1992-10-01

Development of Honda Flexible Fuel Vehicle 922276

A Flexible Fuel Vehicle (FFV) has been developed to accommodate the use of both gasoline and M85 in the same engine. The methanol content of fuel is detected by a capacitor type alcohol sensor. The power and torque of the engine increase 8% if the M85 is used. One number colder spark plug is sufficient for the FFV engine to tolerate pre-ignition with M85. FFV engine oil shows improved wear characteristics under severe operating conditions. Chrome-plated piston rings should be used for methanol engines. Valve and valve seat wear, durability of fuel injectors have been considerably improved for methanol engines. The exhaust emissions from a FFV can be maintained at a low level. Further reduction of exhaust emissions is possible if the durability of fuel injectors is fully proven. Most aldehyde and methanol emissions are emitted before the catalysts light off. OMHCE emissions are lower and NMOG emissions (before the reactivity adjustment) are higher for a M85-fueled FFV. Heated spark plugs successfully start the engine at minus 25 degrees Celsius with M85. A larger evaporative canister, enlarged fuel, and vapor lines are installed in the FFV to lower fuel tank pressure. A pressure regulator which increases the fuel rail pressure at the start of the engine is utilized to improve hot-restarting capabilities of the FFV.

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