Hitachi Astemo
Cooling channel pistons use a special casting method to create an annular cavity that allows engine oil to pass, thereby preventing excessive temperature rise of the piston during engine operation and increasing combustion efficiency.
Realization of low friction by variable control of engine oil pressure corresponding to VTC, oil jet and crank lubrication
Optimal oil pressure (flow rate) supply to oil jet in engine conditions where piston cooling is required
Optimal oil pressure control by C-VDVP, oil pressure sensor, ECU
Piston cooling: anti-knock improvement
Low friction: fuel economy improvement
