Engine oil deterioration diagnosis device

Patent metadata

Field	Value
Publication number	US-10329973-B2
Application number	US-201715458426-A
Country	US
Kind code	B2
Filing date	Mar 14, 2017
Priority date	Mar 25, 2016
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

Provided is an engine oil deterioration diagnosis device (10) comprising annual traveling distance calculating part (16), a used hour calculating part (18), a severe condition determining part (20), an oil traveling distance calculating part (22), an oil traveling distance accumulating part (24), and an engine oil deterioration diagnosis part (26) for diagnosing that engine oil is in a state of deterioration when an oil traveling distance accumulated by the oil traveling distance accumulating part reached a predetermined value, wherein the oil traveling distance calculating part (22) comprises an oil traveling distance addition correcting part (32) for calculating the oil traveling distance by adding a predetermined value to the traveling distance when the severe condition determining part determines the state as the severe condition.

First claim

What is claimed is:

1. An engine oil deterioration diagnosis device for diagnosing engine oil deterioration in an engine of a vehicle, comprising:
an annual traveling distance calculating part for calculating an annual traveling distance based on a traveling distance detected by a traveling distance detecting device;
a used hour calculating part for calculating used hours per predetermined period of the vehicle based on used hours of the vehicle;
a severe condition determining part for determining a severe condition when a relationship between the annual traveling distance and the used hours per predetermined period meets a determining criteria of the severe condition;
an oil traveling distance calculating part for calculating an oil traveling distance based on the traveling distance;
an oil traveling distance accumulating part for accumulating the oil traveling distance calculated by the oil traveling distance calculating part to calculate an accumulated oil traveling distance; and
an engine oil deterioration diagnosis part for diagnosing that the engine oil is in a state of deterioration when the accumulated oil traveling distance calculated by the oil traveling distance accumulating part reached a predetermined value;
wherein the oil traveling distance calculating part comprises:
an oil traveling distance normal adding part for calculating the oil traveling distance by adopting the traveling distance, when the severe condition determining part does not determine the state as being in the severe condition; and
an oil traveling distance addition correcting part for calculating the oil traveling distance by adding a predetermined value to the traveling distance, when the severe condition determining part determines the state as being in the severe condition.

2. The engine oil deterioration diagnosis device as recited in claim 1 , wherein the oil traveling distance calculating part further comprises an oil traveling distance initial correcting part,
wherein the oil traveling distance initial correcting part is configured to adopt the oil traveling distance calculated by the oil traveling distance normal adding part until the traveling distance of the vehicle reaches a predetermined value counted from the timing of vehicle production or the timing of engine oil replacement, and to determine as to whether the oil traveling distance calculated by the oil traveling distance addition correcting part shall be adopted for the predetermined traveling distance after the traveling distance of the vehicle has reached the predetermined traveling distance.

3. The engine oil deterioration diagnosis device as recited in claim 1 , wherein the oil traveling distance calculating part further comprises an oil traveling distance reduction correcting part,
wherein the oil traveling distance reduction correcting part is configured to calculate a reduced oil traveling distance having a value reduced from the traveling distance during a period when, after determination of a state by the severe condition determining part has changed from the severe condition to a non-severe condition, the state determined as the non-severe condition continues.

4. The engine oil deterioration diagnosis device as recited in claim 3 , wherein the oil traveling distance calculating part further comprises an oil traveling distance reduction limiting part,
wherein the oil traveling distance reduction limiting part is configured to limit the adoption of the oil traveling distance calculated by the oil traveling distance reduction correcting part if the accumulated oil traveling distance obtained by accumulating the reduced oil traveling distance calculated by the oil traveling distance reduction correcting part becomes equal to a value of the traveling distance in the period from the timing of vehicle production or the timing of engine oil replacement to the timing of determination.

Assignees

• Mazda Motor

Inventors

• Handa Tomohisa
• Nishi Kunihiro
• Okazawa Hisashi
• Ujihara Kenko

Classifications

• F01M2011/1486

  by considering duration of operation · CPC title

• F01M2011/1426

  by considering distance · CPC title

• F01M11/10 Primary

  Indicating devices; Other safety devices · CPC title