machine disposed in a turbocharger to assist supercharging operation by electric drive, engine rotation speed detection means, and an accelerator. In a control device for a turbocharger with a rotating electric machine, the control device includes a pedal depression amount detection means and a boost pressure detection means for the engine, and electrically drives the rotating electric machine according to the engine operating state based on signals from these detection means. Provided is a control device for a turbocharger with a rotating electrical machine, comprising: atmospheric pressure detection means for detecting ground atmospheric pressure; and control means for controlling supercharging assist operation by electric drive of the rotating electrical machine in response to a signal from the detection. be done.

[0008]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a control device for a turbocharger with rotating electric machine according to the present invention.

In the figure, reference numeral 1 denotes an engine that drives wheels 15 using the combustion energy of air taken in through an intake pipe 11 and fuel supplied from a fuel injection device 2 to run the vehicle. Gas is exhausted via exhaust pipe 12. Note that 13 is a clutch and 14 is a transmission, and engine torque is transmitted to wheels 15 via these power transmission mechanisms.

3 is a turbocharger, and an exhaust pipe 12
The engine is equipped with a turbine 31 that is rotated by exhaust energy discharged from the engine, and a compressor 32 that is driven by the turbine torque and compresses air. 1. Also, 16
17 is an engine rotation sensor that serves as a means for detecting the rotation speed of the engine 1; 22 is an accelerator sensor that serves as a means for detecting the boost pressure to the engine 1; 21 to serve as a depression amount detection means, and detection signals from these sensors are sent to controllers, which will be described later.

Reference numeral 4 denotes a rotating electric machine disposed on the rotating shaft of the turbocharger 3. For example, when the engine 1 is accelerating or under low rotation and high load, it operates as an electric motor using electric power from a battery 42 supplied via a power converter 41. The controller issues a conversion command to the power converter 41, which has the function of converting DC power from the battery 42 into predetermined AC power. It is configured to be issued from 5 onwards.

The controller 5 is composed of a microcomputer, and includes a central control unit that performs arithmetic processing, various memories that store arithmetic processing procedures, control procedures, target boost pressure value maps during acceleration, low rotation and high load, etc., and input/output. It is equipped with an output circuit, etc., and when detection signals from the various sensors mentioned above and the atmospheric pressure sensor 51 that detects the atmospheric pressure of the running area are input, predetermined arithmetic processing is performed, and based on the stored control procedure. A control command is issued to the power converter 41 and the like.

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 using this figure.

In step 1, the engine rotational speed NE from the engine rotation sensor 17, the accelerator opening RP from the accelerator pedal sensor 22, the boost pressure PB from the boost pressure sensor 16, and the atmospheric pressure Pa from the atmospheric pressure sensor 51.
Read each. In step 2, the operating state of the engine is detected based on the engine rotational speed NE and the accelerator opening RP, and during acceleration or low rotation and high load, the target boost pressure PB' is read from the stored target boost pressure value map.

Then, in step 3, the atmospheric pressure sensor 51
A correction value ΔΒ is calculated by comparing the atmospheric pressure Pa from the standard state with the atmospheric pressure value in the standard state, and in step 4, the target boost pressure PB' is corrected using this correction value ΔΒ to obtain the target boost pressure correction value PB. During subsequent driving, the determined value of PB is used as a target value, and control is performed to assist the supercharging operation by the rotating electric machine during acceleration, low rotation and high load, etc.

The processing in this processing flow chart is performed at predetermined time intervals, and control is performed by constantly updating the target boost pressure value to a new target boost pressure value using a correction value based on the atmospheric pressure at the high altitude where the vehicle is traveling.

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

[0019]

As described above, according to the present invention, when driving at high altitudes, the target boost pressure from the control map is corrected by correction based on atmospheric pressure, and the power to the rotating electric machine is adjusted to the target value based on the correction. Since the supercharging pressure is increased by controlling the
This has the advantage that the power supplied to the rotating electric machine becomes appropriate.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram of an embodiment of a control device for a turbocharger with rotating electric machine according to the present invention.

FIG. 2 is a processing flow diagram showing an example of the operation of this embodiment.

[Explanation of symbols]

1...Engine 3...Turbocharger 4...Rotating electric machine 5...Controller 16...Boost pressure sensor 17...Boost pressure sensor 22...Accelerator sensor

Claims (1)

[Claims] The turbocharger includes a rotating electric machine that is arranged in the turbocharger and assists the supercharging operation by electric drive, an engine rotation speed detection means, an accelerator pedal depression amount detection means, and a boost pressure detection means for the engine. A control device for a turbocharger with a rotating electrical machine that electrically drives a rotating electrical machine according to the engine operating state based on a signal from the rotating electrical machine includes: atmospheric pressure detection means for detecting the atmospheric pressure of a running area; 1. A control device for a turbocharger with a rotating electric machine, comprising: a control means for controlling a supercharging assist operation by an electric drive of the turbocharger.