Test Spark timing control system

Test Spark timing control system

In a gasoline engine, the air fuel mixture is ignited to cause combustion, and the force that is generated by the expansion causes the position of piston to push downwards.Therefore, Ignition takes place in advance so that enable the engine to generate the maximum combustion every moment depending on the operating conditions of the engine. SO, The timing that enables engine to generate an explosive force in the force in the most efficient manner in accordance with the operating condition.

Ignition Timing Control: -

The ignition system controls the ignition timing in accordance with the engine speed and load so that maximum combustion force occurs at 10 ATDC.In the past, Ignition system used a governor to advance and vacuum advancer to control timing advancing and retarding.

Engine Speed Control: -

It is considered on the engine to output power most efficient when the maximum combustion force occurs at 10 ATDC on which the optimal ignition system is set to 10 BTDC at a speed of 1000 rpm.It is supposed that the engine speed is increased to 2000 rpm. The duration for the ignition delay is practically constant regardless to engine speed. If same ignition described in (1) used at 2000 rpm, the timing at which the engine produce the maximum combustion force will be retarded at more than 10 ATDC. Therefore, To produce the maximum combustion force at 10 ATDC while the engine is runnin g at 2000 rpm, the ignition timing must be advanced in order to compensate for the crankshaft rotational angles that were retarded in (2) This process for advancing the ignition timing and for retarding the ignition timing is called timing retard.

Engine load Control: -

It is considered when the maximum combustion force occurs at 10 ATDC on which the optional ignition timing is set to 20 BTDC when the engine load is low.As the engine load increases the air density increases and the flame propagation perio d decreases. Therefore if the same ignition timing describe in (1) is used when the engine load is high the timing at the maximum combustion force will be more advance than 10 ATDC.

Engine Knock Control: -

Knocking in the engine is caused by spontaneous combustion that occurs when the air-fuel mixture self-ignition in the combustion chamber. An engine becomes more susceptible to knocking as its ignition timing is advanced. Excessive knocking negatively affect the performance of the engine, such as by causing poor fuel economy and poor power output.

Adjustable timing control: -

Increases fuel from mileage and performance are the ignition timing can be advanced or retarded to prevent engine detonation. The control knob mounts to the dash boards for easy and accurate timing adjustments up to 15.

Digital Multi-retard: -

The digital retard provides different stages of retard along with an adjustable start retard feature all of this with no modules.The MSD multi retard uses a high-speed micrometer to direct the multi retard can be used on 4,6 or 8 cylinder engines and must be uses with on MSD ignition control.

Differential Methods of controlling the spark ignition: -

Method of controlling or ignition timing retard limit in an internal combustion engine ignition control apparatus of the type.Where in means are provided for sensing the degree of opening of the engine throttle valve is and where in the step of detecting wall is engaged over a predetermined valve within a present period of time.

Method of controlling an ignition timing retard limit in an internal combustion engine as set final in claim 1, where in the retard limit is moved in the engine speed is less than a predetermined valve during a detonation of rapid acceleration.

Method of controlled an ignition timing retard limit in an I. C. engines as set forth in claim, where in the ignition control apparatus includes a preselected advance timing setting for load operation and where in during the detection of said rapid acceleration said retard limit is removed in the advanced direction to a position slightly to the retard side of said advance timing setting at low loads.