Knock Detect

The simple method of knock detection. Engine-typical knock configurations for MAN, LIEBHERR, MITSUBISHI, DEUTZ MWM are already stored in the device.
Other engines can be calibrated and imported on request in advance and the parameters adapted accordingly.
Depending on the design of the engine you will need 1 – 4 knock sensors and a trigger pulse from the ignition coil of cylinder 1.

Installation is simplified with pre-assembled cables for the triggering of the ignition coil of cylinder 1 and to the knock sensors, along with special mounting bolts for the sensors.

No additional software is required. For programming and PC-based diagnostics, simply connect the device to the network of your computer. The user interface of the KnockDetect is displayed via the integrated Internet browser.

The device has 8 digital inputs. 2 of these are assigned fixed functions:

  • “RUNNING” shows the device that the engine is running synchronously with the network.
  • “50% LOAD” shows that the power delivery is ≤ 50% of the nominal power output.

Both inputs can be used to switch the evaluation on or off.

3 digital outputs are available to signal the following to the CHP controller:

  • KNOCK! – the engine is knocking
  • STOP – the engine must be stopped in the normal way
  • E-STOP! – an immediate EMERGENCY STOP is required (E-STOP = EMERGENCY STOP)

The outputs can be freely configured (including overlapping).
Every digital output can be loaded with 5 – 50 V DC / AC up to 100 mA.
4 outputs jointly share a return conductor.
The digital outputs are all short-circuit proof.

Two digital outputs and one additional analogue 0 – 20 mA output are available for adjustment of the ignition timing.

These outputs can be adjusted so that one output switches and adjusts the ignition timing above a defined knock window. The 4 – 20 mA output can be freely configured.

In addition, two further digital outputs and one analogue 0 – 20 mA output are integrated for adjustment of the engine power output.

The Knock Detect system also has 2 digital interfaces that can be used to read and write all relevant data.

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