Humanetics HITECSENSORS 01184 User manual

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IR TELEMETRY
STEERING EFFECT
SENSOR
(MODEL 01184)
OPERATING MANUAL

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CONTENTS
Introduction 3-4
System Overview 3
System Components 3-4
Installation 5-7
Installing The System 5-7
Operating The System 8
Calibration 8
Collecting Data 8
Overview Of System Electronics 9-13
Infra-Red (IR) Transmitter 9
IR Receiver/Encoder to Analog Converter 10
CAN Output (Optional) 11
Appendix 14-17
Specications          14-16
ServiceWarranty         16
Repair Services 17
15July2021_OM04/1

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SYSTEM OVERVIEW
HITEC Sensor Developments IR Telemetry Steering Effort Sensor (Model 01184) is designed to measure the amount
of effort needed to turn the steering wheel and the angular position of the steering wheel.
This system provides:
• A 10 in. through-hole for uninhibited deployment of an air bag without the danger of the sensor being projected at
the driver.
• A low mass-moment of inertia.
• Dual resolution for angular measurement (0.2º or 0.05º), and
• Non contacting torque signal transmission which permits unlimited wheel rotation
SYSTEM COMPONENTS
The system consists of the following:
• A steering effort sensor with.
• An Infra-Red (IR) telemetry transmission system
• An angular position sensor, and
• An analog converter
The Steering Effort Sensor
The steering effort sensor is an auxiliary steering wheel with 12 in. OD. The sensor mounts to the vehicle’s steering
wheelwithfourcableties.Thesensorhasfouradjustablemountingplatestotsteeringwheelsfrom14.5-16in.
OD.Thesensorhasa2.6in.offsetfromthesteeringwheel.(Seeillustrationonnextpage.)
The IR Telemetry Transmission System
The non-contact data coupling system consists of the IR transmitter (built into the steering sensor), a near-by
IR detector (mounted on the encoder housing), and the receiver. Power to the transmitter is supplied by a 9 Volt
battery.Thereceiverispoweredby11-16VDCvehiclepower.
Note: HITEC Sensor Developments recommends replacing the transmitter battery at the beginning of each test day.
INTRODUCTION

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The Angular Position Sensor
The angular position sensor is an optical encoder mounted on the inside of the front windshield. A drive train
assembly rotates the drive shaft attached to the encoder as the steering wheel sensor is turned. When the chain is
installed, and both gears are properly aligned, the IR emitters in the sensor are also properly aligned with the IR
detector mounted to the encoder housing.
The receiver (Figure 3) produces analog outputs from both the torque sensor and the encoder.
Figure 3: The IR Receiver/Encoder to Analog Converter
Figure 2: Angular Position Sensor

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INSTALLING THE SYSTEM
To install the system:
Step 1: Mount the steering effort sensor to the vehicle’s steering wheel.
A. Position the sensor so that it rests rmly against the front of the steering wheel.
B. Adjust all four mounting brackets for the proper t. Make certain to adjust all four brackets symmetrically.
C. Tie the steering effort sensor to the steering wheel using one cable tie for each of the four mounting brackets.
D. Pullthecabletiesrmlytotighten,andthentrimtheties.(Ifnottrimmedthetiesmayinterferewiththe
drive train.)
Step 2: Mount the angular position sensor to the inside of the windshield.
A. Push the gear all the way up the linear ball slide, and place the positioning pin through the holes in the front
and rear of the optical encoder to limit its travel to the midpoint.
INSTALLATION
Figure 4: Step 1B - Mounting brackets
Figure 5: Step 2A - Optical encoder

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B. Place the drive chain around the gear of the steering effort sensor.
C. Position the angular position sensor on the windshield so that:
• The angle encoder is NOT in the drivers direct line of vision
• The drive chain is taut
• The encoder gear is in the same plane as the gear on the steering wheel
D. Attach the angular position sensor to the windshield by pumping the suction cup’s plunger. Pump it until
the red stripe is no longer visible.
E. If necessary, adjust its position by loosening the knobs and sliding the bracket to the correct position
(see gure2).
F. Adjust the angle of the encoder so the arrow on its label is pointing directly toward the center of the
steering wheel by loosening and the tightening the ball and socket joint.
G. Remove the positioning pin from the front and rear holes of the angular position sensor, and place it
through the side holes.
H. Rotate the steering wheel to ensure that the encoder (on the angle position sensor) can travel along the
linear ball slide without restriction.
The IR telemetry emitters and detector are now properly aligned as well.
Figure6:Step2C-Positioningtheangular position sensor

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Step 3: Connect the angular position sensor (encoder) to the receiver. The IR detector’s power and digital data
signals are also carried through this cable/connector.
Step 4: Connect the encoder signal outputs of the receiver to the data acquisition system.
Step 5: Connect the torque sensor signal outputs of the receiver to the data acquisition system.
Step 6: Connect a 9V alkaline battery to the sensing element. Use the power switch to control power to the
transmitter.
Note: HITEC Sensor Developments recommends installing a new battery at the beginning of each test day.

