Method of detecting normality of PWM signal of airbag controller
AssigneeHyundai Mobis Co., Ltd.
InventorChung Hoon Cho
Life of this patent
Estimating the term…
Abstract
A method of detecting normality of a PWM signal, wherein an error in a pulse-width modulation (PWM) signal is detected using four different self-test logics, and information obtained by categorizing results of detection into failure modes is transmitted to a vehicle component controller, so that the consistency of the PWM signal is determined, a signal safety means is secured, and further, safety standard requirements of the automobile field are satisfied.
Claims13
A method of detecting whether a pulse width modulated (PWM) signal transmitted from an airbag controller to a vehicle component controller is normal, the method comprising:
- counting high values and low values of the PWM signal by detecting a number of high values and a number of low values separately during a particular period of the PWM signal;
- integrating the high values and the low values of the PWM signal;
- comparing count results of the high values and the low values to first comparison values, and comparing integration results of the high values and the low values to second comparison values;
- and
- detecting whether the PWM signal is normal by separately deriving diagnosis results according to comparisons with the count results and diagnosis results according to comparisons with the integration results.
A method of detecting whether a pulse width modulated (PWM) signal transmitted from an airbag controller to a vehicle component controller is normal, the method comprising:
- counting high values and low values of the PWM signal;
- integrating the high values and the low values of the PWM signal by integrating a high value area and a low value area separately within a particular period of the PWM signal
- comparing count results of the high values and the low values to first comparison values, and comparing integration results of the high values and the low values to second comparison values;
- and
- detecting whether the PWM signal is normal by separately deriving diagnosis results according to comparisons with the count results and diagnosis results according to comparisons with the integration results.
A method of detecting whether a pulse width modulated (PWM) signal transmitted from an airbag controller to a vehicle component controller is normal, the method comprising:
- counting high values and low values of the PWM signal;
- integrating the high values and the low values of the PWM signal by integrating a high value area and a low value area separately within a total period of the PWM signal, and the total period of the PWM signal being predetermined and is as a sum of particular periods of the PWM signal
- comparing count results of the high values and the low values to first comparison values, and comparing integration results of the high values and the low values to second comparison values;
- and
- detecting whether the PWM signal is normal by separately deriving diagnosis results according to comparisons with the count results and diagnosis results according to comparisons with the integration results.
Dependencies are inferred from the claim text.