Yuan Zhou Mingshan Liu Li-shuang Hu Zi-da Zhang Application of fuzzy five states control system base on phase plane in steer by wire system of loader. 649-653 2010 FSKD http://dx.doi.org/10.1109/FSKD.2010.5569427 conf/fskd/2010 db/conf/fskd/fskd2010.html#ZhouLHZ10