Motor drive control system and method for controlling the same
First Claim
1. A motor drive control system comprising:
- a DC power supply;
a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line;
an electric motor;
a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command;
an electric generator configured such that the electric generator can be rotationally driven by an external force;
a second inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric generator such that said electric generator operates according to an operational command;
voltage setting means for setting said voltage command value for said converter according to respective operational states of said electric motor and said electric generator;
lock detecting means for detecting a locked state of said electric motor;
voltage limiting means for setting said voltage command value to lower one of said voltage command value set by said voltage setting means and a predetermined limit voltage when said lock detecting means detects said locked state; and
power generation ensuring means for supplying electric power from said electric generator to said DC power supply line when said lock detecting means detects the locked state of said electric motor.
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Accused Products
Abstract
In a motor drive control system configured to include a converter capable of stepping up the voltage, when the locked state of MG2 operating as an electric motor does not occur (NO in S130), a voltage command value VHref for the converter output voltage is set according to respective required voltages of MG1 operating as an electric generator and MG2 (S140). In contrast, when the locked state of MG2 occurs (YES in S130), the voltage command value VHref is set to a limit voltage Vlmt or less for limiting the voltage step-up by the converter (S150, S180). When the locked state occurs, the converter output voltage is decreased and accordingly the DC voltage switched by the inverter is lowered, so that a switching loss at the switching device forming a part of the inverter is reduced and the temperature increase due to the heat generation can be suppressed.
22 Citations
18 Claims
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1. A motor drive control system comprising:
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a DC power supply; a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line; an electric motor; a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command; an electric generator configured such that the electric generator can be rotationally driven by an external force; a second inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric generator such that said electric generator operates according to an operational command; voltage setting means for setting said voltage command value for said converter according to respective operational states of said electric motor and said electric generator; lock detecting means for detecting a locked state of said electric motor; voltage limiting means for setting said voltage command value to lower one of said voltage command value set by said voltage setting means and a predetermined limit voltage when said lock detecting means detects said locked state; and power generation ensuring means for supplying electric power from said electric generator to said DC power supply line when said lock detecting means detects the locked state of said electric motor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A motor drive control system mounted on a vehicle, comprising:
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a DC power supply; a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line; an electric motor configured to generate a driving force for said vehicle; a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command; and lock detecting means for detecting a locked state of said electric motor, wherein an engine operated by combustion of fuel and a starting electric motor supplied, from said DC power supply line, with a voltage higher than the output voltage of said DC power supply, for starting said engine are further mounted on said vehicle, and said motor drive control system further comprises start limiting means for limiting start of said engine when said lock detecting means detects the locked state of said electric motor. - View Dependent Claims (8)
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9. A motor drive control system mounted on a vehicle, comprising:
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a DC power supply; a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line; an electric motor configured to generate a driving force for said vehicle; a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command; and lock detecting means for detecting a locked state of said electric motor, wherein an engine operated by combustion of fuel and a starting electric motor supplied, from said DC power supply line, with a voltage higher than the output voltage of said DC power supply for starting said engine are further mounted on said vehicle, and said motor drive control system further comprises start ensuring means for temporarily increasing said voltage command value for said converter to a required voltage of said starting electric motor only within a predetermined period of time required for starting said engine, when said lock detecting means detects said locked state and said engine is instructed to start.
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10. A method for controlling a motor drive control system,
said motor drive control system including: -
a DC power supply; a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line; an electric motor; a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command; an electric generator configured such that the electric generator can be rotationally driven by an external force; and a second inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric generator such that said electric generator operates according to an operational command, and said method comprising the steps of; setting said voltage command value for said converter according to respective operational states of said electric motor and said electric generator; detecting a locked state of said electric motor; limiting said voltage command value to lower one of said voltage command value that is set according to the operational state of said electric motor and a predetermined limit voltage when said locked state is detected; and ensuring power generation by said electric generator such that electric power is supplied from said electric generator to said DC power supply line when the locked state of said electric motor is detected. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for controlling a motor drive control system mounted on a vehicle,
said motor drive control system including: -
a DC power supply; a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line; an electric motor configured to generate a driving force for said vehicle; and a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command, an engine operated by combustion of fuel and a starting electric motor supplied, from said DC power supply line, with a voltage higher than the output voltage of said DC power supply, for starting said engine being further mounted on said vehicle, and said method comprising the steps of; detecting a locked state of said electric motor; and limiting start of said engine when the locked state of said electric motor is detected. - View Dependent Claims (17)
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18. A method for controlling a motor drive control system mounted on a vehicle,
said motor drive control system including a DC power supply; -
a converter configured to be able to step up an output voltage of said DC power supply and configured to variably control the output voltage of said DC power supply according to a voltage command value to output the output voltage to a DC power supply line; an electric motor configured to generate a driving force for said vehicle; and a first inverter performing electric power conversion, by means of a plurality of switching devices, between a DC power on said DC power supply line and an AC power for driving said electric motor such that said electric motor operates according to an operational command, an engine operated by combustion of fuel and a starting electric motor supplied, from said DC power supply line, with a voltage higher than the output voltage of said DC power supply, for starting said engine being further mounted on said vehicle, and said method comprising the steps of; detecting a locked state of said electric motor; and temporarily increasing said voltage command value for said converter to a required voltage of said starting electric motor only within a predetermined period of time required for starting said engine, when the locked state of said electric motor is detected and said engine is instructed to start.
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Specification