Temperature Control Apparatus for Heater-Equipped Sensor
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Accused Products
Abstract
When power begins to be supplied to a heater, open loop control is selected as the power supply control method to supply a predetermined power to the heater. After that, the control method is switched to feedback control to set the power to be supplied to the heater based on the difference between the target temperature and the actual temperature of the sensor chip if a predetermined period of time in which the difference between the target temperature and the actual temperature is expected to fall within a predetermined reference difference has passed since power began to be supplied to the heater.
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Citations
10 Claims
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1. (canceled)
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2. A temperature control apparatus for a heater-equipped sensor comprising a sensor chip which is activated by warm-up and a heater which is supplied with electric power to generate heat, wherein said control apparatus warms up the sensor chip to a predetermined target temperature equal to or higher than its activation temperature by making the heater heat the sensor chip, said control apparatus comprising:
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power supply control means for selecting open loop control as the power supply control method when power begins to be supplied to the heater and, after that, switching the control method to feedback control, wherein under the open loop control, a predetermined power is supplied to the heater while under the feedback control, the power to be supplied to the heater is set based on the difference between the target temperature and the actual temperature of the sensor chip; and switch judgment means for judging whether the switch timing from the open loop control to the feedback control has come; wherein the switch judgment means judges that the switch timing has come if a predetermined period of time in which the difference between the target temperature and the actual temperature is expected to fall within a predetermined reference difference has passed since power began to be supplied to the heater; and wherein the predetermined period of time is set so that the power to be supplied to the heater immediately after the open loop control is switched to the feedback control becomes equal to or lower than the power to be supplied under the open loop control.
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3. (canceled)
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4. A temperature control apparatus for a heater-equipped sensor comprising a sensor chip which is activated by warm-up and a heater which is supplied with electric power to generate heat, wherein said control apparatus warms up the sensor chip to a predetermined target temperature equal to or higher than its activation temperature by making the heater heat the sensor chip, said control apparatus comprising:
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power supply control means for selecting open loop control as a power supply control method when power begins to be supplied to the heater and, after that, switching the control method to feedback control, wherein under the open loop control, a predetermined power is supplied to the heater while under the feedback control, the power to be supplied to the heater is set based on the difference between the target temperature and the actual temperature of the sensor chip; and switch judgment means for judging whether the switch timing from the open loop control to the feedback control has come; wherein the switch judgment means judges that the switch timing has come if the difference between the target temperature and the actual temperature falls within a predetermined reference difference; and wherein said reference difference is set so that the power to be supplied to the heater immediately after the open loop control is switched to the feedback control becomes equal to or lower than the power to be supplied under the open loop control. - View Dependent Claims (5, 6)
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7. A temperature control apparatus for a heater-equipped sensor comprising a sensor chip which is activated by warm-up and a heater which is supplied with electric power to generate heat, wherein said control apparatus warms up the sensor chip to a predetermined target temperature equal to or higher than its activation temperature by making the heater heat the sensor chip, said control apparatus comprising:
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power supply control means for selecting open loop control as the power supply control method when power begins to be supplied to the heater and, after that, switching the control method to feedback control, wherein under the open loop control, a predetermined power is supplied to the heater while under the feedback control, the power to be supplied to the heater is set based on the difference between the target temperature and the actual temperature of the sensor chip; wherein for a short while after the open loop control is switched to the feedback control, the power supply control means uses a predetermined dampening factor to dampen the target power supply calculated by the feedback control and sets the result as the power to be supplied to the heater.
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8. (canceled)
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9. A temperature control apparatus for a heater-equipped sensor comprising a sensor chip which is activated by warm-up and a heater which is supplied with electric power to generate heat, wherein said control apparatus warms up the sensor chip to a predetermined target temperature equal to or higher than its activation temperature by making the heater heat the sensor chip, said control apparatus comprising:
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a power supply control device for selecting open loop control as the power supply control method when power begins to be supplied to the heater and, after that, switching the control method to feedback control, wherein under the open loop control, a predetermined power is supplied to the heater while under the feedback control, the power to be supplied to the heater is set based on the difference between the target temperature and the actual temperature of the sensor chip; and a switch judgment device for judging whether the switch timing from the open loop control to the feedback control has come; wherein the switch judgment device judges that the switch timing has come if a predetermined period of time in which the difference between the target temperature and the actual temperature is expected to fall within a predetermined reference difference has passed since power began to be supplied to the heater; and wherein the predetermined period of time is set so that the power to be supplied to the heater immediately after the open loop control is switched to the feedback control becomes equal to or lower than the power to be supplied under the open loop control.
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10. A temperature control apparatus for a heater-equipped sensor comprising a sensor chip which is activated by warm-up and a heater which is supplied with electric power to generate heat, wherein said control apparatus warms up the sensor chip to a predetermined target temperature equal to or higher than its activation temperature by making the heater heat the sensor chip, said control apparatus comprising:
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a power supply control device for selecting open loop control as a power supply control method when power begins to be supplied to the heater and, after that, switching the control method to feedback control, wherein the open loop control, a predetermined power is supplied to the heater while under the feedback control, the power to be supplied to the heater is set based on the difference between the target temperature and the actual temperature of the sensor chip; and a switch judgement device for judging whether the switch timing from the open loop control to the feedback control has come; wherein the switch judgement device judges that the switch timing has come if the difference between the target trmperature and the actual temperature falls within a predetermined reference difference; and wherein said reference difference is set so that the power to be supplied to the heater immediately after the open loop control is switched to the feedback control becomes equal to or lower than the power to be supplied under the open loop control.
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Specification