发明授权
- 专利标题: System for controlling electronic expansion valve provided in refrigerating machine
- 专利标题(中): 用于控制冷冻机中提供的电子膨胀阀的系统
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申请号: US997784申请日: 1992-12-29
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公开(公告)号: US5316263A公开(公告)日: 1994-05-31
- 发明人: Yoshihito Mino
- 申请人: Yoshihito Mino
- 申请人地址: JPX Kawasaki
- 专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人地址: JPX Kawasaki
- 优先权: JPX4-053843 19920312
- 主分类号: F24F11/02
- IPC分类号: F24F11/02 ; F16K37/00 ; F25B41/06 ; F25B49/02 ; G05B23/02 ; F16K31/02 ; G05B11/00
摘要:
It is possible to accurately and easily detect an abnormality in an electronic expansion valve without cutting or separating an electronic expansion valve from a cooling medium circuit. When an excitation pulse current from a drive circuit is output, a magnet rotor of an electronic expansion valve rotates. A hall element detects the position change of the magnet rotor at this time as detection pulses. The number of the detection pulses at this time is sent to a first up-down counter via an amplifier and a rectifier and is counted. The number of excitation pulses is also counted by a second up-down counter. The abnormality detection element judges that there is normal operation when the two count numbers of the first and second counters are in agreement, and that there is an abnormality when the two are not in agreement.
公开/授权文献
- US5867778A Switched gain element 公开/授权日:1999-02-02
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