Hochinteressant! Das liegt an einer etwas komplizierten Standarddefinition von \DeclareFieldFormat{extrayear}. Wir brauchen nur
Im Ganzen (ich habe einen Fehler - \iffieldundef{urlyear} - behoben und ein paar fehlende % ergänzt.)
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{csquotes}
\usepackage{filecontents}
\usepackage[backend=biber,citestyle=authoryear,bibstyle=authortitle, sorting=cnyt,dashed=false,%
maxcitenames=2,maxbibnames=99,uniquelist=false, uniquename=false, natbib=true, urldate=comp,isbn=false,doi=false,bibencoding=utf8,dateabbrev=false]{biblatex}
\begin{filecontents}{\jobname.bib}
@misc{A01,
author = {Schmidt, A. and Schneider, B.},
year = {2001},
title = {Alpha},
}
@misc{A02,
author = {Meier, A. and Mueller, B. and J, Kurt},
year = {2001},
title = {Alpha},
}
@misc{A03,
author = {Lens,Markus},
year = {2001},
title = {Alpha},
}
@misc{A04,
author = {Lens,Markus},
year = {2001},
title = {Alpha2},
}
@online{A06,
author = {ABB,Ltd},
title = {YuMi: Zusammen in die Zukunft der Automatisierung},
urldate = {2017-06-24},
url = {https://library.e.abb.com/public/b1185932b22144a2996a200c5e4db75b/Datenblat%20YuMi_lowres.pdf}
}
@online{A05,
author = {ABB,Ltd},
title = {Roboterbasiertes Kleben mit integriertem Applikationssystem},
urldate = {2017-04-05},
url = {https://library.e.abb.com/public/6ad9965ec28d9cfdc125775900470106/Datenblatt_Kleben_highres.pdf}
}
\end{filecontents}
\renewcommand*{\mkbibnamefamily}[1]{\textsc{#1}}
\AtEveryCite{\renewcommand*{\mkbibnamefamily}[1]{#1}}
\DeclareNameAlias{sortname}{family-given}
\setlength{\bibhang}{0pt}% wirklich nur wenns denn sein muss
\setlength{\bibitemsep}{5pt}
\DeclareFieldFormat[thesis]{title}{\textit{#1\isdot}}
\DeclareFieldFormat[inbook]{title}{\textit{#1\isdot}}
\DeclareFieldFormat[article]{title}{\textit{#1\isdot}}
\DeclareFieldFormat[incollection]{title}{\textit{#1\isdot}}
\DeclareFieldFormat[inproceedings]{title}{\textit{#1\isdot}}
\DeclareFieldFormat[thesis]{title}{\textit{#1\isdot}}
\AtBeginBibliography{%
\renewcommand*{\multinamedelim}{\addsemicolon\space}%
\renewcommand*{\finalnamedelim}{\multinamedelim}}
% Siehe http://tex.stackexchange.com/q/11827/35864, plus ein paar Modifikationen
\newcounter{mymaxcitenames}
\AtBeginDocument{%
\setcounter{mymaxcitenames}{\value{maxnames}}%
\renewcommand*{\nameyeardelim}{\space}
}
\DeclareFieldFormat{extrayear}{\mknumalph{#1}}
\makeatletter
\renewbibmacro*{begentry}{%
\printtext[brackets]{\printtext[bold]{%
\begingroup
\renewcommand*{\multinamedelim}{\addcomma\space}%
\renewcommand*{\finalnamedelim}{%
\ifnumgreater{\value{liststop}}{2}{\finalandcomma}{}%
\addspace\bibstring{and}\space}%
\csuse{blx@hook@cite}%
\csuse{blx@hook@citekey}%
\citetrackerfalse\pagetrackerfalse\backtrackerfalse
\defcounter{maxnames}{\value{mymaxcitenames}}%
\usebibmacro{cite}%
\endgroup
}}%
\newline
}
\makeatother
\DefineBibliographyStrings{ngerman}{%
andothers = {et\addabbrvspace al\adddot},
urlseen = {Zugriff am},
urlfrom = {verfügbar unter},
phdthesis = {Dissertation},
mathesis = {Masterarbeit},
}
\renewbibmacro*{issue+date}{%
\setunit{\addcomma\space}%
\printfield{issue}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\DeclareFieldFormat{urldate}{\mkbibbrackets{\bibstring{urlseen}\addcolon\space#1}}
\renewbibmacro*{date}{%
\printdate
\setunit{\addspace}%
\usebibmacro{urldate}}
\DeclareFieldFormat{url}{\bibstring{urlfrom}\addcolon\space\url{#1}}
\renewbibmacro*{url+urldate}{%
\usebibmacro{url}}
\DeclareSourcemap{
\maps[datatype=bibtex]{
\map[overwrite=true]{
\pertype{standard}
\step[fieldsource=institution, match=\regexp{\ADIN\Z}, final]
\step[fieldset=shorthand, origfieldval]
\step[fieldsource=number, final]
\step[fieldset=shorthand, origfieldval, append]
\step[fieldset=shorthand, fieldvalue={:}, append]
\step[fieldsource=date, match=\regexp{\A[0-9]{2}([0-9]{2})}]
\step[fieldset=shorthand, fieldvalue={$1}, append]
\step[fieldsource=shorthand]
\step[fieldset=sortkey, origfieldval]
}
\map[overwrite=true]{
\pertype{standard}
\step[fieldsource=institution, match=\regexp{\AVDI\Z}, final]
\step[fieldset=shorthand, origfieldval]
\step[fieldset=shorthand, fieldvalue={~}, append]
\step[fieldsource=number, final]
\step[fieldset=shorthand, origfieldval, append]
\step[fieldsource=shorthand]
\step[fieldset=sortkey, origfieldval]
}
}
}
\DeclareBibliographyDriver{standard}{%
\usebibmacro{bibindex}%
\usebibmacro{begentry}%
\printfield{type}%
\setunit{\addcomma\space}\newblock
\printlist{institution}%
\setunit{\addspace}%
\printfield{number}%
\setunit{\addspace}\newblock
\printfield{month}%
\setunit{\addspace}%
\printfield{year}%
\newunit\newblock
\usebibmacro{title}%
\usebibmacro{finentry}}
%Doppelpunkt hinter den Namen
\renewcommand*{\labelnamepunct}{\addcolon\addspace}
\DeclareSortingScheme{cnyt}{
\sort{
\field{presort}
}
\sort[final]{
\field{sortkey}
\field{shorthand}
}
\sort{
\field{sortname}
\field{author}
\field{editor}
\field{translator}
\field{sorttitle}
\field{title}
}
\sort{
\field{sortyear}
\field{year}
}
\sort{
\field{sorttitle}
\field{title}
}
\sort{
\field{volume}
\literal{0}
}
}
\addbibresource{\jobname.bib}
\begin{document}
\citep{A03,A04,A05,A06}
\cite{A03,A04,A05,A06}
\printbibliography[title=Literaturverzeichnis]
\end{document}