Knock Detection System

Depending on the engine design, you will need one to a maximum of eight knock sensors.The trigger signal for the start of the ignition sequence is generated by a pulse that originates either from the ignition coil on cylinder 1 (gas engines) or from a sensor in the mechanical or electronic fuel injection system (diesel and jet engines).Pre-assembled cables for triggering and connecting to the knock sensors, as well as special mounting bolts for the sensors, simplify installation.No additional software is required. To configure the device and perform diagnostics during operation, connect the Knock Detect to your computer’s Ethernet port. The user interface is displayed on the PC via the installed web browser.The device has eight digital inputs, two of which are assigned fixed functions:“RUNNING” means that the motor is running in sync with the grid. “50% LOAD” indicates that the power output is ≤ 50% of the rated power.There are also three digital outputs that signal the following to the CHP control system:KNOCK! – the engine is knocking STOP – the machine must be shut down normally E-STOP! – an immediate EMERGENCY STOP is required!The outputs can be freely configured, including in combination. All digital outputs are short-circuit-proof. Each digital output can handle 5–50 V DC / AC up to 100 mA. Four outputs share a common return conductor. Two digital outputs and an additional analog 0–20 mA output are available for adjusting the ignition timing. These outputs can be set so that, within a defined knock window (intensity, duration), an output switches and adjusts the ignition timing. In addition, two further digital outputs and an analog 0–20 mA output are integrated for adjusting engine power. The Knock Detect also features two digital interfaces that can be used to read and write all relevant data:The previous device variants with (1) RS232 and RS485/Modbus or (2) Profibus and CANopen have since been replaced by a universal successor model (Part No. 2010005).