2.5. Emergency Deceleration Control - EmrgDeceCtl

• Overview

• Functions

• Ports

• Parameters

Id	EmrgDeceCtl
Version	main
Title	Emergency Deceleration Control
System	Braking
Document Type	Application Software Component Specification Preview

2.5.1. Overview

This component is responsible for controlling the emergency deceleration feature of the vehicle. It monitors various inputs and determines when to activate or deactivate the emergency deceleration command based on predefined conditions and timeouts.

2.5.2. Functions

	Title	Description
1	Activate Emergency Deceleration	This function activates the emergency deceleration command when certain conditions are met, such as the emergency deceleration request being active for a specified timeout, the vehicle speed exceeding a threshold, and the feature being allowed.
2	Deactivate Emergency Deceleration	This function deactivates the emergency deceleration command when the conditions for activation are no longer met or when a cooldown timeout has elapsed after the emergency deceleration request has been deactivated.

2.5.3. Ports

	Id	Direction	Data Type	Dimensions	Unit	Keywords
1	EmrgDeceReq	Incoming	boolean	[1]	inherit	Emergency Deceleration Request
2	EmrgDeceReqVld	Incoming	boolean	[1]	inherit	Emergency Deceleration Request Valid
3	VehLgtSpd	Incoming	single	[1]	km/h	Vehicle Longitudinal Speed
4	VehLgtSpdVld	Incoming	boolean	[1]	inherit	Vehicle Longitudinal Speed Valid
5	GsctlGsSts	Incoming	Enum: CmnenaGearSt	[1]	inherit	Gsctl Gs Status
6	GsctlGsStsVld	Incoming	boolean	[1]	inherit	Gsctl Gs Status Valid
7	EmcdclEmrgDeceCmd	Outgoing	boolean	[1]	inherit	Emcdcl Emergency Deceleration Command
8	EmcdclEmrgDeceCmdVld	Outgoing	boolean	[1]	inherit	Emcdcl Emergency Deceleration Command Valid

2.5.4. Parameters

	Id	Data Type	Dimensions	Range	Unit	Description	Keywords
1	EmcdclAcvnTiout	single	[1,1]	Min: 0, Max: 5	sec	Emergency deceleration activation timeout	Emcdcl Activation Timeout
2	EmcdclAllwd	boolean	[1,1]	Min: 0, Max: 1		Paramenter for turning on\off the feature	Emcdcl Allowed
3	EmcdclCoolDwnTiout	single	[1,1]	Min: 0, Max: 20	sec	Emergency deceleration cooldown timeout	Emcdcl Cool Down Timeout
4	EmcdclSwtOnSpdThd	single	[1,1]	Min: 0, Max: 20	km/h	Emergency deceleration switch on speed threshold	Emcdcl Switch On Speed Threshold

2.5.5. Configuration Guide

The EmrgDeceCtl should be configured from the desired specification on EmrgDeceReq behavior.

2.5.5.1. Step 1 - Enable EmrgDece

Set EmcdclAllwd to True to enable debounce algorithm for EmrgDece request. (works as Enable switch for component)

2.5.5.2. Step 2 - Configure EmrgDece Request Conditions

The EmrgDeceCtl allows commanding emergency deceleration at VehSpd (in module) above EmcdclSwtOnSpdThd threshold. Hence, EmcdclSwtOnSpdThd must be a positive number.
Configure EmcdclSwtOnSpdThd as a minimum vehicle speed above which EmrgDece can be applied.

2.5.5.3. Step 3 - Configure EmrgDece Request Timeouts

The EmrgDeceCtl provides separate timeouts for debounce algorithm:

• latching EmrgDece command (EmcdclAcvnTiout) and
  

• unlatching EmrgDece command (EmcdclCoolDwnTiout)