US 9,810,677 B2
Urea water suitability determination device
Toshiya Akiyoshi, Hino (JP)
Assigned to HINO MOTORS, LTD., Tokyo (JP)
Appl. No. 14/786,061
Filed by Hino Motors, Ltd., Tokyo (JP)
PCT Filed Jun. 12, 2014, PCT No. PCT/JP2014/065603
§ 371(c)(1), (2) Date Oct. 21, 2015,
PCT Pub. No. WO2014/203802, PCT Pub. Date Dec. 24, 2014.
Claims priority of application No. 2013-126775 (JP), filed on Jun. 17, 2013.
Prior Publication US 2016/0146776 A1, May 26, 2016
Int. Cl. G01N 33/18 (2006.01); F01N 11/00 (2006.01); G01N 25/00 (2006.01); G01N 29/024 (2006.01); F01N 3/20 (2006.01)
CPC G01N 33/1826 (2013.01) [F01N 3/2066 (2013.01); F01N 11/002 (2013.01); G01N 25/00 (2013.01); G01N 29/024 (2013.01); F01N 2550/05 (2013.01); F01N 2610/02 (2013.01); F01N 2900/08 (2013.01); F01N 2900/1811 (2013.01); F01N 2900/1818 (2013.01); G01N 2291/011 (2013.01); Y02T 10/24 (2013.01); Y02T 10/47 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A urea water suitability determination device comprising:
a concentration detecting section, which detects a concentration of urea water and outputs the detected value;
a determining section, which determines whether the urea water is suitable by using the detected value output from the concentration detecting section; and
a temperature detecting section, which detects temperatures of a plurality of detection targets at different locations in a vehicle, wherein
the detection targets have temperatures that are different from one another during operation of an engine,
the determining section is adapted to:
calculate a temperature difference between a temperature of a particular detection target and a temperature of another detection target among the detection targets; and
when a determination start condition is satisfied, start determining whether the urea water is suitable,
the determination start condition includes that the temperature difference is within a reference range, and
the reference range is defined as a range of temperature differences in which it is determined that the urea water is in a quiescent state, which is suitable for the determination,
the detection targets include the urea water,
the concentration detecting section is adapted to detect a concentration of the urea water based on a temperature of the urea water and a propagation velocity of an ultrasonic wave in the urea water,
the determining section is adapted to:
determine suitability of the urea water at a first determining opportunity, where the urea water is at a first temperature, and
determine suitability of the urea water at a second determining opportunity, where the urea water is at a second temperature, which is different from the first temperature,
the urea water suitability determination device further comprises a heating section for heating the urea water,
the determining section is adapted to:
when the urea water is determined as suitable at the first determining opportunity, heat the urea water by the heating section,
determine whether a changing amount of the urea water temperature from the first temperature exceeds a preset amount, and
when the changing amount exceeds the preset amount, determines suitability of the urea water at the second determining opportunity.