Coolant circuit and method for a multi-cylinder internal-combustion engine

Abstract

The invention relates to a coolant circuit as well as to a method of operating a coolant circuit for a multi-cylinder internal-combustion engine having a cooling jacket (16, 18, 20, 22) which surrounds a cylinder head housing (14) and a cylinder block and which is supplied with cooling liquid by way of a pump. It is suggested that the cylinder cooling jacket (16, 18) and the cylinder head cooling space (20, 22) be provided with a connection (36, 38) for feeding the cooling liquid and that the cooling liquid flow parallel through the cylinder head housing (14) and the cylinder block. Thus, a cooling of the cylinder block and the cylinder head which meets the requirements takes place without any additional control devices. The engine rapidly reaches its operating temperature, thereby reducing the cold running phase. As a result, the fuel consumption and the crude emissions can be reduced.

Dependencies are inferred from the claim text.