MOTOR GENERATOR UNIT WITH MULTIPLEXED OUTPUT

摘要

A vehicle includes an engine, transmission, auxiliary and high-voltage electrical loads, a drivetrain, and an electrical system. The electrical system, characterized by an absence of a DC-DC converter, includes a full-bridge active rectifier/inverter, a semi-active auxiliary rectifier, an MGU connected to the engine via the drivetrain, and a controller. The controller executes a first operating mode in which the bridge rectifier is disabled and the MGU operates as a motor to restart or assist the engine, and a second operating mode in which the MGU is a generator, with the rectifier/inverter powering the HV-ESS and HV electrical load. The auxiliary rectifier provides an auxiliary DC output voltage to the LV-ESS and auxiliary electrical load. Switches may be positioned between a DC bus connection point and the HV-ESS and LV-ESS, with a switch closed and another opened in the first operating mode, and vice versa in the second operating mode.

主权项

1. A vehicle comprising:
an internal combustion engine having a crankshaft; a transmission having an input shaft that is connected to the crankshaft; an auxiliary electrical load; a high-voltage (HV) electrical load; a drivetrain; and an electrical system that is characterized by an absence of a direct current (DC)-DC converter, and that includes:
a high-voltage energy storage system (HV-ESS) that is electrically connected to the HV electrical load;a low-voltage energy storage system (LV-ESS) that is electrically connected to the auxiliary electrical load;a polyphase full-bridge active rectifier/inverter having a plurality of semiconductor switches;a polyphase semi-active auxiliary rectifier;a polyphase motor generator unit (MGU) having phase windings that are electrically connected to the HV-ESS via the active rectifier/inverter and to the LV-ESS via the semi-active auxiliary rectifier, wherein the MGU is operatively connected to the crankshaft via the drivetrain; anda controller configured to selectively execute a first operating mode in which the semi-active bridge rectifier is temporarily disabled and the MGU is operated as a motor to restart or assist the engine, wherein the first operating mode includes supplying alternating current (AC) power to the phase windings of the MGU using an output of the full-bridge active rectifier/inverter, and a second operating mode in which the MGU is operated as a generator such that the full-bridge active rectifier/inverter supplies DC power to the HV-ESS and to the HV electrical load, and in which the semi-active auxiliary rectifier provides an auxiliary direct current (DC) output voltage to the LV-ESS and to the auxiliary electrical load.