Three kinds of ignition methods commonly used in motorcycles

Three kinds of ignition methods commonly used in motorcycles

Motorcycle ignition a variety of ways, there are three commonly used: capacitive discharge magnetic motor ignition, capacitor discharge battery ignition, inductive discharge battery ignition. The three ignition modes are different and can not be used interchangeably.

The capacitor discharge ignition method

Most of the modern motorcycle is the use of capacitive discharge type electronic igniter, commonly known as cdi. Capacitive discharge Ignition is dependent on the charge and discharge of the capacitor to generate the ignition energy pulse, provided to the primary of the ignition coil, in the secondary coil induction of the high voltage, spark spark spark. Capacitive discharge ignition system according to its different power supply, can be divided into capacitive discharge magnetic motor ignition system and capacitor discharge battery ignition system. In the case of

1, capacitive discharge type magnetic motor ignition system

FIG 1 is a capacitive discharge type magneto ignition System Diagram, charging coil induced voltage is a positive-negative alternating in the positive half weeks EMF, the battery through the rectifier diode vd1 half-wave rectifier, a pulsating direct current to the capacitor c charging The The thyristor scr is the electronic switching element of cdi whose trigger conduction is effected by the induction pulse of the trigger coil 12, and when the magnet motor flywheel turns to the ignition position, the positive pulse of the trigger coil l2 is supplied to the thyristor scr gate Trigger current, so that SCR gauge trigger conduction. At the moment when the thyristometer scr is triggered, the capacitor c is rapidly discharged through the thyristor anode and cathode to the primary coil of the ignition coil. The discharge current causes the magnetic flux of the ignition coil to change rapidly and is sensed on the secondary coil l4 Piezo, spark spark sparking.

Capacitive discharge magnetic motor ignition system is simple, inexpensive, easy to use. However, due to magneto direct power supply, the terminal voltage of the capacitor influenced by the engine speed, the capacitor is charged at high speed and low energy shortage, leading to weak ignition energy, likely to cause cold start problems, high-speed performance degradation. In order to solve the capacitor in the low-speed and high-speed charging energy shortage problem, many high-end motorcycle with direct power supply DC cdi (dc-cdi).

2, capacitor discharge battery ignition system (dc-cdi)

Dc-cdi igniter mainly by the boost, oscillation circuit and trigger circuit composed of two parts, as shown in Figure 2. Converter is a small transformer, the battery 12v voltage inverter into a high voltage of about 300v to the capacitor c charging. Ignition time detection circuit to complete the different speed of the ignition ahead of the angle of control, so that the engine work in the best condition. With automatic adjustment of the ignition advance angle function cdi said acdi. acdi equipped with automatic adjustment of the ignition advance angle of the device, the ignition time can change with the engine speed and self-adjustment, so that the motorcycle driving more smoothly, burning more complete, more environmentally friendly emissions. acdi more than ordinary cdi can significantly improve the dynamic performance of motorcycles, economic speed range of about 96%; saving 10% -25%; the maximum speed increased by 10% -25%; exhaust pollution reduced by 15% -40%.

The inductive discharge type ignition method

Inductive discharge type ignition method is to rely on disconnect the ignition coil of the primary circuit pulse, in the secondary coil induced high pressure, so that spark spark spark. This ignition method due to the use of transistors as a switching element, it is also known as the transistor ignition system. Design of Induction Discharge Battery Ignition System. Closed ignition switch k, transistor vtr (r for the subscript) in the conduction state, the current flows from the battery to the ignition coil primary winding l1. When the engine is started, the pulse coil l3 AC signal is generated, to the time point p to a positive direction, transistor vtr (r is a subscript) remains conductive state; for p points - when the direction transistor vtr (r is a subscript) is turned off, In this way, the current of the primary winding l1 is cut off, the magnetic flux of the ignition coil changes rapidly, and the high voltage is generated in the secondary winding l2, and the spark plug is sparks.

Motorcycle start (foot start method)

A, scooter to pinch the brake handle, slightly with a little throttle, riding a car to close the choke.
B, first try to step on the foot to start the lever, so that the engine rotation, feel the compression resistance, the foot lift rod back to the highest point, and then depressed, the action should be fast, forced to continuous, so the probability of success will be high some.
C, the foot start requires some experience and skills, began to start with the foot, the success rate may not be high, the user needs, you can go to the maintenance point, by the service personnel on-site demonstration.