Invention Grant
US09176179B2 Method and device for diagnosing a reservoir capacitor of a vehicle passenger protection system, and vehicle safety system incorporating such device
有权
用于诊断车辆乘客保护系统的储存电容器的方法和装置，以及包括这种装置的车辆安全系统
- Patent Title: Method and device for diagnosing a reservoir capacitor of a vehicle passenger protection system, and vehicle safety system incorporating such device
- Patent Title (中): 用于诊断车辆乘客保护系统的储存电容器的方法和装置，以及包括这种装置的车辆安全系统
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Application No.: US14112042Application Date: 2011-04-22
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Publication No.: US09176179B2Publication Date: 2015-11-03
- Inventor: Erwan Hemon , Hamada Ahmed , Pierre Turpin
- Applicant: Erwan Hemon , Hamada Ahmed , Pierre Turpin
- Applicant Address: US TX Austin
- Assignee: Freescale Semiconductor, Inc.
- Current Assignee: Freescale Semiconductor, Inc.
- Current Assignee Address: US TX Austin
- International Application: PCT/IB2011/001221 WO 20110422
- International Announcement: WO2012/143750 WO 20121026
- Main IPC: G01R31/12
- IPC: G01R31/12 ; G01R27/26 ; G01R31/02 ; B60R21/017 ; G01R31/01 ; G01R31/00
Abstract:
A method of measuring a capacitor value comprises the steps of loading the capacitor up to a given voltage value; obtaining a first measure of a time for discharging the capacitor by a fixed voltage drop, the discharge of the capacitor being caused by a first current; reloading the capacitor up to the given voltage value; obtaining a second measure of a time for discharging the capacitor by the fixed voltage drop, the discharge of the capacitor being caused by the first current and by a second current of known value added to said first current; and determining the capacitor value from the difference between the first measure and the second measure, based on the given voltage drop or the given time, respectively, and based further on the known value of the given second current.
Public/Granted literature
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