Title:
SOLENOID VALVE CONTROL DEVICE
Document Type and Number:
Japanese Patent JP3440668
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce dispersion of flow due to environmental change at duty- controlling a solenoid valve.
SOLUTION: Pull-down resistance 15 is provided in parallel with a transistor 13 for driving the current carrying circuit of a solenoid valve 10, and small current is let flow during OFF of the driving transistor 13. From the potential difference of both ends of the coil of the solenoid valve 10 by the small current, a resistance equivalent value is detected (102), and averaged (103). A correcting value B is computed (104) based on the average value of the resistance equivalent value. The correcting value B is added to target duty A (101) so as to determine output duty, DUTY=A+B (105), and the transistor 13 is driven by a corresponding duty signal (106). However, when the output duty (DUTY) is over a fixed value, detection of the resistance equivalent value is prohibited (107).
Inventors:
Takehiko Itami
Hatsuo Nagaishi
Hideharu Kadooka
Hatsuo Nagaishi
Hideharu Kadooka
Application Number:
JP34190795A
Publication Date:
August 25, 2003
Filing Date:
December 27, 1995
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F02M25/08; F16K31/06; G05B11/28; H01F7/18; (IPC1-7): F16K31/06; F02M25/08; G05B11/28; H01F7/18
Domestic Patent References:
| JP5118463A | ||||
| JP60132182A | ||||
| JP777271A | ||||
| JP414757U |
Attorney, Agent or Firm:
Fujio Sasashima