Cooling system for a supercharged internal-combustion engine

A cooling system using coolant for a supercharged internal-combustion engine, comprising:

• a high-temperature circulating system having a main and secondary branch, said main branch including the internal-combustion engine and a high-temperature recooler, said secondary branch including a high-temperature charge-air cooler for cooling charge air wherein the coolant required for the secondary branch, is taken from the main branch and, after flowing through the high temperature charge air cooler, is admixed to a coolant flowing away from the high-temperature recooler, leading to a coolant inlet of the internal-combustion inlet;
• a low-temperature circulating system comprising a low-temperature recooler and a low-temperature charge air cooler coupled in series with the low-temperature recooler, said charge-air flowing through the low-temperature charge air cooler from the high temperature charge-air cooler for a further cooling before being fed to cylinders of the internal-combustion engine;
• coolant pumps for circulating the coolant;
• wherein the coolant required in the secondary branch is branched off a coolant flow, in which the total quantity of the coolant leaving the high-temperature recooler and the coolant flowing out of the secondary branch from the high-temperature charge air cooler are mixed and further wherein the coolant flowing through the internal-combustion engine then flows to the high-temperature recooler;
• and
• additional heat exchangers connected downstream of the low temperature charge-air cooler, wherein the coolant circulating in the low-temperature circulating system, after leaving the low-temperature charge air cooler and the additional heat exchangers, is mixed with the coolant from the high-temperature circulating system leaving the high-temperature recooler and the high-temperature charge air cooler, and wherein the coolants guided to the low-temperature recooler and to the high-temperature charge air cooler are taken from this mixed flow.