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AUTOMOBILE SENSOR MODULES
Stepper and DC Motor Modules
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
Both modules plug straight into one of the plug-in module slots.
All the interface and drive circuitry is provided and both units can
be operated immediately with ready to go software. Users can also
develop their own applications software.
a) Stepper Motor Module
The module is based on a 12V bipolar 7.50 rotation per step
variable reluctance motor. Two LEDs are provided. One of indicates
direction, the other receipt of pulses.
b) DC Motor Module
The module is based on a 5.9V compact disc player spindle module.
Temperature/Speed Control Unit
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
a) Speed Control
The speed control section comprises a DC motor driving a
ferromagnetic toothed wheel, whose rotational speed is monitored by
a reluctance sensor and a reflective optical switch. The digital
outputs from the sensors are fed into the EDP via a pair of digital
inputs. The motor speed is controlled using a pulse width modulated
wave train generated on a digital output from the EDP.
b) Temperature Control
The temperature control section comprises a heater and heat sink,
DC fan and two temperature sensors, namely a semiconductor type
(LM35) which acts as a reference and a NTC thermistor. The
temperature of the heat sink can be controlled at a predetermined
value through control of fan and heater.
The board uses a L293D four channel line driver to drive the DC
motor, DC fan and heater, which are each controlled by pulse width
modulation. The module plugs into the applications area of the EDP
motherboard and is connected by means of ribbon cables to slots 1
and 2 of the sensor area.
Suspension Module
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
This module is a small scale realisation of a wishbone type
suspension module and features a piezoelectric bimorph transducer.
The system spring is represented in the model by a rectangular
section strip material to ease analytical modelling. The system is
set in motion by a 'rolling road' consisting of a DC motor and CAM
and by means of the piezoelectric element dynamic stress and/or
deflection values occurring in the module can be measured and
displayed.
Lighting Cluster
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
The module consists of a rotating "Head Lamp" and a
flashing direction indicator. The Head lamp is deployed by means of
servo motor activated by the EDP. The unit features sensing devices
e.g. optical flag device, light dependent resistor and other
electronic techniques for full on-line remote diagnostic testing.
Diagnostic test include bulb and flasher lamp integrity, deployment
of head lamp, flasher operation etc. The device plugs into two
applications slots on the EDP.
Liquid Level Module
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
This module, which plugs into a single applications slot on the
EDP, simulates the rise and fall of liquid in the fuel tank or
clutch/ brake reservoir in a motor vehicle. It features three
different sensors, rotary potentiometer, reed switch and, Hall
effect device. A rotary potentiometer, attached to the float arm
provides an analogue voltage proportional to liquid level. A small
magnet activates the reed switch/Hall device, to indicate the
approach of the full or empty condition.
Anti-Knock Sensor Module
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
This module provides an electronic simulation of knocking in an
internal combustion engine and its correction by retardation of the
firing angle. The characteristic sound of knocking is reconstructed
electronically in a metal cylinder and the vibrations detected by
means of a piezoelectric crystal. The resulting signal is
conditioned and fed into the EDP, which simulates a change in firing
angle to reduce the knock to zero.
Air Mass Flow Module
Information on airflow to internal combustion engines is essential
for air/fuel mass ratio control. This module illustrates the
principles underlying the operation of automobile air mass flow
transducers based on the heat transferred to, or from, thermometric
elements placed in laminar air streams. The unit provides integral
Wheatstone bridge measurement and control circuitry to generate a
flow related analogue voltage signal for capture and display by the
EDP.
Anti-Lock Braking System
fig: Automotive Transducer Kits
Click on the picture to go to the Picture Gallery
This module is intended to illustrate the basic principles of
anti-lock braking. An optical sensor is used to measure the speed of
rotating wheel, which is driven by a D.C. motor. The wheel can be
brought to rest by means of a simple braking mechanism controlled by
the EDP. The speed of rotation of the wheel is monitored and the
brake released before the wheel is brought to rest. The module plugs
into a single applications slot on the EDP system.
Air Conditioning Sensors Module
This module features two resistive temperature sensors and humidity
sensor. A stream of air is heated or cooled and blown by a_s fan
into a_s chamber containing a temperature and humidity sensor where
temperature and humidity, above or below ambient, is measured. The
values are sampled, digitised, and recorded under control from the
EDP. The temperature, humidity and air flow can all be varied. The
module occupies two plug-in applications slots on the EDP
applications slots on the EDP system.
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designed by CARO Emmanuel
Copyright ©1998 Monisys
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