Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1996-10-25
1998-11-17
Neil, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4100, F02M 2300, F02M 2500
Patent
active
058362924
ABSTRACT:
This invention provides a heater controller applied to an air-fuel ratio sensor to prevent the sensor being cooled after a return from a fuel-cut state.
The temperature of a detecting element 111 of an air-fuel ratio sensor 11 is maintained at a fixed temperature by beating the heater 112, and an electric power supplied to the heater is controlled by controlling a switching element 122 of a driving circuit 12 to a proper duty ratio. The sensor is cooled during the fuel-cut state because intake air is directly exhausted to an exhaust pipe, and the temperature of the sensor does not return to the proper temperature after a return from the fuel-cut state because the ambient temperature does not immediately return to the temperature before the fuel-cut state. Therefore a heater controller prevents the sensor being cooled by increasing an electric power after the return from the fuel-cut state in accordance with an integrated intake air-flow rate during the fuel-cut state.
REFERENCES:
patent: 4694809 (1987-09-01), Nakano et al.
patent: 4938196 (1990-07-01), Hoshi et al.
patent: 5111792 (1992-05-01), Nagai et al.
patent: 5148795 (1992-09-01), Nagai et al.
patent: 5353775 (1994-10-01), Yamashita et al.
Neil Raymond A.
Toyota Jidosha & Kabushiki Kaisha
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