US 5,703,410 AGranted

Control system for engine generator

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorHirotoshi Maekawa

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Abstract

A control system for an internal combustion engine equipped with an engine generator suppresses fluctuation and pulsation of rotation number of a crank shaft to realize optimal engine operation, enhanced fuel-cost performance and improved exhaust gas purification. An electronic controller for controlling an exciting current of the engine generator and an actuator for a throttle valve includes a unit for determining and storing a desired output power of the engine generator for a load voltage, a unit for determining and storing a desired torque of the engine generator as demanded for generating the desired output power on the basis of the load voltage and a rotation number of the crank shaft, a unit for arithmetically determining an exciting current required for making the demanded torque of the generator coincide with the desired torque, and a unit for driving an excitation coil assembly with the exciting current as determined. By controlling the demanded torque of the engine generator to be constant, the output power thereof is controlled to be constant while allowing the engine to operate at the rotation number which ensures a maximum output efficiency for the engine.

Claims10

Dependent claims

A control system for an engine generator, comprising:

a throttle valve for regulating a quantity of intake air supplied to an internal combustion engine;
engine control means for controlling a quantity of fuel to be injected to said engine and an ignition timing therefor;
an actuator for adjusting an opening degree of said throttle valve;
a rectifier circuit for rectifying an output voltage of said engine generator to thereby produce a DC load voltage;
a load supplied with an output power of said engine generator under application of said load voltage;
and
an electronic controller for controlling an exciting current of said engine generator, said engine control means and said actuator on the basis of various information indicative of operation states of said engine;
said various information containing at least information concerning a load voltage which depends on resistance of said load and information concerning a rotation number of said engine;
said electronic controller including:
desired output power setting means for determining a desired output power of said engine generator for a given load voltage and storing said desired output power;
desired torque setting means for determining a desired torque demanded by said engine generator required for generating said desired output power on the basis of said load voltage and said crank shaft rotation number and storing said desired torque;
exciting current arithmetic means for arithmetically determining an exciting current of said engine generator so that a demanded torque of said generator coincides with said desired torque;
and
exciting current control means for driving an excitation coil assembly of said engine generator with said excitation current;
wherein said demanded torque of said engine generator is controlled to be constant at said desired torque to thereby control said output power of said generator to be constant at said desired output power while allowing said engine to operate at a rotation number of the crank shaft at which a maximum output efficiency of said engine can be ensured.

12 more elements

A control system for an engine generator, comprising:

a throttle valve for regulating a quantity of intake air supplied to an internal combustion engine;
an actuator for adjusting an opening degree of said throttle valve;
an electronic controller for controlling an exciting current of said engine generator and said actuator on the basis of various information indicative of operation states of said engine, said various information including information concerning a load voltage of an electrical load of said generator and information concerning a rotation speed of said engine;
said electronic controller comprising:
desired output power setting means for determining a value of desired output power of said engine generator for a given load voltage and storing said value of desired output power;
desired torque setting means for determining a desired torque demanded by said engine generator required for generating said desired output power on the basis of said load voltage and said rotation speed of said engine and storing said desired torque;
exciting current arithmetic means for arithmetically determining an exciting current of said engine generator so that a demanded torque of said generator coincides with said desired torque;
and
exciting current control means for driving an excitation coil assembly of said engine generator with said excitation current;
wherein said demanded torque of said engine generator is controlled to be constant at said desired torque to thereby control said output power of said generator to be constant at said desired output power while allowing said engine to operate at a rotation speed at which a maximum output efficiency of said engine can be ensured.

7 more elements

Dependencies are inferred from the claim text.