Motor vehicle

Patent metadata

Field	Value
Publication number	US-10145328-B2
Application number	US-201715835668-A
Country	US
Kind code	B2
Filing date	Dec 8, 2017
Priority date	Dec 13, 2016
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

After a system-off state has continued for a preset, time period since a system-off operation, on satisfaction of abnormality diagnosis prerequisites including a condition that a warm-up determination parameter indicating a degree of warm-up of an engine at a system-off time is equal to or greater than a predetermined value, characteristic abnormality diagnosis is performed to determine whether a characteristic abnormality occurs in a fuel pressure sensor. For a time period from a system-on operation to a system-off operation, the warm-up determination parameter is incremented when the engine is in operation, while being decremented after satisfaction of a predetermined condition when the engine is not in operation.

First claim

The invention claimed is:

1. A motor vehicle, comprising:
an engine including an in-cylinder injection valve configured to inject, a fuel in a cylinder;
a fuel supply device including a high-pressure fuel pump configured to pressurize the fuel from a fuel tank and supply the pressurized fuel to a supply flow path that is connected with the in-cylinder injection valve;
a fuel pressure sensor configured to detect a pressure of the fuel in the supply flow path; and
a control device configured to control the engine and the fuel supply device and to perform characteristic abnormality diagnosis that determines whether a characteristic abnormality occurs in the fuel pressure sensor, on satisfaction of abnormality diagnosis prerequisites that include a condition that a warm-up determination parameter indicating a degree of warm-up of the engine at a system-off time is equal to or greater than a predetermined value, after a system-off state has continued for a preset time period since a system-off operation, wherein
for a time period from a system-on operation to a system-off operation, the control device increments the warm-up determination parameter when the engine is in operation, while decrementing the warm-up determination parameter after satisfaction of a predetermined condition when the engine is not in operation.

2. The motor vehicle according to claim 1 ,
wherein the warm-up determination parameter is either a parameter based on integration of an operation time of the engine or a parameter based on integration of an intake air amount of the engine.

3. The motor vehicle according to claim 1 ,
wherein the warm-up determination parameter is decremented by a decrement value that increases with a decrease in ambient temperature and/or increases with an increase in vehicle speed.

4. The motor vehicle according to claim 1 ,
wherein the predetermined condition is a condition that a predetermined time period has elapsed since a stop of the engine.

5. The motor vehicle according to claim 4 ,
wherein the predetermined time period is a time period that, decreases with a decrease in ambient temperature or a time period that decreases with an increase in vehicle speed.

6. The motor vehicle according to claim 1 ,
wherein the control device increments the warm-up determination parameter until satisfaction of the predetermined condition even when the engine is not in operation.

7. The motor vehicle according to claim 1 , further comprising:
a grill shutter of an adjustable opening provided in front of the engine, wherein
the warm-up determination parameter is decremented by a decrement value that increases with an increase in opening of the grill shutter.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ohori Shinya
• Hyodo Junji

Classifications

• F02D2041/224

  Diagnosis of the fuel system · CPC title

• F02D41/38

  of the high pressure type · CPC title

• B60W10/06

  including control of combustion engines · CPC title

• F02D41/22 Primary

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02D2200/0606

  Fuel temperature · CPC title