1) Brief Chart & Stitch
Function: The intake manifold pressure is related to the opening of the throttle, which reflects the size of the
engine loading, so it can be considered as information of Since
the intake temperature has
some effect on the quality
of the intake air, the intake
air temperature should be
measured so as to correct
the air intake volume.
Stitch
：
No.1 Grounding
No 2 Output Temperature Signal
No 3 connected to 5V
No 4 Output Pressure Signal
2
）
Working Principle
The absolute pressure sensing element of intake manifold is made up of a piece of silicon chip. And a piece
of pressure film was etched from the silicon chip. There are four piezoelectricity resistance on the pressure film,
which will compose a Wheatstone bridge as strain element. Except the pressure film, there is also an integrated
signal processing circuit on the silicon chip. Silicon chip and metal shell buildup a close reference space, absolute
pressure inside the reference space is close to zero. This forms a micro electricity machine system. Activity
surface of silicon chip endure a pressure close to zero, its back endure a intake manifold absolute pressure(not test
yet) which pulled into by a hose. Thickness of silicon chip only few microns, the change of absolute pressure of
intake manifold will make silicon chip get mechanical deformation, 4 voltage resistance units also change shape,
its resistances change. After process of signal processing circuit of silicon chip ,get the pressure signal with a
linear relation to pressure.
The inlet temperature sensing element is a resistance of negative temperature coefficient (NTC), and the
resistance varies with the inlet temperature, the sensor will feed the controller a voltage shown the change of the
inlet temperature.
3) Technical Specification
Value
Scope
Min Model Max
Unit
Pressure Measuring Scope
20
115
kPa
Operational Temperature
-40
125
℃
Operational Power Supply
Voltage
4.5 5.0 5.5 V
Electric Current while Us=5.0V
6.0
9.0
12.5
mA
Load Current of Output Circuit
-0.1
0.1
mA
Load Resistance
50
k
Ω
