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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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104 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
7.11 Data Element: DE_BrakeBoostApplied
Use: A data element which when set to "on" indicates emergency braking.
This data element is an on/off value which indicates engagement of the vehicle's brake boost assist
function. Brake boost assist is available on some vehicles. It detects the potential of a situation requiring
maximum braking and pre-charges the brake system even before the driver presses the brake pedal. This
situation is detected either by measuring a rapid release of the accelerator pedal or via a forward sensing
system. Some systems also apply full braking when the driver presses the pedal, even with a light force.
Multiple probe data reports re activation of brake boost at the same location is an indication of an
emergency situation on the road and is therefore of use to road authorities.
ASN.1 Representation:
BrakeBoostApplied ::= ENUMERATED {
notEquipped (0),
off (1),
on (2)
}
XML Representation:
<xs:simpleType name="BrakeBoostApplied" >
<xs:annotation>
<xs:appinfo>
notEquipped (0)
off (1)
on (2)
</xs:appinfo>
</xs:annotation>
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:unsignedInt">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="2"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="notEquipped"/>
<xs:enumeration value="off"/>
<xs:enumeration value="on"/>
</xs:restriction>
</xs:simpleType >
</xs:union>
</xs:simpleType>
In addition, this item may be used by data structures in other ITS standards.
7.12 Data Element: DE_BrakeSystemStatus
Use: A single 2-byte long data element combining multiple related bit fields into one byte.
ASN.1 Representation:
BrakeSystemStatus ::= OCTET STRING (SIZE(2))
-- Encoded with the packed content of:
-- SEQUENCE {
-- wheelBrakes BrakeAppliedStatus,
-- -x- 4 bits
-- traction TractionControlState,
-- -x- 2 bits
-- abs AntiLockBrakeStatus,
-- -x- 2 bits
-- scs StablityControlStatus,
-- -x- 2 bits
-- brakeBoost BrakeBoostApplied,
-- -x- 2 bits
-- spareBits