In a furious attempt to keep interest rates down while simultaneously acknowledging signs of economic growth, the Bank of Japan said Friday it will increase the maximum amount of money it means to pump into banks.

The central bank rephrased its target balance of banks' current accounts held at the BOJ to "around 27 trillion yen to 32 trillion yen" from "around 27 trillion yen to 30 trillion yen." The actual amount is expected to be around 30 trillion yen, the BOJ said.

An improved economic outlook and optimistic gross domestic product projections have financial markets asking if and when interest rates will start to rise. Central bankers are struggling to quell those expectations.