Diagnostic apparatus for internal combustion engine ignition system
First Claim
Patent Images
1. A diagnostic apparatus for an internal combustion engine ignition system comprising:
- a secondary voltage rising gradient measuring circuit for measuring the gradient of rise of a secondary voltage generated by the secondary of an ignition coil;
a primary breaking current measuring circuit for measuring a primary current when the conduction of current through the primary of said ignition coil is interrupted; and
an arithmetic circuit for computing the value of stray capacitance existing in the ignition system and the value of secondary generation voltage, from information representative of the gradient measured by said secondary voltage rising gradient measuring circuit and from the value of the primary breaking current measured by said primary breaking current measuring circuit, said arithmetic circuit delivering out the stray capacitance and secondary generation voltage values.
1 Assignment
0 Petitions
Accused Products
Abstract
A diagnostic apparatus for an internal combustion engine ignition system measures the rise of the secondary voltage at the ignition coil represented by time lapse between initiation of the secondary voltage rising and occurrence of break and the ignition coil primary breaking current value. Results of the measurement are computed to determine stray capacitance existing in the internal combustion engine ignition system and secondary voltage.
-
Citations
5 Claims
-
1. A diagnostic apparatus for an internal combustion engine ignition system comprising:
-
a secondary voltage rising gradient measuring circuit for measuring the gradient of rise of a secondary voltage generated by the secondary of an ignition coil; a primary breaking current measuring circuit for measuring a primary current when the conduction of current through the primary of said ignition coil is interrupted; and an arithmetic circuit for computing the value of stray capacitance existing in the ignition system and the value of secondary generation voltage, from information representative of the gradient measured by said secondary voltage rising gradient measuring circuit and from the value of the primary breaking current measured by said primary breaking current measuring circuit, said arithmetic circuit delivering out the stray capacitance and secondary generation voltage values. - View Dependent Claims (2, 3, 4, 5)
-
Specification