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An energy conversion system using the static head pressure of large bodies of water to compress a gas. A Pascal hydraulic link between a small piston and a large piston multiplies the force of the large piston compressing the gas. Heat transfer is established between the gas compressed by the large

An energy conversion system using the static head pressure of large bodies of water to compress a gas. A Pascal hydraulic link between a small piston and a large piston multiplies the force of the large piston compressing the gas. Heat transfer is established between the gas compressed by the large piston and a fluid used to drive a turbine. After time, the static head pressure on the small piston is relieved allowing the compressed gas to expand ending a cycle. Electrical energy is produced by a generator driven by the turbine using thermal energy generated by repeated compressions of the gas.

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An energy conversion system using the static head pressure of large bodies of water to compress a gas. A Pascal hydraulic link between a small piston and a large piston multiplies the force of the large piston compressing the gas. Heat transfer is established between the gas compressed by the large

An energy conversion system using the static head pressure of large bodies of water to compress a gas. A Pascal hydraulic link between a small piston and a large piston multiplies the force of the large piston compressing the gas. Heat transfer is established between the gas compressed by the large piston and a fluid used to drive a turbine. After time, the static head pressure on the small piston is relieved allowing the compressed gas to expand ending a cycle. Electrical energy is produced by a generator driven by the turbine using thermal energy generated by repeated compressions of the gas. ion of the difference between the time at which the purge flow rate is computed and the time at which purge gas having the computed flow rate is drawn into the combustion chamber, the computer corrects the computed vapor concentration by using the concentration correction value; and wherein the computer sets the fuel supply amount in accordance with the computed purge flow rate and the corrected vapor concentration. 2. The apparatus according to claim 1, wherein the computer computes a delay time, which reflects the time difference, in accordance with the speed of the engine.3. The apparatus according to claim 2, wherein the computed delay time decreases as the engine speed increases.4. The apparatus according to claim 2, wherein the computer stores a plurality of time-sequential values of the concentration correction value, and wherein the computer selects one of the stored time-sequential concentration correction values that corresponds to the computed delay time and uses the selected concentration correction value for correcting the computed vapor concentration.5. The apparatus according to claim 4, wherein the computer selects an older one of the concentration correction values for a greater value of the computed delay time.6. The apparatus according to claim 2, wherein the computer stores a plurality of time-sequential values of the computed purge flow rate, and wherein the computer selects one of the stored time-sequential purge flow rates that corresponds to the computed delay time as an actual purge flow rate and uses the actual purge flow rate for setting the fuel supply amount.7. The apparatus according to claim 6, wherein the computer selects an older one of the computed purge flow rates for a greater value of the computed delay time.8. The apparatus according to claim 1, wherein, the computer sets the concentration correction value such that the correction amount of the computed vapor concentration, which is obtained by using the concentration correction value, gradually approaches zero as time elapses after the computed purge flow rate is changed.9. The apparatus according to claim 8, wherein the computer sets the concentration correction value such that the degree of change of the correction amount of the computed vapor concentration, which is obtained by using the concentration correction value, changes according to the computed purge flow rate.10. The apparatus according to claim 1, wherein the computer computes a feedback correction value based on the difference between the detected air-fuel ratio and the target air-fuel ratio, wherein the feedback correction value is used for feedback correcting the fuel supply amount, and wherein the computer computes the vapor concentration according to the feedback correction value.11. An apparatus for controlling the air-fuel ratio of air-fuel mixture drawn into a combustion chamber of an engine, wherein an intake passage of the engine is connected to a canister by a purge line, wherein the canister adsorbs fuel vapor generated in the fuel tank and permits the adsorbed fuel vapor to be separated, wherein gas containing fuel vapor is purged as purge gas from the canister to the intake passage through the purge line, the apparatus comprising: a purge control valve for adjusting purge flow rate, which is the flow rate of the purge gas flowing through the purge line; a sensor for detecting the air-fuel ratio of the air-fuel mixture; a computer for setting the amount of fuel supplied to the combustion chamber such that the detected air-fuel seeks a target air-fuel ratio; wherein the computer computes the purge flow rate based on the opening degree of the purge control valve, and computes vapor concentration, which is the concentration of the fuel vapor contained in the purge gas, based on the difference between the detected air-fuel ratio and the target air-fuel ratio; wherein, in accordance with the rate of change of the computed purge flow rate, the compute