Transcript SPEED LIMITER - Anil Chhikara

A
Familiarization
to
Speed Governor
Anil Chhikara
Motor Licensing Officer
Transport Department
GNCT, Delhi
SPEED LIMITER
CABLE MECHANISM TYPE
FUEL MANAGEMENT TYPE
SPEED GOVERNOR
Also called as
SPEED LIMITER DEVICE(SLD)
ELECTRONIC SPEED GOVERNOR
(ESG)
SPEED CONTROL DEVICE (SCD)
DEFINITION
Speed limiting device has primary function
to control the fuel feed to the engine in
order to limit the speed of the vehicle to a
specified value without effecting the other
performance parameter of the vehicle .
TYPES OF SPEED GOVERNOR
TYPE
PRINCIPLE
PERFORMANCE
MECHANICAL
Welding of iron strip or
bolt just below the
accelerator pedal to
restricts the engine rpm.
 Lack of power
 Pickup of vehicle falls
CABLE
MECHANISM
Microcontroller receives
the input signal from the
speed sensor and send
the signal out to the
actuator
Actuator cuts the fuel &
air intermittently and not
let run the engine above
prescribed speed.
FUEL
MANAGEMENT
Management of
calibrated fuel through
ECU to control the
vehicle speed.
Steady specified speed
is achieved without any
hiccups ensuring smooth
ride.
drastically.
MAIN COMPONENTS
 SPEED SENSOR
 ELECTRONIC
CONTROL UNIT
 ACTUATORS
 WIRING HARNESS
SPEED SENSOR
 REED SWITCH TYPE –
redundant/non reliable technology
HALL EFFECT TYPE –
latest / reliable technology
HALL EFFCT SENSOR
 The Hall element is a
small semiconductor
plate when a current is
pass through it in the
presence of magnetic
field generate voltage .
This voltage is
proportional to current
and the magnetic field.
This generation of voltage
is called Hall effect.
 Hall Effect Sensor
ELECTRONIC CONTROL UNIT
 This is an electronic
circuit contains an array
of
resistance
and
capacitors with a 32 bit
microcontroller, where all
the input signal are
analyzed and passing
through
the
whole
algorithms of software
then a suitable out put is
generated for final control
elements called Actuator.
Actuators
 The actuator is a
translation
of
the
converted controlled
signal in to action .
 It is an energy
conversion
device
having an electrical
input as signal and
force
and
displacement as an
output.
 Mechanical
 Electrical Solenoid
TEMPER PROOFNESS
 Vehicle speed should
not cross the set
speed if any of the
below condition
occurred.
 If sensor is bypassed
 If ECU is bypassed
 If wiring is bypassed
 If complete system is
bypassed
MECHANISM OF CABLE TYPE SPEED
LIMITER
Regulation of speed of vehicles
 Motor Vehicle Act , 1988 Sections
183,112,184,66
 Central Motor Vehicle Rules, 1989 , Rule 118
 Delhi Gazette Notification F. No
PCO/STA/II/2001PF-2/194 Dated 24 February
2003 & subsequent guidelines dated 17-02-2007
 SLD Standards AIS 018, IS :10250, IS : 9000
REGULATION /ENFORCEMENT ON
ROADS
In no case transport vehicle should run
above 40 kmph in Delhi roads.
ESG should not be tempered .
Seals of ESG should be intact.
ESG should not be removed .
Annual Maintenance Contract /History
card should be kept along the vehicle
documents.
MAINTENANCE OF ESG
Quarterly calibration and maintenance
services are mandatory.
No road side mechanic /unauthorized
technicians are allowed to repair the ESG.
In case ESG defective the vehicle is not
allowed to ply on hire – reward purpose.
The operator / driver may get
repairs/correction from authorized dealer
workshops.
Sealing locations
Location inside driver cabin
Electronic sensor cable
ECU
Accelerator Pedal
Accelerator linkages
Actuator Motor
Engine
Location Inside cabin or under chasses.
Gear Box
Speed sensor
Electronic By-passing with intact seals
By pass switch
Location inside driver cabin
Electronic sensor cable
ECU
Accelerator Pedal
Accelerator linkages
Actuator Motor
Engine
Location Inside cabin or under chasses.
Gear Box
Speed sensor
Tempering of the SLD





Main seals are located at the sub - assemblies i.e. speed sensor, ECU &
Actuator Motor
The other seals are fixed at accelerator linkages depending upon model of
ESG & vehicle which can be additional one or two.
The possibility of electronic tempering may not be ruled out even the seals
are intact, if the insulation of the sensor pulse wire is sheared off and the
earthed with the help of shunt (additional piece of wire) and with the help of
a switch located at convenient reach of driver.
The driver can by-pass the speed governor and the vehicle speed can
shoot up to his desire.
In case some other tempering is carried out the chances of SLD at working
mode will not be possible and will damage the electronic components.
SEAL LOCATIONS - a
At gear box / speed sensor
SEAL LOCATION -b
At ECU
SEAL LOCATION- c
 At throttle / linkages
THANKING YOU