US 11,654,749 B2
Heater control device
Kimitake Ishikawa, Kariya (JP); Hideaki Kako, Kariya (JP); Hiroyasu Oide, Kariya (JP); Shiro Bando, Kariya (JP); and Hidenori Arai, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Dec. 27, 2018, as Appl. No. 16/233,170.
Application 16/233,170 is a continuation of application No. PCT/JP2017/019563, filed on May 25, 2017.
Claims priority of application No. JP2016-132564 (JP), filed on Jul. 4, 2016.
Prior Publication US 2019/0126723 A1, May 2, 2019
Int. Cl. B60H 1/22 (2006.01); H05B 3/00 (2006.01); H05B 3/12 (2006.01); B60H 1/00 (2006.01); H02H 9/02 (2006.01)
CPC B60H 1/2218 (2013.01) [B60H 1/00807 (2013.01); B60H 1/22 (2013.01); B60H 1/2226 (2019.05); H02H 9/02 (2013.01); H05B 3/00 (2013.01); H05B 3/0023 (2013.01); H05B 3/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A heater control device that controls an electric heater which includes a plurality of heat generating portions that generate heat when energized and which radiates the heat of the plurality of heat generating portions, the heater control device comprising:
a microcontroller that determines whether or not a total energization current value, which is a current value to be supplied to the electric heater when all of the plurality of heat generating portions are energizable, exceeds a predetermined current limit value; and
when the microcontroller determines that the total energization current value exceeds the current limit value, executes a first switch circuit which energizes the electric heater while switching, among any or all of the plurality of heat generating portions, those to be turned to a non-energizable off state, and
when the microcontroller determines the total energization current value is equal to or less than the current limit value, executes a second switch circuit which energizes the electric heater with all of the plurality of heat generating portions being energizable.
 
7. A heater control device that controls an electric heater which includes a plurality of heat generating portions that generate heat when energized and which radiates the heat of the plurality of heat generating portions, the heater control device comprising:
a microcontroller that determines whether or not a total energization current value, which is a current value to be supplied to the electric heater when a voltage is applied to the plurality of heat generating portions in a predetermined state, exceeds a predetermined current limit value; and
when the microcontroller determines that the total energization current value exceeds the current limit value, limit the voltage applied to any or all of the plurality of heat generating portions as compared to the predetermined state, and
when the microcontroller determines that the total energization current value is equal to or less than the current limit value, release the limit on the applied voltage.
 
8. A heating system, comprising:
an electric heater which includes a plurality of heat generating portions that generate heat when energized; and
a heater controller coupled to the electric heater, the heater controller being programmed to:
determine whether an estimated total energization current value, which is a current value to be supplied to the electric heater assuming that all of the plurality of heat generating portions are energizable, exceeds a predetermined current limit value,
when the heater controller determines that the total energization current value exceeds the current limit value, executes a first switch circuit which energizes the electric heater while switching, among any or all of the plurality of heat generating portions, those to be turned to a non-energizable off state, and
when the heater controller determines that the total energization current value is equal to or less than the current limit value, executes a second switch circuit which energizes the electric heater with all of the plurality of heat generating portions being energizable.