Wheel drive motors (8) constituted of electric motors for driving rear wheels (7) are provided on a vehicle body (2) of a dump truck (1). Each wheel drive motor (8) is connected to a main power generator (12) through a bidirectional converter (20) and the like and driven by power supplied from the m
Wheel drive motors (8) constituted of electric motors for driving rear wheels (7) are provided on a vehicle body (2) of a dump truck (1). Each wheel drive motor (8) is connected to a main power generator (12) through a bidirectional converter (20) and the like and driven by power supplied from the main power generator (12). A resistor (21) that consumes regenerative power from each wheel drive motor (8) is connected to the bidirectional converter (20). Cooling air is supplied to the resistor (21) from a blower (24). Operations of a switch (23) of the resistor (21) and the blower (24) are controlled by a controller (28). A mode selecting switch (29) for selecting a heating mode (A), a blowing mode (B), and a heating and blowing mode (C) is connected to the controller (28).
대표청구항▼
1. An electric working vehicle comprising: a traveling drive electric motor provided to a vehicle body;a bidirectional converter that is provided to said vehicle body converts direct current power from a direct current power supply into alternating current power having a variable frequency to drive
1. An electric working vehicle comprising: a traveling drive electric motor provided to a vehicle body;a bidirectional converter that is provided to said vehicle body converts direct current power from a direct current power supply into alternating current power having a variable frequency to drive said electric motor and converts an alternating current power output from said electric motor into direct current power;a resistor that is provided to said vehicle body and connected to said bidirectional converter so as to consume electro motive force regenerated by said electric motor;a blower that supplies cooling air to said resistor;a controller that is connected to operate said bidirectional converter, said resistor, and said blower; anda mode selecting switch connected to said controller and configured to select any one mode from a heating mode for performing heat generation in said resistor, a blowing mode for blowing air to said resistor by using said blower, and a heating and blowing mode for simultaneously performing heat generation using said resistor and blowing air to said resistor using said blower,wherein said controller is configured to control operations of said bidirectional converter, said resistor, and said blower in accordance with an acceleration and a deceleration of said vehicle body when said vehicle body is traveling, and control operations of said resistor and said blower in accordance with a mode selected by said mode selecting switch when said vehicle body is at a stop. 2. The electric working vehicle according to claim 1, further comprising: an acceleration sensor connected to said controller to determine said acceleration of said vehicle body; anda brake sensor connected to said controller to determine said deceleration of said vehicle body. 3. The electric working vehicle according to claim 1, wherein said controller is configured to: convert direct current power from said direct current power supply into alternating current power by said bidirectional converter to be supplied to said electric motor, stop the heat generation of said resistor, and stop the air blowing of said blower when said vehicle body is accelerating,convert electro motive force of an alternating current regenerated by said electric motor into direct current power by said bidirectional converter, enable the heat generation in said resistor so as to consume the direct current power, and supply cooling air to said resistor by said blower when said vehicle body is decelerating, and stop operations of said bidirectional converter and control operations of said resistor and said blower in accordance with a mode selected by said mode selecting switch when said vehicle body is at a stop. 4. The electric working vehicle according to claim 1, further comprising: a temperature sensor that detects a temperature of said resistor; anda mode change processing device which, in the state of said heating mode being selected by said mode selecting switch, maintains said heating mode when an increase in temperature of said resistor is detected by said temperature sensor and changes to said blowing mode when an increase in temperature of said resistor is not detected by said temperature sensor. 5. The electric working vehicle according to claim 1, wherein said resistor is accommodated in a grid box in which said blower is disposed, further comprising: a differential pressure sensor that is provided in said grid box to detect a pressure difference between the upstream side and the downstream side of said resistor with respect to a blowing direction from said blower; anda mode change processing device which, in the state of said blowing mode being selected by said mode selecting switch, maintains said blowing mode when the pressure difference detected by said differential pressure sensor is larger than a predetermined minimum pressure difference and changes to said heating mode when the pressure difference detected by said differential pressure sensor is less than said predetermined minimum pressure difference. 6. An electric vehicle transport system of a vehicle body, comprising: an electric motor;a bidirectional converter that converts direct current power from a direct current power supply into alternating current power having a variable frequency to drive said electric motor and converts an alternating current power output from said electric motor into direct current power;a resistor connected to said bidirectional converter to consume electro motive force regenerated by said electric motor;a blower that supplies air to said resistor;a controller that is connected to operate said bidirectional converter, said resistor, and said blower; anda mode selecting switch connected to said controller to changeably select any one of a heating mode for performing heat generation in said resistor, a blowing mode for blowing air to said resistor by using said blower, and a heating and blowing mode for simultaneously performing heat generation using said resistor and blowing air to said resistor using said blower,wherein said controller is configured to control operations of said bidirectional converter, said resistor, and said blower in accordance with an acceleration and a deceleration of said vehicle body when said vehicle body is traveling, and control operations of said resistor and said blower in accordance with a mode selected by said mode selecting switch when said vehicle body is at a stop. 7. The electric vehicle transport system according to claim 6, further comprising: an acceleration sensor connected to said controller to determine said acceleration of said vehicle body; anda brake sensor connected to said controller to determine said deceleration of said vehicle body. 8. The electric vehicle transport system according to claim 6, wherein said controller is configured to: convert direct current power from said direct current power supply into alternating current to be supplied to said electric motor power with said bidirectional converter, stop the heat generation of said resistor, and stop the air blowing of said blower when said vehicle body is accelerating,convert electro motive force of an alternating current regenerated by said electric motor into direct current power with said bidirectional converter, enable the heat generation in said resistor so as to consume the direct current power, and blow air to said resistor by said blower when said vehicle body is decelerating, andstop said bidirectional converter and control said resistor and said blower in accordance with a mode selected by said mode selecting switch when said vehicle body is at a stop. 9. The electric vehicle transport system according to claim 6, further comprising: a temperature sensor that detects a temperature of said resistor; anda mode change processing device which, in the state of said heating mode being selected by said mode selecting switch, maintains said heating mode when an increase in temperature of said resistor is detected by said temperature sensor and changes to said blowing mode when an increase in temperature of said resistor is not detected by said temperature sensor. 10. The electric vehicle transport system according to claim 6, wherein said resistor is accommodated in a grid box in which said blower is disposed, further comprising: a differential pressure sensor provided in said grid box to detect a pressure difference between an upstream side and a downstream side of said resistor with respect to a blowing direction from said blower; anda mode change processing device which, in the state of said blowing mode being selected by said mode selecting switch, maintains said blowing mode when the pressure difference detected by said differential pressure sensor is larger than a predetermined minimum pressure difference and changes to said heating mode when the pressure difference detected by said differential pressure sensor is less than said predetermined minimum pressure difference.
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