Title:
【発明の名称】空燃比検出装置
Document Type and Number:
Japanese Patent JP2513350
Kind Code:
B2
Abstract:
PURPOSE:To improve stoichiometric detection accuracy and response and to perform fine adjustment of a target air-fuel ratio readily by directly or indirectly detecting the intrinsic oxygen-concentration electromotive force of a pump cell, and obtaining a stoiciometric judging signal. CONSTITUTION:A comparing circuit 1 and an integration amplifier 2 having positive and negative power supplies constitute a control means 31. Electromotive force Vs across electrodes 26 and 27 of a sensor cell 20 is compared with a reference voltage Vref. The outputs are integrated in the integration amplifier 2, and the positive or negative control output is applied across electrodes 28 and 29 of a pump cell 21. A pump current Ip is made to flow through the cell 21. The current Ip is detected with a circuit 3 based on the voltage drop generated in a resistor 5. The current Ip is converted into an air-fuel ratio signal Vout with an adding circuit 4. Then, the voltage at a point A of the cell 21, i.e. a pump voltage Vp across the electrodes 28 and 29, is inputted into a pump- voltage measuring and processing circuit 7. The circuit 7 outputs a theoretical air-fuel-ratio (stoichiometric) signal Vstc at which the different levels are obtained on the lean side and the rich side with the stoichiometric point as a boundary.
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Inventors:
ISHIDA TETSURO
MURAKAMI NOBUAKI
DANNO YOSHIRO
MURAKAMI NOBUAKI
DANNO YOSHIRO
Application Number:
JP20432790A
Publication Date:
July 03, 1996
Filing Date:
July 31, 1990
Export Citation:
Assignee:
MITSUBISHI MOTORS CORP
International Classes:
G01N27/419; G01N27/406; G01N27/416; G01N27/417; (IPC1-7): G01N27/419
Domestic Patent References:
| JP6381258A | ||||
| JP60230537A |
Attorney, Agent or Firm:
Kabayama Toru