Automatic ignition control system
First Claim
1. An engine ignition control system comprising an ignition circuit of capacitor charge-discharge type in which the ignition timing is determined by controlling the charge-discharge cycle of an ignition energy-securing capacitor by an engine speed detection circuit, said system further comprising:
- an overspeed control circuit including first comparator means for comparing a detection output signal level from the engine speed detection circuit with a first reference voltage level corresponding to a set engine speed and producing a difference output therebetween, and second comparator means for comparing said difference output from the first comparator means with a second reference voltage level corresponding to the set engine speed, the ignition being stopped in accordance with the output of the second comparator means when the difference output from the first comparator means exceeds the second reference voltage level; and
a slowing down control circuit actuated by engine slowing down operation start means in such a manner that the first reference voltage level of the first comparator means of the overspeed control circuit is gradually increased thereby to reduce a set engine speed, thereby stopping the ignition in a condition substantially equivalent to the one in which the engine speed detection circuit detects an engine speed higher than the actual engine speed.
1 Assignment
0 Petitions
Accused Products
Abstract
An engine ignition control system comprising an ignition circuit of capacitor charge-discharge type is disclosed in which the ignition timing is determined by controlling the charge-discharge cycle of a capacitor by an output signal from an engine speed detection circuit. An overspeed control circuit stops the ignition when a detection output signal of the engine speed detection circuit exceeds a reference voltage level corresponding to a set engine speed. A slowing down control circuit is actuated in response to an engine slowing down operation start switch for realizing a hypothetical condition substantially equivalent to the one in which the engine speed detection circuit detects an engine speed higher than the actual engine speed thereby to accomplish engine slowing down operation by (a) increasing the reference voltage level gradually, or (b) increasing the output signal level of the engine speed detection circuit stepwise.
12 Citations
8 Claims
-
1. An engine ignition control system comprising an ignition circuit of capacitor charge-discharge type in which the ignition timing is determined by controlling the charge-discharge cycle of an ignition energy-securing capacitor by an engine speed detection circuit, said system further comprising:
-
an overspeed control circuit including first comparator means for comparing a detection output signal level from the engine speed detection circuit with a first reference voltage level corresponding to a set engine speed and producing a difference output therebetween, and second comparator means for comparing said difference output from the first comparator means with a second reference voltage level corresponding to the set engine speed, the ignition being stopped in accordance with the output of the second comparator means when the difference output from the first comparator means exceeds the second reference voltage level; and a slowing down control circuit actuated by engine slowing down operation start means in such a manner that the first reference voltage level of the first comparator means of the overspeed control circuit is gradually increased thereby to reduce a set engine speed, thereby stopping the ignition in a condition substantially equivalent to the one in which the engine speed detection circuit detects an engine speed higher than the actual engine speed. - View Dependent Claims (2, 3, 4)
-
-
5. An engine ignition control system comprising an ignition circuit of capacitor charge-discharge type in which the charge-discharge cycle of an ignition energy-securing capacitor is controlled by an engine speed detection circuit thereby to determine an ignition timing, said system further comprising:
-
an overspeed control circuit including a capacitor and a charge-discharge circuit for the capacitor for stopping the ignition by the charge-discharge circuit when a detection output signal level from the engine speed detection circuit exceeds a first reference voltage level corresponding to a set engine speed; and a slowing down operation control circuit actuated by an engine slowing down operation start means for increasing the detection output signal level from the engine speed detection circuit stepwise thereby to realize a condition substantially equivalent to the one in which the engine speed detection circuit detects an engine speed higher than the actual engine speed, thereby performing the slowing down operation of the engine. - View Dependent Claims (6, 7, 8)
-
Specification