Title:
SOLENOID VALVE DRIVE CONTROL CIRCUIT, SOLENOID VALVE DRIVE DEVICE, AND FUEL INJECTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2019/003757
Kind Code:
A1
Abstract:
A solenoid valve drive control circuit (30) is provided with: a timing generation circuit (31) that outputs a timing signal for controlling a drive circuit (20) in accordance with a solenoid valve opening/closing instruction signal (S1); and a valve closure detection circuit (36) that detects a valve closure timing by monitoring, as a signal voltage, a solenoid valve outflow terminal voltage (S6) in a solenoid valve (5) after the timing generation circuit (31) has outputted a timing signal that provides an instruction for closing a valve. The valve closure detection circuit (36) has a measurement circuit (37) that detects each timing of when the signal voltage reaches threshold value voltages sequentially outputted from a threshold value voltage selection circuit (39), and that outputs a signal indicating the timing of a valve closure in a case where a change of a measurement value obtained by measuring a time interval for each timing satisfies a predetermined condition.
Inventors:
KURODA KEISUKE
KAWAJIRI MAKOTO
MARUYAMA KEN
RYU TAKASHI
KAWAJIRI MAKOTO
MARUYAMA KEN
RYU TAKASHI
Application Number:
PCT/JP2018/020432
Publication Date:
January 03, 2019
Filing Date:
May 29, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
F02D41/20; F02M51/06; F16K31/06; F16K37/00; H01F7/18
Foreign References:
| JP2014031731A | 2014-02-20 | |||
| JP2014047655A | 2014-03-17 | |||
| JP2010109937A | 2010-05-13 | |||
| JPH05175846A | 1993-07-13 |
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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