Idling Stop ECUs

Scooters are very common as a handy and simple means of transportation in the ASEAN regions and India in particular.
Recent scooters are often equipped with "idling stop systems", which decrease unnecessary fuel consumption, exhaust gases, vibration, and noise when idling.
An I/S compatible engine control unit is an integrated unit which incorporates engine control, motor control, and regulator control. An I/S compatible engine control unit determines when to implement I/S based on vehicle speed, engine RPM, accelerator position, and other information, and stops the engine through FI (Fuel Injection) control stops, and controls restarts.

Engine control

Engine RPM is controlled through fuel supply control, ignition control, and solenoid control.

Fuel supply system

FI is one method of supplying fuel to the inside of the engine, and is the current mainstream fuel supply system which has replaced the fuel supply system that was carried out by a carburetor until recently.


Full transistor type ignitions, which have weak ignition power but long spark duration, are often used for FI systems which supply only the minimum amount of fuel required, while CDI type ignitions, which have high ignition power but short spark duration, are commonly used for carburetor type fuel supply systems, and our company has also developed numerous CDI units.

Our idling stop ECU plays two roles: controls the start motor and controls the battery charger. In addition, the ECU is for environmentally-friendly vehicles that integrate all the main functions that are needed in electrical components used for motorcycles.

  • Main functions for idling stop ECU

Conventional motorcycles generally have a structure with two motors: a startup motor and a battery charging motor. However, a system that uses this ECU is able to control the startup and battery charging on one motor.

  • 3-phase fully controlled bridge circuit Start motor control operation
  • 3-phase fully controlled bridge circuit Battery charging control operation

Use and Compatibility

Use Start motor control, battery charging control, fuel injection and ignition control
Compatible products Motorcycles


Provides smooth engine startup and supports idling stop

Start motor control, charging control, and ignition and injection control can all be handled on one ECU, as well as offering idling stop, low gas emissions and low fuel consumption.

The start motor control circuit and charging control circuit both use the same MOSFET 3-phase fully controlled bridge circuit

The control system uses phase control.
Our own MOSFET is used and features the lowest loss in its class, which helps reduce the heat that is generated and make the unit more compact.

LED H/L onboard driver

The ECU is equipped with a LED H/L driver that uses a fixed-current converter. This produces stable lighting even when there is battery voltage fluctuation, load variation or temperature fluctuation.

Supports 48 V batteries and offers assist control using the starter ACG

The role of the starter control up until now was only starting and charging. However, our high output starter ACG supports a 48 V battery, which enables it to assist the engine during startup and acceleration, making the acceleration smoother and improving the fuel economy.

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