Pampu yoyezera imatchedwanso pampu yochuluka kapena pampu yofanana. Pampu yoyezera ndi pampu yapadera yosuntha yomwe imatha kukwaniritsa zofunikira za njira zosiyanasiyana zaukadaulo, ili ndi liwiro la kuyenda lomwe lingasinthidwe mosalekeza mkati mwa 0–100% ndipo imagwiritsidwa ntchito kunyamula zakumwa (makamaka zakumwa zowononga)
Pampu yoyezera ndi mtundu wa makina operekera madzi ndipo chinthu chake chabwino kwambiri ndichakuti imatha kusunga kuyenda kosalekeza mosasamala kanthu za kuthamanga kwa madzi. Ndi pampu yoyezera, ntchito zoperekera, kuyezera ndi kusintha zimatha kumalizidwa nthawi imodzi ndipo chifukwa chake, njira yopangira imatha kukhala yosavuta. Ndi mapampu angapo oyezera, mitundu ingapo ya zolumikizira imatha kulowetsedwa mu njira yaukadaulo molondola kenako nkusakanikirana.
