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1. 发明专利

JPH04248454A HEATER CONTROL DEVICE OF OXYGEN CONCENTRATION DETECTION SENSOR 失效
公开(公告)号：JPH04248454A
公开(公告)日：1992-09-03
申请号：JP1356491
申请日：1991-02-04
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , YAMAMOTO YOSHIAKI , KURITA NORIAKI
IPC分类号： G01N27/12 , G01N27/14 , G01N27/409 , G01N27/419
摘要： PURPOSE:To prevent generation of an extreme scattering of sensor temperature when contents stored in a memory keeping a learned value of a target resistance is damaged in a heater control device which varies and controls a heater supply power so that a resistance of the heater which is installed at an oxygen concentration detection sensor becomes a target resistance. CONSTITUTION:In a heater control device which learns and updates a target resistance within a memory 15 by a learning means 16 according to a value of a heater supply power by a heater control means 14 at the time of a specified operation state, a detection means 17 is used to check to see whether contents in the memory 15 are damaged or not. When they are damaged, the heater supply power is fixed until a learning value reaches a specified value by a power fixing means 18 and then a control means 20 is used to shift to a fixed resistance control with an annealing treatment value of a specified number of learning values from a calculation means 19 as an initial value.

2. 发明专利

JPH03130550A HEATER CONTROL DEVICE FOR ON-VEHICLE OXYGEN SENSOR 失效
公开(公告)号：JPH03130550A
公开(公告)日：1991-06-04
申请号：JP19435989
申请日：1989-07-28
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , KANBARA TATSUYOSHI , SUEMATSU TOSHIO , KURITA NORIAKI
IPC分类号： G01N27/12 , F02D41/14 , F02D45/00 , G01N27/04
摘要： PURPOSE:To always obtain accurate detecting performance by calculating a correction value of combined resistance value in an electric heater, necessary for maintaining an electric resistance value to a fixed value of an oxygen sensor element, in accordance with an operating condition of a vehicle thus with a target resistance value corrected. CONSTITUTION:In an electric heater 23 for heating an element of an oxygen sensor 16 provided to appear in an exhaust manifold 15, so that a combined resistance value, including an electric resistance value of the electric heater, obtains a predetermined target value, supply power of the heater is controlled by a means A. In the above device, an operating condition of a vehicle is detected by a means B. While in accordance with the operating condition of the vehicle, a correction value of the combined resistance value, necessary for maintaining the electric resistance value to a fixed value in the element of the oxygen sensor 16, is calculated by a means C. By the calculated correction value, the target resistance value is corrected by a means D. Thus by fixedly maintaining a temperature in the element of the oxygen sensor 16, oxygen concentration in exhaust gas is always accurately detected.

3. 发明专利

JPH03148057A HEATER CONTROLLING APPARATUS FOR OXYGEN CONCENTRATION SENSOR 失效
公开(公告)号：JPH03148057A
公开(公告)日：1991-06-24
申请号：JP28743989
申请日：1989-11-06
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , FURUHASHI MICHIO , KURITA NORIAKI
IPC分类号： G01N27/12 , F02D41/14 , F02D45/00
摘要： PURPOSE:To maintain an air fuel ratio at an objective air fuel ratio even if the air fuel ratio is controlled by providing an auxiliary oxygen-concentration sensor whose electric resistance value is not subjected to the effect of temperature in comparison with a main oxygen-concentration sensor in the exhaust path of an engine. CONSTITUTION:A main oxygen-concentration sensor 16 has an oxygen-concentration sensor element 25 comprising an N-type semiconductor and an electric heater 26 which is arranged at the neighborhood of the element 25 and heats the element 25. The output voltage of the element 25 is inputted into an input port 35 through an AD converter 41. The amount of fuel injection through a fuel injection valve is controlled so that an air fuel ratio becomes an objective air fuel ratio based on the output signal of the element 25. Meanwhile, an auxiliary oxygen-concentration sensor 19 comprises zirconia, and a heater is not provided. The output voltage of the sensor 19 is inputted into the port 35 through an AD converter 42. When the air fuel ratio is on the lean side, the objective synthetic resistance value is decreased based on the output signal of the sensor 19, and the temperature of the sensor 16 is decreased. The air fuel ratio is corrected in the rich direction. Meanwhile, when the air fuel ratio is on the rich side, the air fuel ratio is corrected to the lean direction.

