Patent ID: 7721683

Claim:
A cooling system for an internal combustion engine with coolant flowing in a coolant circuit ( 4 ), the engine having a cylinder head ( 2 ) and an associated cylinder block ( 3 ) with a block cooling jacket ( 12 ), the cooling system comprising: a pump ( 21 ) disposed in the coolant circuit ( 4 ) upstream of the internal combustion engine; an exhaust cooling jacket ( 13 ) disposed in the cylinder head ( 2 ); an intake cooling jacket ( 16 ) disposed in the cylinder head ( 2 ) wherein said exhaust and intake cooling jackets are separated; a heater disposed in the coolant circuit ( 4 ) upstream of said pump ( 21 ); a first valve ( 6 ) disposed in the coolant circuit ( 4 ) located between said exhaust cooling jacket ( 13 ) and said heater ( 17 ) wherein coolant flows from said exhaust cooling jacket ( 13 ) to said heater when said first valve ( 6 ) is open and is substantially stopped from flowing when said first valve ( 6 ) is closed; a second valve ( 7 ) disposed in the coolant circuit ( 4 ) connected to receive coolant from said first valve ( 6 ) and from said intake cooling jacket ( 16 ) wherein when said second valve ( 7 ) is closed, flow from said intake cooling jacket ( 16 ) is substantially stopped; a third valve ( 8 ) disposed in the coolant circuit ( 4 ) connected to receive coolant from said second valve ( 7 ) and from the block cooling jacket ( 12 ) wherein when said third valve ( 8 ) is closed, flow from the block cooling jacket ( 12 ) is substantially stopped.