Projects and references

Glow plug with integrated pressure sensor

Hidria's plug with an integrated pressure sensor (Hidria PSG) contributes to the reduction of fuel consumption and exhaust gas emissions by modern diesel engines.

This product is based on state-of-the-art design and, by virtue of its mechanical sophistication and integrated electronic hardware and software, it is definitely an inherent component of modern diesel drivelines and future vehicles.

The glow plug, already one of Hidria’s most advanced and successfully marketed achievements, was further enhanced with a sophisticated high-tech system that enables the transmission of combustion chamber pressure data directly to the central engine computer. The latter, utilising the pressure data, accurately controls fuel injection and other key parameters for optimal combustion. The main advantage of the Hidria glow plug is its extremely accurate measurement, repeatable in the shortest time intervals. Innovative solutions applied in the glow plug with pressure sensor are results of in-house and foreign knowhow and are protected by seven patents.

March 2014 – An article in the Engine Technology International magazine. More ...

January 2014 – Hidria PSG function (measurement of cylinder chamber pressure)

For the purposes of closed-loop control of the engine, we developed a glow plug with an integrated pressure sensor based on a piezo-electric element. Hence, this is a pressure sensor that does not require any reengineering of the engine cylinder head, since the sensor is integrated into the existing glow plug. Pressure force is transmitted through the glow plug heater onto the piezoelectric element, which generates a corresponding electric charge. In a specialised integrated circuit (ASIC), this charge is converted to a voltage signal, which is also filtered in the ASIC, as well as conditioned by algorithms to eliminate any undesired artefacts from the signal. The sensor can be integrated in either a glow plug with a metal heater or a glow plug with a ceramic heater. The pressure sensor is capable of measuring pressures up to 220 bar, with an accuracy exceeding 2 % throughout its measurement range. It further excels in extreme measurement accuracy at low pressures (0–5 bar). The sensor provides a high quality signal in a frequency range up to 5 kHz.

September 2012 – An article in the Engine Technology International magazine. More ...

September 2011 – The first article in the Engine Technology International magazine. More ...

June, 2011 – The first presentation of the product to the professional community at the Engine Expo trade fair in Stuttgart, Germany.