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OPERATING THE SYSTEM
CALIBRATION
This unit was calibrated at the factory. Calibration sheets have been provided with the unit specifying what each output
will provide for a given input. The calibration on the torque output can be measured very accurately using the shunt cal.
Refer to Figure 7 for location of the shunt button. When the shunt button is pressed, a resistor is placed across a leg of
the bridge, which produces a very repeatable simulated torque on the sensor. The shunt button is a momentary type
button and will release the shunt when the button is released.
To calibrate the torque sensor to the data acquisition system:
Step 1: Place the steering effort sensor at the desired neutral position.
Step 2: Adjust the “zero” potentiometer until the output voltage is 0 volts.
Step 3: Zero/tare the data acquisition system.
Step 4: Press the shunt calibration button on the sensing element and measure the simulated output produced. The
 outputshouldreectthenumberonthedatasheetprovidedbythemanufacturer.
Step 5: Input the simulated torque value to the data acquisition system.
Step 6: Alternate... use the capacity and full scale output numbers provided on the data sheet for the values entered into
the data acquisition system. Use the shunt to verify cal.
Theangleoutputsdonothaveasimplemethodofverifyingcalibration,andifmorethana“ballpark”vericationis
needed,ananglexturewillberequired.
To calibrate the angle outputs to the data acquisition system:
Step 1: Place the steering effort sensor at the desired zero position.
Step 2: Momentarily press the encoder zero button on the receiver. See Figure 9 for location of this button.
Step 3: Zero/tare the data acquisition system on each encoder channel.
Step 4: Enter into the data acquisition system the range and output values from the data sheet provided with the sensor.
COLLECTING DATA
Torque and position data are transmitted automatically and continuously when the system is powered up.

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OVERVIEW OF SYSTEM ELECTRONICS
INFRA-RED (IR) TRANSMITTER
Thetransmitterconsistsofastraingageamplier,a4polelowpassbutterworthlter,analogtodigitalconverter,
controlelectronics,andanarrayofIRLED’s.Thebasicoperationisthat,whenpoweredup,thetransmitterampliesthe
signalfromthetorquesensor,ltersit,digitizesitandsendsitoutbypulsingtheIRemitterstotransmitthecode.
Under normal operation, the power indicator (see Figure 7) will blink indicating that the unit is powered up and
transmitting normally. The power switch (Figure 7) controls power to the unit.
The shunt button is used to verify calibration of both this sensor, and any subsequent data acquisition system. It is a
momentary switch that, when pressed, applies a shunt resistor to the sensor bridge. This has the effect of producing
a simulated output from the sensor, and likewise, a signal will be produced at the receiver’s output. The shunt is very
repeatable and calibration information for its effect is documented in the calibration data provided with the sensor.
All data sent from the transmitter are encoded with a CRC. This is an error detection scheme that is used by the receiver
to tell if the received data was good. When the transmitter’s battery gets low, the transmitter will intentionally corrupt
the CRC before sending it. The receiver will continually see the transmission as in error. In addition, the transmitter’s
powerindicatorwillstopashing,turningsolidred.Replacethetransmitter’sbatterywhenthisoccurs.
Figure 7: Infra-Red (IR) Transmitter

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IR RECEIVER/ENCODER TO ANALOG CONVERTER
The receiver consists of an Infra-Red detector unit (mounted at the encoder), control electronics, digital to analog (D/A)
convertersandbuffer/lters.Basicoperationis:
Step 1: Connect to the required signal outputs as shown in Figure 8a or 8b.
Step 2: Connect the encoder as shown in Figure 9.
Step 3: Connect power to the power input pins as shown in Figure 9 and turn on the power switch.
Figure 8a: IR Receiver PT Style Connections, Side 1
Figure 8b: IR Receiver Optional BNC Style Connections, Side 1
Figure 9: IR Receiver Connections, Side 2