4. 发明专利

JPH0353151A HEATER CONTROLLER FOR OXYGEN SENSOR 失效
公开(公告)号：JPH0353151A
公开(公告)日：1991-03-07
申请号：JP18765789
申请日：1989-07-20
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , SUEMATSU TOSHIO , KANBARA TATSUYOSHI , KURITA NORIAKI
IPC分类号： G01N27/409 , G01N27/12
摘要： PURPOSE:To prevent the temperature of a sensor element from overshooting after starting energizing an electric heater and to make it possible to keep the temperature of the sensor element at a specified temperature as fast as possible by providing a target resistance value setting means, a temperature detecting means and an initial target resistance value deciding means. CONSTITUTION:A heater controller is provided with the electric heater A for adjusting the temperature of the sensor element and the electric resistance value of the heater A is detected by a supply power control means B, then power supplied to the heater A is controlled so that the detected resistance value may be a specified target resistance value. Then, the target resistance value setting means C sets the target resistance value as an initial target resistance value which is smaller than in an ordinary time in a specified period after starting energizing the heater A. The temperature detecting means D detects the temperature of the sensor element or the temperature which is representative thereof and the initial target resistance value deciding means E decides the initial target resistance value in accordance with the temperature detected by the temperature detecting means D.

5. 发明专利

JPH0342564A HEATER CONTROLLER FOR OXYGEN SENSOR TO BE MOUNTED ON VEHICLE 失效
公开(公告)号：JPH0342564A
公开(公告)日：1991-02-22
申请号：JP17847089
申请日：1989-07-11
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , KANBARA TATSUYOSHI , SUEMATSU TOSHIO , KURITA NORIAKI
IPC分类号： G01N27/409 , G01N27/04 , G01N27/12
摘要： PURPOSE:To maintain the temp. of a sensor element at a specified value even if a change arises in the parasitic resistance value of an electric heater according to the operating condition of a vehicle by providing a supply electric power control means, operating condition detecting means and electric power decrease suppressing means. CONSTITUTION:The controller has an electric heater A for regulating the element temp. The electric resistance value of this heater A is detected and the supply electric power to the heater A is so controlled by the supply electric power control means B that this value attains the prescribed target resistance value. Further, the vehicle operating condition detecting means C which detects the operating condition of the vehicle and the electric power decrease suppressing means D which suppresses the decrease of the electric power to be supplied to the heater A over a prescribed period after the high load operation according to the operating condition of the vehicle detected by the detecting means C are provided. The decrease of the electric power to be supplied to the heater A is suppressed over the prescribed period of time in this way after the high load operation and, therefore, the parasitic resistance value of the electric heater is increased and the temp. in the heat generating part of the heater A is maintained at the prescribed value, by which the temp. of the sensor element is maintained at the specified value.

6. 发明专利

JPH03189350A HEATER CONTROL UNIT FOR OXYGEN SENSOR 失效
公开(公告)号：JPH03189350A
公开(公告)日：1991-08-19
申请号：JP32924789
申请日：1989-12-19
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： KANBARA TATSUYOSHI , SUGINO TADASHI , KURITA NORIAKI
IPC分类号： G01N27/409 , F02D41/22 , F02D45/00 , G01N27/12
摘要： PURPOSE:To enable it to cope with temperature abnormality in an oxygen sensor and anything unusual in an oxygen sensor output value due to desired resistance value abnormality by judging it to be something wrong in the desired resistance value when such a state that heater supplied power has come out of the specified range is continued as long as the specified period. CONSTITUTION:A control means M4 controls the supplied power of a heater M5 so as to make a heater resistance value of this heater M5 for temperature control of an oxygen sensor M1 come to the desired resistance value. A desired value renewal means M6 renews the desired resistance value so as to make the supplied power for the heater M5 at time of the specified driving state of an internal combustion engine M2 come to the specified standard power. A power supply judging means M7 judges whether the power supply for the heater M5 is within the specified range or not, while a desired resistance value abnormal judging means M8 judges something wrong in the desired resistance value when such a state that power supply to the heater M5 is out of the specified range is continued as long as the specified period. Consequently, it is judged as abnormality in the desired resistance value when the desired resistance value largely differs from the request value because of replacement of the oxygen sensor M1 or battery change or the like.

7. 发明专利

JPH0332926A CAR AIR-CONDITIONER CONTROL DEVICE 失效
公开(公告)号：JPH0332926A
公开(公告)日：1991-02-13
申请号：JP16942889
申请日：1989-06-30
申请人： NIPPON DENSO CO , TOYOTA MOTOR CORP
发明人： NAKANE HIROAKI , SUGINO TADASHI , SUEMATSU TOSHIO
IPC分类号： B60H1/32
摘要： PURPOSE:To enhance air-conditioning efficiency by deciding set values corresponding to engine revolutions based on the shift positions of a transmission driven by an engine, and cutting a car air-conditioner from the engine under the conditions where the engine revolutions are below the set values. CONSTITUTION:Torque of an engine 11 is transmitted to drive wheels not shown in the figure through an automatic transmission 12 to be used as the drive source of a vehicle. It is also transmitted to a compressor 15 through a belt 13 and a magnet clutch 14 to be used as the power source of an air-conditioner. The magnet clutch 14 is ON/OFF-controlled by a controller 16 based on operating conditions of the engine 11 and each detection signal from an air-conditioner switch 17. In this case, set values corresponding to the revolution of the engine 11 are decided based on shift positions of the automatic transmission 12. When the revolutions of the engine 11 are below the set values, the magnet clutch 14 is turned off to cut the air-conditioner.

