Device for controlling turbocharger with electric rotary machine

• US 4,882,905 A
• Filed: 07/28/1988
• Issued: 11/28/1989
• Est. Priority Date: 07/29/1987
• Status: Expired due to Term

• Current Assignee: Isuzu Motors Limited
• Original Assignee: Isuzu Motors Limited
• Inventors: Kawamura, Hideo
• Primary Examiner(s): KOCZO JR, MICHAEL
• Application Number:
  US07/225,255
• Time in Patent Office: 488 Days
• Field of Search: 60/607, 60/608, 290/52
• US Class Current: 60/608
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 37/10 at least one pump being alternatively or simultaneously driven by exhaust and other drive, e.g. by pressurised fluid from a reservoir or an engine-driven pump
• CPC Class Codes: F02B 37/14 Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: F02B 39/10 electric
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A device for controlling a turbocharger with an electric rotary machine detects, at all times, the rotational speed of the engine on a motor vehicle and the amount of depression of the accelerator pedal while the motor vehicle is running, to confirm present running conditions of the motor vehicle. A required boost pressure which is required under the confirmed running conditions is determined, and if the required boost pressure is higher than the boost pressure produced from the turbocharger by the energy of exhaust gases emitted from the engine and corresponding to the rotational speed of the engine, the controlling device drives the electric rotary machine coupled to the rotatable shaft of the turbocharger as a motor to increase the speed of rotation of the turbocharger for a quick buildup of the boost pressure.

Claims

1. A device for controlling a turbocharger with an electric rotary machine, comprising:

a turbine mounted on an engine on a motor vehicle and drivable by exhaust gases emitted from the engine;

a rotatable shaft coupled to said turbine;

a compressor coupled to said rotatable shaft for delivering air under pressure to said engine;

an electric rotary machine coupled to said rotatable shaft;

an engine speed sensor for detecting the rotational speed of the engine;

an accelerator pedal movement sensor for detecting the amount of depression of an accelerator pedal which controls operation of said engine;

a boost pressure sensor for detecting the pressure of air supplied to said engine;

a turbine speed sensor for detecting the rotational speed of said turbine;

a battery mounted on said motor vehicle;

means for calculating a required boost pressure based on signals from said engine speed sensor and said accelerator pedal movement sensor;

means for comparing said required boost pressure and a boost pressure generated from the turbocharger by the energy of exhaust gases emitted from the engine and corresponding to the rotational speed of the engine; and

means for driving said electric rotary machine as a motor and supplying said electric rotary machine with electric power from said battery which corresponds to the difference between said required boost pressure and said boost pressure generated by the turbocharger if said required boost pressure is higher than said boost pressure generated by said turbocharger,

wherein said means for driving and supplying said electric rotary machine includes means for adding electric power corresponding to the rotational speed signal from said turbine speed of the turbine based on a signal from said turbine speed sensor and electric power having a value produced by subtracting the boost pressure, to calculate electric power which is required to be supplied to said electric rotary machine.

2. A device according to claim 1, wherein said means for driving and supplying said electric rotary machine includes means for adding electric power corresponding to the rotational speed of the turbine based on a signal from said turbine speed sensor and electric power having a value produced by subtracting said boost pressure produced by said turbocharger from said required boost pressure, to calculate corrected electric power which is required to be supplied to said electric rotary machine, if the boost pressure detected by said boost pressure sensor after said electric rotary machine has been operated as a motor is higher than the boost pressure detected by said boost pressure sensor before said electric rotary machine is operated as a motor.

3. A device according to claim 2, wherein said means for driving and supplying said electric rotary machine includes power regulating means for reducing electric power to be supplied to said electric rotary machine by a prescribed amount if the boost pressure detected by said boost pressure sensor after said electric rotary machine has been operated as a motor is higher than said required boost pressure.

4. A device for controlling a turbocharger with an electric rotary machine, comprising:

a turbine mounted on an engine on a motor vehicle and drivable by exhaust gases emitted from the engine;

a rotatable shaft coupled to said turbine;

a compressor coupled to said rotatable shaft for delivering air under pressure to said engine;

an electric rotary machine coupled to said rotatable shaft;

an engine speed sensor for detecting the rotational speed of the engine;

an accelerator pedal movement sensor for detecting the amount of depression of an accelerator pedal which controls operation of said engine;

a boost pressure sensor for detecting the pressure of air supplied to said engine;

a battery mounted on said motor vehicle;

means for calculating a required boost pressure based on signals from said engine speed sensor and said accelerator pedal movement sensor;

means for comparing said required boost pressure and a boost pressure generated from the turbocharger by the energy of exhaust gases emitted from the engine and corresponding to the rotational speed of the engine;

means for driving said electric rotary machine as a motor and supplying said electric rotary machine with electric power from said battery which corresponds to the difference between said required boost pressure and said boost pressure generated by the turbocharger if said required boost pressure is higher than said boost pressure generated by said turbocharger; and

means for comparing the boost pressure after said electric rotary machine has been operated as a motor and the boost pressure before said electric rotary machine is operated as a motor, after the electric rotary machine has been operated as a motor and for generating a warning signal if the boost pressure after said electric rotary machine has been operated as a motor is lower than the boost pressure before said electric rotary machine is operated as a motor.

5. A device for controlling a turbocharger with an electric rotary machine, comprising:

a turbine mounted on an engine on a motor vehicle and drivable by exhaust gases emitted from the engine;

a rotatable shaft coupled to said turbine;

a compressor coupled to said rotatable shaft for delivering air under pressure to said engine;

an electric rotary machine coupled to said rotatable shaft;

an engine speed sensor for detecting the rotational speed of the engine;

an accelerator pedal movement sensor for detecting the amount of depression of an accelerator pedal which controls operation of said engine;

a boost pressure sensor for detecting the pressure of air supplied to said engine;

a battery mounted on said motor vehicle;

means for calculating a required boost pressure based on signals from said engine speed sensor and said accelerator pedal movement sensor;

means for comparing said required boost pressure and a boost pressure generated from the turbocharger by the energy of exhaust gases emitted from the engine and corresponding to the rotational speed of the engine;

means for driving said electric rotary machine as a motor and supplying said electric rotary machine with electric power from said battery which corresponds to the difference between said required boost pressure and said boost pressure generated by the turbocharger if said required boost pressure is higher than said boost pressure generated by said turbocharger; and

means for comparing the boost pressure after said electric rotary machine has been operated as a motor and the boost pressure before said electric rotary machine is operated as a motor, after the electric rotary machine has been operated as a motor, and for stopping the operation of said electric rotary machine as a motor if the boost pressure after said electric rotary machine has been operated as a motor is lower than the boost pressure before said electric rotary machine is operated as a motor.