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SB-106 PDF даташит

Спецификация SB-106 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «ABS».

Детали детали

Номер произв SB-106
Описание ABS
Производители National Semiconductor
логотип National Semiconductor логотип 

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SB-106 Даташит, Описание, Даташиты
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Adaptive Braking Systems
(ABS)
National Semiconductor
System Brief 106
October 1990
Anti-Lock Braking System 1 Channel
TL F 10856 – 1
SYSTEM DESCRIPTION
ABS refers to a number of devices designed to avoid wheel-
lock during hard and panic braking conditions These sys-
tems have gained world attention only in the past five years
but even the simplest system provides huge gains over
electro-mechanical systems Legislation for ABS continues
throughout most of Europe and is expected to be mandated
in the U S as well
Four wheel systems provide more security with both steer-
ability and stability and are second only to engine control in
electronic content ABS systems are designed around sys-
tem hydraulics sensors and control electronics These sys-
tems are dependent on each other and the different system
components are interchangeable with minor changes in the
controller software
ANTI-LOCK
Anti-Lock systems are low cost with one wheel sensor on
the differential one control circuit and a system controller
for primarily light truck and front wheel drive passenger
cars This improves stability and only affects the rear
wheels
ANTI-SKID
Anti-Skid systems provide the next level by adding control
to all wheels and includes three wheel sensors three con-
trol circuits and the system controller This system provides
both steerability and stability during heavy braking meaning
that a driver can maintain full control of the vehicle This
level may soon become law in the U S
ADVANCED ANTI-SKID
This upgrade of the previous system requires four wheel
speed sensors four control circuits and a high performance
control system This system provides greatly increased con-
trol decreased stopping distances split surface control
(dissimilar road surfaces) and automatic parameter adjust-
ment (to match weather changes) Presently this system is
used only on very high performance vehicles
C1995 National Semiconductor Corporation TL F 10856
RRD-B30M105 Printed in U S A









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SB-106 Даташит, Описание, Даташиты
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Advanced ABS System 4 Channel
TRACTION CONTROL
To control wheel ‘‘slip’’ during acceleration on slippery sur-
faces the control system must balance the torque at the
driven wheels and the friction from the road and tire sur-
faces Two of the most popular methods for controlling
torque are engine intervention and brake intervention
These techniques apply the brakes intermittently where
wheel ‘‘slip’’ has been determined to absorb excess engine
torque
Engine intervention techniques provide some means of con-
trolling torque by either fuel or spark timing adjustments
SYSTEM HYDRAULICS
The hydraulic system in the vehicle is augmented by the
addition of special hydraulic solenoid switches which allows
the control unit to modulate the brake pressure on each of
the controlled wheels The number of wheels controlled de-
pends on the configuration selected by the manufacturer
Typically an Anti-Lock system has one control circuit which
acts on both of the rear wheels while an Anti-Skid system
has three control circuits one for the two rear wheels and
one for each of the two front wheels
These hydraulic switches allow the brake pressure to be
increased decreased or held constant during ABS control
of the circuit In the non-operating mode the switches are in
the pressure increase position which under normal driving
conditions equates to flow through position Control circuits
are either one three-position switch or two two-position
switches again depending on the manufacturer
Recently a great deal of attention has been given to the
use of Pulse Width Modulated (PWM) pumps which act as
TL F 10856 – 2
pressure boosters on each of the control lines This form of
control is not only more accurate but avoids many of the
traditional problems associated with relatively slow switch-
ing solenoids PWM control will be the next hydraulic system
advancement for ABS both in performance and in cost
SYSTEM ELECTRONICS SENSORS
Several different parameters must be checked during nor-
mal driving as well as during ABS braking Possibly the
most important input(s) is that of the speed sensor In the
form of a reluctance sensor it reads the passing teeth on a
gear on the wheel hub The sensor outputs a sinusoidal
wave form which must be changed to a digital wave propor-
tional to wheel speed
In addition there are several on off (digital) inputs which tell
the processing unit if the brake pedal has been depressed
if brake fluid is insufficient and if the parking brake is on
PROCESSING
This unit reads the speed sensors to determine both wheel
and vehicle speed and if an ABS event is occurring and
ABS control functions need to be performed This can in-
clude eight solenoids with feed lock loops continuous self
and system diagnosis service interface and a display of
system status The substantial control requirements of an
advanced ABS system requires a very high performance
controller
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SB-106 Даташит, Описание, Даташиты
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4 Wheel Anti-Lock Braking 4 Channel
TL F 10856 – 4
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Номер в каталогеОписаниеПроизводители
SB-106ABSNational Semiconductor
National Semiconductor

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