Electric motor driving system, electric four-wheel drive vehicle, and hybrid vehicle

A control system for an electric driving system, used in an electric driving system for a multi-wheel drive vehicle, wherein said electric driving system for a multi-wheel drive vehicle comprises:

• a generator for outputting DC electrical power by the driving force received from an internal combustion engine for driving at least one of a plurality of wheels;
• an inverter for converting said DC electrical power directly received from said generator, into AC electrical power;
• and
• an AC electric motor, which is driven by the AC electrical power output from said inverter, for driving at least one of said plurality of wheels other than said wheels driven by said internal combustion engine,
• wherein said control system for an electric driving system privides control means for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque received from a vehicle for said AC electric motor,
• and wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control means control the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor.

A control system for an electric driving system, used in an electric driving system for an electric vehicle, wherein said electric driving system for an electric vehicle comprises:

• a capacitor which enables charging/discharging using DC electrical power;
• an inverter for converting said DC electrical power received by discharging said capacitor, into AC electrical power;
• and
• an AC electric motor, which is driven by the AC electrical power output from said inverter, for generating electrical driving force for driving said vehicle,
• wherein said control system for an electric driving system provides control means for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque received from a vehicle for said AC electric motor,
• and wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control means control the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor.

An electric driving system for a vehicle, for generating electrical driving force for driving a component of the vehicle to be driven, comprising:

• an in-vehicle power supply for supplying DC electrical power;
• an inverter for converting said DC electrical power, output from said in-vehicle power supply, into AC electrical power;
• an AC electric motor, which is driven by the AC electrical power output from said inverter, for generating electrical driving force;
• and
• a control unit for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque for said AC electric motor,
• wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control unit controls the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor,
• and wherein the excess electrical power is supplied to said inverter from said in-vehicle power supply in the form of loss in said AC electric motor.

An electric driving system for a multi-wheel drive vehicle having a function of driving at least one of a plurality of wheels by an internal combustion engine, and a function of driving at least one of said plurality of wheels other than said wheels driven by said internal combustion engine, by electrical driving force, said electric driving system comprising:

• a generator for outputting DC electrical power by the driving force received from said internal combustion engine;
• an inverter for converting said DC electrical power directly received from said generator, into AC electrical power;
• an AC electric motor, which is driven by the AC electrical power output from said inverter, for driving at least one of said plurality of wheels other than said wheels driven by said internal combustion engine;
• and
• a control device including control means for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque received from a vehicle for said AC electric motor,
• wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control means control the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor,
• and wherein the excess electrical power is supplied to said inverter from said generator in the form of loss in said AC electric motor.

An electric driving system for driving a vehicle by electrical driving force comprising:

• a capacitor which enables charging/discharging using DC electrical power;
• an inverter for converting said DC electrical power received by discharging said capacitor, into AC electrical power;
• an AC electric motor, which is driven by the AC electrical power output from said inverter, for generating said electrical driving force;
• and
• a control device including control means for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque received from a vehicle for said AC electric motor,
• wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control means control the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor,
• and wherein the excess electrical power is supplied to said inverter from said capacitor in the form of loss in said AC electric motor.

A multi-wheel drive vehicle comprising:

• an internal combustion engine for driving at least one of a plurality of wheels;
• a generator, which is driven by said internal combustion engine, for outputting DC electrical power;
• an inverter for converting said DC electrical power, directly received from said generator, into AC electrical power;
• an AC electric motor, which is driven by the AC electrical power output from said inverter, for driving at least one of said plurality of wheels other than said wheels driven by said internal combustion engine;
• and
• a control device including control means for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque received from a vehicle for said AC electric motor,
• wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control means control the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor,
• and wherein the excess electrical power is supplied to said inverter from said generator in the form of loss in said AC electric motor.

A hybrid vehicle comprising:

• an internal combustion engine for generating driving force for a vehicle;
• an AC electric motor for generating driving force for said vehicle;
• a capacitor forming a power supply for said AC electric motor;
• an inverter for converting DC electrical power received from said capacitor, into AC electrical power, which is supplied to said AC electric motor for driving said AC electric motor;
• and
• a control device including control means for controlling driving of said AC electric motor by controlling said inverter according to an instructed torque received from a vehicle for said AC electric motor,
• wherein, in a case that the output of said AC electric motor becomes negative, and excess electrical energy is generated, said control means control the current applied to said AC electric motor such that the loss in said AC electric motor exceeds the negative output of said AC electric motor,
• and wherein the excess electrical power is supplied to said inverter from said capacitor in the form of loss in said AC electric motor.