During vehicle homologation, the correct functioning of the engine diagnosis functions need to be demonstrated. For this increasingly complex fault scenarios need to be identified. Realizing these failure patterns using faulty hardware is inflexible and requires a high effort. An alternative consists of manipulating the software calibration itself, which, however, is prohibited in some countries (USA/CARB) during homologation.

The modulation of electrical signals that are exchanged between the actuators/sensors and ECU represents another solution for generating realistic failure patterns in the engine and exhaust system. For this purpose the TOPEXPERT ASM Box (Actuator Sensor signal Modulation Box) has been developed. With its ruggedized electronics and housing, the system is designed for in-vehicle use and applications close to the engine. The ASM Box can modulate basic analog and digital as well as PWM signals. H-bridge circuits are available to drive actuators like an electronic throttle. For interaction with new generation smart sensors and actuators, CAN, LIN and SENT (J2716) interfaces are provided. The ASM Box also features the modulation of injection, crankshaft sensor and ignition signals. This enables the realization of complex injection fault patterns like cylinder-specific AFR deviations or misfires. Up to 5 injections can be controlled individually with respect to timing and quantity. A Break-Out-Box is used to conveniently connect the sensors and actuators. Replaceable loads to emulate the behavior of the actuators to the ECU are provided.

The Matlab/Simulink toolkit delivered with the system provides block libraries for setting up arbitrary fault simulation models which can be compiled and downloaded to the box. An XCP over CAN interface enables comfortable access by standard calibration tools.

The ASM Box - Motorcycle, Misfire, and Compact are supplied as standard in a waterproof case including all associated modules and cables. There is no standard case for the ASM Box - solenoid and piezo, but it is possible to order a suitcase separately.