8. 发明专利

JPH04248455A HEATER CONTROL DEVICE OF OXYGEN CONCENTRATION DETECTION SENSOR 失效
公开(公告)号：JPH04248455A
公开(公告)日：1992-09-03
申请号：JP1356591
申请日：1991-02-04
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , YAMAMOTO YOSHIAKI , MIZUTANI KOICHI , SUEMATSU TOSHIO , KURITA NORIAKI
IPC分类号： G01N27/12 , G01N27/14 , G01N27/409 , G01N27/419
摘要： PURPOSE:To prevent generation of an extreme scattering of sensor temperature when contents stored in a memory keeping a learned value of a target resistance is damaged in a heater control device which varies and controls a heater supply power so that a resistance of the heater which is installed at an oxygen concentration detection sensor becomes a target resistance. CONSTITUTION:When it is detected that contents stored in a memory 15 are damaged by a detection means 17, a heater control means 14 is controlled so that a heater supply power is constant by a power fixing means 18. A calculation means 19 calculates an annealing value of a heater resistance while this heater supply power is maintained to be constant. A control means 20 allows the heater control means 14 to be continued to a heater fixed resistance control and at the same time a value based on the annealing treatment value to be used as an initial value of the target resistance at that time.

9. 发明专利

JPH04109156A ABNORMALITY DETECTING DEVICE FOR OXYGEN CONCENTRATION DETECTING SENSOR 失效
公开(公告)号：JPH04109156A
公开(公告)日：1992-04-10
申请号：JP22689890
申请日：1990-08-29
申请人： TOYOTA MOTOR CORP , NIPPON DENSO CO
发明人： SUGINO TADASHI , YAMAMOTO YOSHIAKI , KURITA NORIAKI
IPC分类号： G01N27/12 , G01N27/26 , G01N27/416
摘要： PURPOSE:To correctly detect an abnormality by controlling the heater feed power so that the heater resistance value of an oxygen sensor with a heater is intentionally set to a value other than the target resistance value. CONSTITUTION:An oxygen concentration detecting sensor 14 has a heater 13 for heating a solid electrolyte and an electrode constituting the sensor 14 so that it can be effectively operated when the temperature in exhaust gas is relatively low and the element temperature is kept stable. Controlling the electric resistance constant in this sensor 14 is equivalent to keeping the temperature of the metal constant, thus the heater feed power from a power feeding means 16 is controlled by a heater control means 15 so as to set the heater resistance value to the target resistance value. The feed power to the heater 13 is intentionally set to the preset value to obtain the resistance value other than the target resistance value, if the value of the output detection signal of the sensor 14 at that time is biased, a judging means 17 judges the sensor 14 as abnormal.

10. 发明专利

JPH03229142A HEATER CONTROLLER OF OXYGEN CONCENTRATION SENSOR 失效
公开(公告)号：JPH03229142A
公开(公告)日：1991-10-11
申请号：JP2482390
申请日：1990-02-02
申请人： NIPPON DENSO CO , TOYOTA MOTOR CORP
发明人： TOUWAKI CHIHIRO , MURAKAMI KENJI , SUGINO TADASHI
IPC分类号： G01N27/409 , G01N27/04 , G01N27/12
摘要： PURPOSE:To adequately control the energization of a heater while monitoring the energizing current of the heater by making effective utilization of the resistance/temp. characteristics of the heater of the oxygen concn. sensor used for controlling the air-fuel ratio of an engine, etc. CONSTITUTION:The heater 13 of the oxygen concn. sensor is connected at one end to the positive side terminal of a battery B via the ignition switch IG of a vehicle and is connected at the other end to the collector of a transistor (TR) 20. The heater 13 is imparted with the direct current from the battery B only under the conduction of the TR 20 while the switch IG is held closed, thereby heating a titania element. A detecting resistor 30 receives the energizing current of the heater 13 and outputs the same as a terminal voltage. A micro computer 60 takes this voltage therein and intermittently supplies the energizing current at every prescribed time regardless of the active state of the oxygen concn. sensor when the energizing current is larger than a prescribed current value. The microcomputer controls the supply of the energizing current in such a manner that the oxygen concn. sensor maintains the active state when the energizing current is smaller than the prescribed current value.

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