Title:
時間計測機能付制御装置
Document Type and Number:
Japanese Patent JP4472963
Kind Code:
B2
Abstract:
The invention relates to a control device (2) with a time measuring function which measures a turned-off time of an ignition switch (3) with a low consumption current and high accuracy at a level adapted for a demand from the controlling side, as well as a turned-on time of the ignition switch (3). The control device (2) also measures an accumulative turned-on time of the ignition switch (3). The control device (2) comprises a battery (1), a microcomputer (7) for computing a control variable to control a control target, a time measuring unit (10), a clock source (12) for the microcomputer (7), a clock source (5) for the time measuring unit (10), and a unit for changing over operation of the time measuring unit (10) depending on an intended use. The time measuring unit (10) operates regardless of run/stop of the microcomputer (7).
Inventors:
Katsuya Koyama
Shoji Sasaki
Mitsuhiko Watanabe
Shoji Sasaki
Mitsuhiko Watanabe
Application Number:
JP2003349188A
Publication Date:
June 02, 2010
Filing Date:
October 08, 2003
Export Citation:
Assignee:
Hitachi Automotive Systems, Ltd.
International Classes:
G04F10/00; G04F10/04; G06F1/14; G06F19/00; G07C1/00
Domestic Patent References:
| JP2000329874A | ||||
| JP2003205798A | ||||
| JP4362398A | ||||
| JP2003193519A | ||||
| JP7052732A | ||||
| JP2036003B2 |
Attorney, Agent or Firm:
Polaire Patent Business Corporation