发明授权
US06672844B2 Apparatus and method for controlling variable displacement compressor
失效
用于控制可变排量压缩机的装置和方法
- 专利标题: Apparatus and method for controlling variable displacement compressor
- 专利标题(中): 用于控制可变排量压缩机的装置和方法
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申请号: US10040860申请日: 2001-11-09
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公开(公告)号: US06672844B2公开(公告)日: 2004-01-06
- 发明人: Tetsuhiko Fukanuma , Atsuyuki Morishita , Tomohiko Yokono
- 申请人: Tetsuhiko Fukanuma , Atsuyuki Morishita , Tomohiko Yokono
- 优先权: JP2000-343698 20001110
- 主分类号: F04B126
- IPC分类号: F04B126
摘要:
A variable displacement compressor has a control valve for controlling the displacement of the compressor. When the pressure in a discharge chamber of the compressor (discharge pressure) is equal to or higher than a first threshold value, a controller executes a limiting control for limiting the discharge pressure. During the limiting control, the controller gradually decreases a duty ratio, which is sent to the control valve, such that the displacement of the compressor is gradually decreased. When the duty ratio is decreased to a reference duty ratio, the controller sets the duty ratio to zero %. As a result, the compressor displacement is minimized and the discharge pressure is lowered. Therefore, the pipes of an external refrigerant circuit does not receive excessive load based on high discharge pressure.