2.2 CYLINDER PRESSURE SENSORS FOR ENGINE DEVELOPMENT
The ZI22 is a spark-plug with integrated pressure sensor. The new M10
design has a small eccentricity of the center electrode which allows the
ignition to behave in nearly the same manner as the original spark plug.
In order to maximize the electric strength of the insulator, an increased
ceramic diameter and a complete new design of the sensor membrane
is used. All this results in an impressive measurement performance
and highest reliability. The insulator of the spark-plug is manufactured
by Bosch. The sensor could be equipped with SIC for SDM.
SPECIFICATIONS
Measuring range 0 … 200 bar
Overload 250 bar
Sensitivity 11 pC/bar nominal
Linearity ≤ ± 0.3 % FSO
Calibrated ranges
1) surface temperature around the HEX < 200 °C
2) at 7 bar IMEP and 1,300 rpm, diesel
3) at 9 bar IMEP and 1,500 rpm, gasoline
0 … 80 bar
0 … 140 bar
0 … 200 bar
Natural frequency ~ 150 kHz
Acceleration sensitivity ≤ 0.0001 bar/g axial/radial
Shock resistance ≥ 2,000 g
Insulation resistance ≥ 1*1013 Ω
Capacitance 3.5 pF
Sensor operating temperature
range 1) - 40 … 350 °C
Thermal sensitivity change ≤ ± 0.3 %
200 ± 50 °C and
0 … 200 bar typ.
Load change drift 2 mbar/ms max. gradient typ.
Cyclic temperature drift 2) ≤ ± 0.5 bar
Thermo shock error Δp 3) ≤ ± 0.4 bar typ.
Temperature of plug-seat ≤ 230 °C permanent
Spark-plug insulator resistivity ≥ 108 Ω at 20 °C, 1 kV
Burn-off resistance 6 kΩ at 20 °C, 1 kV
Electric strength
45 kV
(ISO 11565, 3.7.2)
Eccentricity of insulator 1.25 mm
Thread diameter M10×1
Cable Connection M3×0.35 negative
Weight 33 grams without cable
Mounting torque
10 … 15 Nm using SF01
(into spark plug bore)
ZI22
SCOPE OF SUPPLY
Sensor ZI22
Piezo-input cable CI33-1
Coupling CC41
Gasket SG32
Accessory kit (protection cap + 2 o-rings)
Calibration sheet
Documentation
60