1899   FuelStop in DFCL

Created: 10 Dec 2023

Status: Drafting Implementation

Part: Part 7-420 (2021; Edition 2, DER)

Links:

Page: 290

Clause: A.3.1.13.3

Paragraph: Table A.50

Issue

The explanation of DO does not correspond to the semantics of DO name.
- DO name is FuelStop.
- The explanation is "True = open; False = close fuel valve driver command".

Proposal

The DO name should be changed to "FuelSupStr" or the values assigned to open and close should be reversed.

Discussion Created Status
14-Nov-2025. Change DFCL FuelStop to FuelCtl
Description
Fuel system start/stop command. True means start = open the fuel valve. False means stop = close the fuel valve. 		14 Nov 25 Drafting Implementation
Accepted for discussion 04 Nov 25 Discussion (red)
Discussed briefly in WG17 meeting 4th March 2025 04 Nov 25 Accepted
KFLV Add note: If both FuelStr and FuelStop values are true, then the FuelStop command takes precedence. 04 Mar 25 Triage
better description

DFCL FuelStrStop Fuel system start/stop command. True means start fuel flow. False means stop fuel flow. 		04 Mar 25 Triage
The FuelStop DO is also used in KVLV but has a different description

(DFCL) True = open; False = close fuel valve driver command
(KFLV) Fuel shutoff valve driver command

DFCL is Fuel Cell Controller
KFLV is Fuel delivery system

KFLV also has
FuelStr SPC (KFLV) Fuel start
FuelSt SPS (KFLV) Fuel system status – True: on

Suggest change DO name and description in DFCL
DFCL FuelStrStop Fuel system start/stop command. True means start. False means stop.

Suggest change descriptions in KFLV

KFLV FuelStop Fuel system shutoff command: True means fuel control valve should close. False state is ignored.
KFLV FuelStr Fuel system start command: True means fuel control valve should open. False state is ignored
13 Feb 25 Triage

 

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