| Title of Invention | HYDRAULIC CONSTRUCTION MACHINE |
|---|---|
| Abstract | A reference pump-delivery-rate calculating portion (70a) calculates a reference delivery rate (QR10) of a hydraulic pump (1) by referring to a table stored in a memory based on a control pilot pressure (PL1) for the hydraulic pump. A target pump-delivery-rate calculating portion (70c) divides the reference delivery rate (QR10) by a ratio (NRC/NR1) of a maximum revolution speed NRC to a target engine revolution speed (NR1), thereby calculating a target delivery rate (QR11). A target pump tilting calculating portions (70e) divides the target delivery rate (QR11) by an actual engine revolution speed (NE1) and a constant (K1), thereby calculating a target tilting ([theta]R1). A solenoid output current calculating portion (70g) calculates a drive current (S11) to provide the target tilting ([theta]R1) and outputs the drive current (S11) to a solenoid control valve (30). The pump delivery rate is thereby controlled with good response following input change of operation instructing means. |
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1770-cal-1998-granted-abstract.pdf
1770-cal-1998-granted-claims.pdf
1770-cal-1998-granted-correspondence.pdf
1770-cal-1998-granted-description (complete).pdf
1770-cal-1998-granted-drawings.pdf
1770-cal-1998-granted-examination report.pdf
1770-cal-1998-granted-form 1.pdf
1770-cal-1998-granted-form 18.pdf
1770-cal-1998-granted-form 2.pdf
1770-cal-1998-granted-form 3.pdf
1770-cal-1998-granted-form 5.pdf
1770-cal-1998-granted-letter patent.pdf
1770-cal-1998-granted-priority document.pdf
1770-cal-1998-granted-reply to examination report.pdf
1770-cal-1998-granted-specification.pdf
1770-cal-1998-granted-translated copy of priority document.pdf
| Patent Number | 221560 | ||||||||||||||||||||||||||||||
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| Indian Patent Application Number | 1770/CAL/1998 | ||||||||||||||||||||||||||||||
| PG Journal Number | 26/2008 | ||||||||||||||||||||||||||||||
| Publication Date | 27-Jun-2008 | ||||||||||||||||||||||||||||||
| Grant Date | 25-Jun-2008 | ||||||||||||||||||||||||||||||
| Date of Filing | 06-Oct-1998 | ||||||||||||||||||||||||||||||
| Name of Patentee | HITACHI CONSTRUCTION MACHINERY CO., LTD. | ||||||||||||||||||||||||||||||
| Applicant Address | 6-2, OHTEMACHI 2-CHOME, CHIYODA-KU, TOKYO | ||||||||||||||||||||||||||||||
Inventors:
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| PCT International Classification Number | E02F 9/20 | ||||||||||||||||||||||||||||||
| PCT International Application Number | N/A | ||||||||||||||||||||||||||||||
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