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廣(guang)告宣傳(chuan)車載發電機負荷變(bian)(bian)(bian)化(hua)時，轉(zhuan)(zhuan)(zhuan)動(dong)(dong)速(su)度(du)變(bian)(bian)(bian)化(hua)大。具(ju)體(ti)而(er)言是：廣(guang)告宣傳(chuan)車載發電機組負荷減低時，轉(zhuan)(zhuan)(zhuan)動(dong)(dong)速(su)度(du)上(shang)升，轉(zhuan)(zhuan)(zhuan)動(dong)(dong)速(su)度(du)上(shang)升導(dao)致(zhi)液壓(ya)柱塞泵循(xun)環系統供(gong)油(you)量提(ti)升，循(xun)環系統供(gong)油(you)量提(ti)升又導(dao)致(zhi)轉(zhuan)(zhuan)(zhuan)動(dong)(dong)速(su)度(du)更進(jin)一步上(shang)升，這(zhe)樣(yang)的不斷地惡循(xun)環，導(dao)致(zhi)廣(guang)告宣傳(chuan)車載發電機轉(zhuan)(zhuan)(zhuan)動(dong)(dong)速(su)度(du)變(bian)(bian)(bian)得越來越高(gao)。

相(xiang)反，當發電(dian)機組負(fu)荷(he)增(zeng)加時，轉(zhuan)(zhuan)動(dong)速(su)(su)度(du)(du)減低(di)，轉(zhuan)(zhuan)動(dong)速(su)(su)度(du)(du)減低(di)導致液壓柱塞泵循(xun)環(huan)系統(tong)(tong)供(gong)油(you)量減低(di)，循(xun)環(huan)系統(tong)(tong)供(gong)油(you)量提(ti)升又導致轉(zhuan)(zhuan)動(dong)速(su)(su)度(du)(du)更進(jin)一步減低(di)，導致發電(dian)機組轉(zhuan)(zhuan)動(dong)速(su)(su)度(du)(du)越來(lai)越低(di)，后(hou)熄火(huo)。要更改這樣的(de)惡循(xun)環(huan)，需求一類能依據負(fu)荷(he)變化自動(dong)調(diao)節供(gong)油(you)量。使(shi)(shi)發電(dian)機組在規定(ding)的(de)轉(zhuan)(zhuan)動(dong)速(su)(su)度(du)(du)范(fan)圍內穩定(ding)運(yun)轉(zhuan)(zhuan)的(de)自動(dong)控制機構(gou)。移動(dong)供(gong)油(you)拉(la)桿，可以更改循(xun)環(huan)系統(tong)(tong)供(gong)油(you)量，使(shi)(shi)發電(dian)機組機的(de)轉(zhuan)(zhuan)動(dong)速(su)(su)度(du)(du)基本不變。