Ignition Module: Component That Controls Ignition

1. Introduction to Ignition Module

The ignition module, also known as the ignition control module, controls the working state of the ignition coil. Some ignition modules provide feedback signals for the ECU to determine whether the ignition coil is working correctly. And some provide feedback signals to calculate the width of the next conduction pulse.

The ignition module is actually a power electronic switch. The signal controlling the ignition is a square wave or magnetic pulse signal. It is delivered to the input terminal. The signal turns on and off the power electronic switch.

This controller uses the pulse width to control the on-time. After conduction, the current in the ignition coil rises with an approximately exponential characteristic. The longer conduction time results in the stronger disconnection current, so the ignition energy of the coil can be controlled. The trailing edge moment of the pulse signal handles the off time. In other words, it controls the ignition moment.

The early ignition module for the distributor ignition system has a speed closure angle adjustment circuit. This is because the pulse width of the control signal inputs from the distributor decreases as the engine speed increases.

To ensure the basic consistency of ignition energy, the closing angle of the control module is adjusted from 30% at low speed to 70% at high speed with the increase of engine speed. This process is automatically adjusted by the module circuit.

The control signal for modern engine ignition coils is transmitted by the ECU. The ECU takes charge of the width of the pulse signal and the ignition moment. Therefore, the ignition control module no longer comes with a closing angle adjustment circuit.

There are two combination types between ignition module and ignition coil. One is the integration of the ignition module and ECU. The power component to control the ignition coil is on the ECU. There is no module on the coil. The other type is the combination of ignition module and ignition coil together. The ECU only gives the control signal.

2. Essential Performance Parameters

●  Working temperature

The working temperature depends on the installation location. The engine temperature can be high. Some ignition control modules are installed at a temperature of 110°C. With the heat generated during engine running, the temperature will also increase. The actual temperature of the ignition module should be lower than the junction temperature of the transistor. The range is -40 ℃ to +125 ℃.

●  Working frequency

The working frequency of the ignition module depends on the engine speed and the coil configuration. The maximum frequency of the ignition module is 200 Hz. If there are four cylinders and each cylinder is ignited independently, the maximum frequency is 50 Hz. The ignition module should allow a higher working frequency than the maximum frequency.

●  Working voltage range

Considering the voltage fluctuation on the engine and low temperature starting, the working voltage is generally set at 6-16 V.

●  Static current

The static current is the current consumed by the ignition module circuit when there is no control signal. Some engine OBD systems have to detect the static current. If this value exceeds the specified value, the ignition control module can't be cut off. As a result, the ignition system does not work properly. It alarms.

●  Control signal

The control signals transmitted by the ECU to the ignition module are square pulses. The pulse width and the input moment can be controlled according to the engine speed, water temperature, voltage and various sensor signals.

For example, when the water temperature and the battery voltage are low (cold start), the primary conduction time must be lengthened to achieve the disconnect current required for ignition. At this time, the pulse width is automatically widened to ensure sufficient ignition energy.

Some engines have to monitor the voltage amplitude change of the input signal before and after the ECU is connected to the ignition control module. The OBD system monitors the working condition of the ignition system. If there is no input signal, the voltage at the ECU output terminal is 5V.

After the module comes into operation, the output impedance and the input impedance will match. The output voltage will drop to 3-4V at this time. The OBD system determines whether the ignition system is working normally. If it exceeds this voltage value, the alarm gets started.

●  Off delay time

The input signal flips from high to low. The delay time for the primary voltage of the ignition coil to rise to 100V should be less than 10 μs. This depends on the transmission rate of the input signal.

●  Power-off protection

When it is in a static state, the current of the ignition coil is delayed from turning off. That is, at the OFF state, the turn-off rate should be slow. The secondary high voltage is less than 1 kV. There will be no spark.

The power-off time set by the ignition module is related to the power voltage. There is a long time when the voltage is low, and vice versa. It is to prevent the ignition module and ignition coil from being damaged due to the high level of an input signal.

3. Reasons for Choosing Delcoribo Ignition Modules

Engines always work in tough operating conditions. To keep vehicles running smoothly, we should get trustworthy ignition modules to work well with ignition coils. Delcoribo provides this component to customers all over the world. Our ignition modules gather accurate information from engine sensors and determines correct ignition timing to generate spark.

Despite running up against high temperatures and terrible vibrations, Delcoribo ignition control modules ensure to be responsive. The advantage of automatic current limiting reduces heavy load to ignition coils. Mistimed ignition is horrible when the engine is running. Our manufacturing team works diligently and passionately to avoid bad parts.

Car owners want to find the same components as the original ones in the vehicle. Our products have features of easy installation and replacement. Drivers can replace the old ones by themselves.