IAV Knock Indication System (KIS) – Generation 4

Spontaneous ignition events occurring in a spark-ignition engine cylinder before the actual flame front are known as knocking combustion. They can result in anything from irritating noise to a damaged engine. To identify knock reliably, we have developed the Knock Indication System.

The Generation 4 Knock Indication System – KIS4 for short – is a powerful measurement instrument for computing, displaying, evaluating and recording knock-specific and thermodynamic parameters. The instrument receives signals from pressure sensors in the combustion engine’s cylinders. A digital signal processor uses signal curves as the basis for computing various parameters in real time – such as maximum cylinder pressure and peak knock-value pressure which – in turn – infers knock behavior. The KIS software displays readings online and uses the pressure curve for computing statistic parameters, such as knock condition and knock frequency. A user-configurable CAN interface makes all measured values and statistical variables available for other components.

KIS4 is ideal for calibrating knock-control systems. It can also be used for monitoring knock activity in engine calibration as well as for detecting instable combustion and misfiring. Its compact design and 12-volt connection not only make it the perfect choice for application on the test bench but also for direct use in the vehicle. KIS4 is an attractively priced alternative to standard indication systems for delivering key thermodynamic variables.

The service we provide includes regular software updates, starting KIS up for you and training your staff on how to use it. At your request, we will support you in positioning knock sensors and in calibrating knock control systems from all leading engine controller brands.

Technical Specifications

  • Eight user-configurable input channels (pressure signal, knock-sensor signal, other analog signals)
  • Resolution: 16-bit
  • Sampling rate: 400 kHz per channel
  • Input voltage range: from -10 V to +10 V
  • Maximum engine speed: 8,000 rpm
  • Selected measured variables: peak pressure of absolute knock value, ∆p85 knock value, noise integral, maximum pressure signal, position of maximum pressure, different mean effective pressures, position of 10%, 50% and 90% energy conversion, NMEP coefficient of variation
  • USB 2.0, CAN