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Vehicular Engines
Published in G. K. Awari, V. S. Kumbhar, R. B. Tirpude, Automotive Systems, 2021
G. K. Awari, V. S. Kumbhar, R. B. Tirpude
Ignition system: The ignition system generates the sparks necessary for the ignition of the air–fuel mixture. The optimal ignition timing is calculated by the ECU engine according to each driving condition. The ignition signal is then sent to the ignition coil (stick coil). The ignition coil generates a high voltage based on the ignition signal. This high voltage is then applied to the ignition plug electrodes, which generate ignition and cause the air–fuel mixture to burn within the cylinders.
Ignition and fuel
Published in Andrew Livesey, Motorcycle Engineering, 2021
The purpose of the ignition system is to provide a spark in the combustion chamber of the petrol engine, which will ignite the mixture of petrol and air while it is under pressure. As the piston compresses the petrol–air mixture on the compression stroke, the pressure may be increased to over 2000 kPa (300 psi). The voltage needed for the spark to jump across the spark plug gap at this high pressure is about 40 kV (40,000 volts).
Numerical simulation of the resistance braze welded assembly of a copper Inconel 601 ground electrode and a steel shell
Published in Numerical Heat Transfer, Part A: Applications, 2020
Chawki Tahri, Christophe Bertoni, Eric Feulvarch, Helmut Klocker, Jean-Michel Bergheau
Lower emissions, lower fuel consumption, and higher ignition voltage, with respect to the thermal loads: requirements continue to grow for automotive industries. The main function of an ignition system inside an engine remains the same: ignite the air/fuel mixture at the right time with the appropriate ignition energy. In gas engines, the combustion of air/fuel mixture is started by spark plugs which produce, for a 4 cylinder engine with 3000 rpm, more than 6000 sparks per minute inside the combustion chamber [1]. A spark plug is made mainly by a ground electrode and a shell. To withstand high temperatures, the ground electrodes are formed by a copper core and a high temperature corrosion resistant Nickel-based alloy mantel. Inconel 601 was chosen for its exceptional resistance to oxidation and corrosion at high temperatures. It was proved by Buscail et al. [2] that the Inconel 601 forms a protective oxide layer, and retains much of its strength at elevated temperatures. The copper core used in this study is a Cu-OF high purity copper [3]. Both materials are tamped, cold worked, annealed and finally welded to a steel shell (FR10 [4]) using a resistance braze welding technique, which consists of three principle phases called accosting, welding, and hold as shown in Figure 1a. This technique is frequently used in automotive [5–9].