{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "A system and method for controlling engine revolutions for a hybrid construction machine is provided. The system for controlling engine revolutions for a hybrid construction machine, including an engine (10), a hydraulic pump (13) which is driven by the engine (10) to drive a hydraulic actuator…",
  "path": "/patents/1015696",
  "publishedAt": "2011-02-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60K6/48",
    "VOLVO CONSTR EQUIP HOLDING SE [SE]"
  ],
  "textContent": "A system and method for controlling engine revolutions for a hybrid construction machine is provided. The system for controlling engine revolutions for a hybrid construction machine, including an engine (10), a hydraulic pump (13) which is driven by the engine (10) to drive a hydraulic actuator (15) with discharged hydraulic fluid, a motor-generator (17) which is driven by the engine (10) to generate electricity and to drive the hydraulic pump (13) as a motor supplementing the engine (10), an energy storage device (19) which is charged with electric energy generated by the motor-generator (17) and which supplies the electric energy for motor operation of the motor-generator (17), a torque detection means (40) for detecting an output torque of the hydraulic pump (13) that is required to drive the hydraulic actuator (15), and a hybrid control means (50) for controlling the motor operation of the motor-generator (17) so as to supplement the engine output if the change of the output torque of the hydraulic pump (13) detected by the torque detection means (40) exceeds a predetermined level and it is determined that an engine revolution drop will occur.",
  "title": "System and method for controlling engine revolutions for hybrid construction machine"
}