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3. 发明专利

JPH0684938B2 失效
公开(公告)号：JPH0684938B2
公开(公告)日：1994-10-26
申请号：JP23121085
申请日：1985-10-18
申请人： HITACHI LTD
发明人： KUROIWA HIROSHI , OOYAMA TAKASHIGE
IPC分类号： G01N21/71 , F02D41/14 , F02D45/00 , F02P13/00 , F02P17/12 , G01J1/42 , G01M15/04 , G01M15/00

9. 发明专利

JPS6367561A AIR-FUEL RATIO SENSOR 失效
公开(公告)号：JPS6367561A
公开(公告)日：1988-03-26
申请号：JP21164286
申请日：1986-09-10
申请人： HITACHI LTD
发明人： OSUGA MINORU , OOYAMA TAKASHIGE
IPC分类号： G01N27/41 , F02D41/14 , G01N27/406 , G01N27/416
摘要： PURPOSE:To oxidize and remove dirty particles which stick on a diffusion resistance body by providing which is composed of an oxygen ion conductive solid-state electrolyte and the diffusion resistance body and supplies oxygen to the diffusion resistance body in a specific period during operation. CONSTITUTION:When an air fuel ratio is measured, D1 is turned on and D2 is turned off with a signal from a microcomputer 7 to turn on a switch S1 and also turn off a switch S2. The voltage V of the power source 8 is applied to the solid-state electrolyte 2 and a current I flows as shown by a solid-line arrow, so that an output Vout is led out through a buffer amplifier 9. When oxygen is supplied to the diffusion resistance body 3 for a constant period during operation, the microcomputer 7 turns on the D1 and turns off the D2 to turn off and on the switches S1 and S2 respectively, thereby inverting the application polarity of the voltage V. A current I' flows as shown by a dotted- line direction and the oxygen is moved to the side of the diffusion resistance body 3 to oxidize and remove dirty particles 6.

10. 发明专利

JPS6350640A AIR-FUEL RATIO CONTROL SYSTEM 失效
公开(公告)号：JPS6350640A
公开(公告)日：1988-03-03
申请号：JP19269386
申请日：1986-08-20
申请人： HITACHI LTD
发明人： OSUGA MINORU , OOYAMA TAKASHIGE
IPC分类号： F02D41/14 , F02D41/00
摘要： PURPOSE:To keep off the worsening of controllability based on the deterioration of an air-fuel ratio sensor, by varying a control constant in an air-fuel ratio feedback control system when the air-fuel ratio sensor detects a secular change. CONSTITUTION:Each detected value of a throttle opening sensor 4, a water temperature sensor 6, an air-fuel ratio sensor 7, a crank angle sensor and so on is inputted into a control circuit 10. And, a fuel quantity equivalent to a suction air quantity to be found out of throttle opening is fed and simultaneously the water temperature compensation based on the detected value of the water temperature sensor 6 and the feedback compensation based on the detected value of the air-fuel ratio sensor 7 both are carried out. The control circuit 10 sets response time of the air-fuel ratio sensor 7 in corresponding to a limiting current value to oxygen content of the air-fuel ratio sensor 7, and corresponding to this response time, varies a proportional constant in a feedback control system, making control width into the same.

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