Hybrid operating machine

• US 8,286,741 B2
• Filed: 06/29/2010
• Issued: 10/16/2012
• Est. Priority Date: 07/01/2009
• Status: Expired due to Fees

• Current Assignee: Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited
• Inventors: Kawashima, Koji
• Primary Examiner(s): Walters, John
• Assistant Examiner(s): Triggs, James
• Application Number:
  US12/825,915
• Publication Number:
  US 20110000722A1
• Time in Patent Office: 840 Days
• Field of Search: 180/69.5, 180/69.3, 180/65.265, 180/65.275, 180/65.285, 180/54.1, 701/36, 701/54, 701/55
• US Class Current: 180/65.285
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2050/146 Display means
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: E02F 9/123 Drives or control devices specially adapted therefor E02F9/125 and E02F9/128 take precedence
• CPC Class Codes: E02F 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2246 Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A motor generator selectively performs a power generation operation and an assisting operation. A torque transmission machine performs mutual transfer among a torque of an engine, a torque of the motor generator, and a torque to be applied to an external load of the engine. A speed sensor measures the rotating speed of the engine. A control device controls the engine and the motor generator. The control device stores a speed command value for the engine, calculates the torque generated by the motor generator based on the power required for the external load, to perform the torque control of the motor generator, and performs the speed control of the motor generator based on the difference between the rotating speed measured by the speed sensor and the speed command value. The torque control and the speed control of the motor generator can be switched.

Claims

1. A hybrid operating machine comprising:

an engine which generates torque by combustion of a fuel,

a motor generator capable of selectively performing a power generation operation and an assisting operation,

an external load serving as an engine load,

a torque transmission machine which performs mutual transfer among the torque of the engine, a torque of the motor generator, and a torque to be applied to the external load,

a speed sensor which measures the rotating speed of the engine, and

a control device which controls the engine and the motor generator,

wherein the control device is capable of

storing a speed command value which indicates a target value of the speed control of the engine,

calculating a torque generated by the motor generator on the basis of a motive power required for the external load to perform a torque control of the motor generator,

performing a speed control of the motor generator on the basis of a difference between a rotating speed measured by the speed sensor, and the speed command value, and

switching a control mode where the torque control of the motor generator is performed, and a control mode where the speed control of the motor generator is performed.

2. The hybrid operating machine according to claim 1,

wherein the control device switches the control mode of the motor generator on the basis of the rotating speed of the motor generator.

3. The hybrid operating machine according to claim 1,

wherein a torque limit control of the engine is performed when the torque to be generated exceeds an allowable limiting value, and

the control device switches the control mode of the motor generator to the speed control from the torque control, with a start of the torque limit control of the engine as a trigger.

4. The hybrid operating machine according to claim 3,

wherein the control device switches the control mode of the motor generator to the torque control from the speed control, with a release of the torque limit control of the engine as a trigger.