Device for testing ignition system of a combustion engine

US4277752A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Dinkelacker · Stuttgart, DE
• Juergen Knoedler · Winnenden, DE

Key dates

• Filing date: Mar 5, 1979
• Grant date: Jul 7, 1981
• Expiry date: Mar 5, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P17/00
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The device for testing an ignition system of a combustion engine comprises an adjustable load connected in the primary winding of the ignition coil by means of which the stored energy is so long reduced until due to the deficient energy the first ignition slip of the fuel-air-mixture occurs. This reduced energy is compared with the nominal or normal energy required for proper operation of the ignition system and the difference between the two values determines a measure for ignition energy reserve and consequently a measure for the condition of the whole ignition system. The energy reserve is measured selectively always for a part of the ignition system, that means for a cylinder of the engine. For this purpose a selective switch is employed using a scaler fed by pulses derived from the contact breaker and synchronized by a pulse from the part of the cylinder under test produce an output pulse which connects the loading member to the primary winding of the ignition coil.