JP2008175126A - Turbocharger with motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recover the exhaust gas energy of a turbocharger with a motor even when the turbocharger is driven by the motor while simplifying the structure and suppressing increase in the number of parts. <P>SOLUTION: This turbocharger with a motor comprises a turbocharger 1 assemblable with an engine 4, a motor 2 axially coupled to the turbocharger 1, and a motor driver 5 for driving and controlling the motor. The turbocharger 2 further comprises an energy recovery part 10 for recovering energy by introducing a part or all of the exhaust gas discharged from the turbine 1a of the turbocharger 1, a valve 7 capable of increasing or decreasing the ratio of the exhaust gas introduced into the energy recovery part 10, and a valve controller 8 for controllably opening and closing the valve 7 according to a predetermined control pattern. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a turbocharger with an electric motor having an energy recovery unit.

A turbo compound system is known that collects exhaust gas energy during normal operation and travels with a drive motor with an adiabatic engine idling when traveling in an urban area or the like to suppress noise and exhaust gas flow (Patent Literature). 1). That is, an auxiliary turbine generator is provided on a heat insulation engine having a turbocharger equipped with a generator / motor and an energy recovery device. During normal operation, the power generated by the turbocharger and energy recovery device is consumed to assist the driving force of the vehicle, and when driving in the city at night or when entering the garage, the power stored in the power storage device is consumed. To drive the vehicle. Exhaust gas from the heat insulation engine is supplied to the turbocharger and the energy recovery device or the auxiliary turbine generator by the switching valve.
JP-A-6-248964

  However, in the technique of Patent Document 1, since the energy efficiency of the double heat recovery system depends on the operating condition of the engine, it is necessary to control the opening and closing of the valve without waste based on an empirical rule. Conventionally, when the turbocharger with an electric motor is driven by a motor in an operating situation where the engine is suddenly accelerated, the energy contained in the exhaust gas is wasted because the exhaust gas flow rate is close to the peak. .

  That is, it is difficult to recover energy from the high energy exhaust gas when the turbocharger with an electric motor drives the motor and assists by electric power at the time of sudden acceleration or the like. In order to recover the energy during the electric assist, it is inevitable that the apparatus becomes complicated and expensive because precise control know-how is executed.

  The present invention has been made in view of the above-described circumstances. The entire apparatus is simple and suppresses an increase in the number of parts, and even when the motorized turbocharger is driven by a motor, the exhaust gas energy is recovered. Therefore, it is possible to obtain electric energy and to improve the engine efficiency considerably.

  In order to achieve the above object, a first invention includes a turbocharger that can be combined with an engine, an electric motor axially coupled to the turbocharger, and a motor driver that drives and controls the electric motor. In the turbocharger, an energy recovery unit that recovers energy by introducing a part or all of the exhaust gas exhausted from the turbine of the turbocharger, and a valve that can freely adjust the ratio of the exhaust gas introduced into the energy recovery unit; And a valve controller that controls opening and closing of the valve based on a predetermined control pattern.

  In a second aspect of the invention, as the energy recovery unit, a turbine that is rotated by the introduced exhaust gas, a generator that is shaft-coupled to the turbine, and a power generation voltage of the generator are adjusted to charge the battery. And a voltage regulator to be provided.

  According to the first aspect of the present invention, when the turbocharger with an electric motor is driven by a motor in an operating situation in which the engine is suddenly accelerated, the exhaust gas flow rate is close to the peak. Although it was thrown away, the valve controller that controls opening and closing based on the control pattern, the valve operates precisely to increase the ratio of exhaust gas introduced into the energy recovery unit, and the energy recovery unit recovers the exhaust gas energy .

  Since the energy efficiency of such a double heat recovery system depends on the operating conditions of the engine, precise and efficient control know-how is executed by controlling the valve opening and closing with a lean control pattern based on empirical rules. It is possible.

  In this way, it is possible to recover the exhaust gas energy and significantly improve the engine efficiency even when the turbocharger with electric motor is driven by the motor, which can be simplified by suppressing the increase in the number of parts. Become.

  According to the second aspect of the invention, the recovered energy can be converted into electric energy and supplied to charge the battery.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of an electric turbocharger 20 according to the present embodiment. As shown in FIG. 1, the turbocharger 20 with an electric motor is based on a single heat recovery type turbocharger 2 with an electric motor that recovers heat of the exhaust gas of the engine 4 only once, and is subordinately connected via a valve 7 to the subsequent stage. The energy recovery unit 10 for further heat recovery is combined.

  A turbocharger 2 with an electric motor as a base includes a turbocharger 1 that can be combined with an engine 4, an electric motor (hereinafter also referred to as “motor”) 3 that is axially coupled to the turbocharger 1, and a motor that drives and controls the electric motor 3. The driver 5 is configured. The turbocharger 1 is configured such that a turbine 1a, a compressor 1b, and a motor 3 are axially coupled, and the exhaust gas of the engine 4 is introduced into the turbine 1a to rotate, and the engine 4 is supercharged by a coaxially rotating compressor 1b. .

  The turbocharger 2 with an electric motor increases in rotational speed when the turbine 1a is driven by the exhaust gas of the engine 4, but also increases with the assistance of the motor 3 (electrical assist) driven by the electric power of the battery 6. The rotational speed of the turbocharger 2 with an electric motor rapidly increases, for example, from a low-speed rotation of several thousand to about 10,000 rotations per minute to a high-speed rotation exceeding about 100,000 rotations per minute.

  The engine 4 is controlled by a command from an ECU (Engine Control Unit) (not shown). The turbocharger with electric motor 2 is appropriately driven and controlled by a command of a microcomputer for turbocharger with electric motor control (hereinafter also referred to as “control microcomputer”) 9 connected to the ECU.

  The motor driver 5 is constituted by driving means such as a known inverter (not shown) using the power of the battery 6. Preferably, the motor 3 and the motor driver 5 capable of regenerative operation can regenerate power for charging the battery 6.

  The control microcomputer 9 stores a control table (not shown) in which the engine operation status is patterned, and appropriately issues a control signal according to each operation status such as startup, acceleration, cruise, deceleration, and stop. . In addition, the motor driver 5 interposed between the motor 3 and the battery 6 supplies the power of the battery 6 to the motor 3 when the electric assist is turned on while receiving the support of the control microcomputer 9. The generated regenerative power is returned to charge the battery 6.

  And the energy recovery part 10 introduce | transduces a part or all of the exhaust gas exhausted from the turbine 1a of the turbocharger 2 with an electric motor, and recovers energy. The ratio of the exhaust gas introduced into the energy recovery unit 10 is optimally controlled by a valve 7 that can be freely adjusted and a valve controller 8 that controls opening and closing of the valve 7 based on a predetermined control pattern.

  The control pattern for optimally controlling the valve controller 8 means that the exhaust gas energy is recovered and the engine efficiency is improved even when the turbocharger with motor 2 is driven by a motor by executing a program stored in the control microcomputer 9. It becomes possible to improve considerably.

  The energy recovery unit 10 is configured to charge the battery 6 by adjusting a turbine 11 that is rotated by exhaust gas discharged from the engine 4, a generator 12 that is axially coupled to the turbine 11, and a power generation voltage of the generator 12. A voltage regulator 13 is provided. In other words, the turbocharger with electric motor 2 performs a double heat recovery function of recovering the exhaust gas that has already been heat recovered once for the second time.

  However, since the energy efficiency of the double heat recovery system depends on the operating condition of the engine 4, the valve 7 is controlled to open and close with a lean control pattern based on empirical rules. As a result, even when the turbocharger 2 with an electric motor is driven by a motor during sudden acceleration, which has been difficult to recover in the past, the exhaust gas energy is recovered, and the recovered energy is converted into electric energy to It can be provided for charging. As a result, the engine efficiency can be significantly improved.

It is a block diagram of the turbocharger with an electric motor which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turbocharger 1a Turbine 2,20 Turbocharger with an electric motor 3 Electric motor (motor)
4 Engine 5 Motor Driver 7 Valve 8 Valve Controller 10 Energy Recovery Unit 11 Turbine 12 Generator 13 Voltage Regulator

Claims (2)

Turbocharger that can be combined with the engine,
An electric motor axially coupled to the turbocharger;
In a turbocharger with an electric motor comprising a motor driver for driving and controlling the electric motor,
An energy recovery unit that recovers energy by introducing part or all of exhaust gas exhausted from the turbine of the turbocharger;
A valve capable of adjusting the ratio of exhaust gas introduced into the energy recovery unit;
And a valve controller that controls opening and closing of the valve based on a predetermined control pattern. As the energy recovery unit,
A turbine rotated by the introduced exhaust gas;
A generator shaft coupled to the turbine;
The turbocharger with an electric motor according to claim 1, further comprising: a voltage regulator that regulates a generated voltage of the generator and supplies the voltage to charge the battery.

Images