Vehicle

Patent metadata

Field	Value
Publication number	US-10308103-B2
Application number	US-201615175262-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Jun 10, 2015
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A feed pump supplies fuel to a port injection valve of an engine through low pressure fuel piping by applying a pressure to fuel. An engine ECU controls a fuel pressure which is a pressure applied to fuel by driving the feed pump. When the feed pump is driven to lower the fuel pressure, and it is determined that vapor is generated in the fuel piping, the engine ECU executes a fuel pressure control that increases the fuel pressure provided at the time of determination.

First claim

What is claimed is:

1. A vehicle comprising:
a combustion engine;
a pump configured to supply fuel to a fuel injection valve of the combustion engine through fuel piping by applying a pressure to fuel;
an electronic control unit configured to control a fuel pressure which is a pressure applied to fuel by driving the pump; and
a fuel pressure sensor configured to detect the fuel pressure,
when the pump is driven to lower the fuel pressure and it is determined that vapor is generated in the fuel piping, the electronic control unit executing a fuel pressure limitation control that increases the fuel pressure provided at the time of the determination, wherein
the fuel pressure limitation control increases the fuel pressure by performing a lower limit guard control that controls the fuel pressure such that the fuel pressure always becomes greater than a predetermined value,
the predetermined value is a value which is obtained by adding a predetermined pressure to an actual fuel pressure obtained by the fuel pressure sensor at the time when it is determined that the vapor is generated,
the electronic control unit is configured to:
stop the fuel pressure limitation control when an elapsed time from determination of generation of the vapor exceeds a predetermined time period; and
maintain the predetermined value in the predetermined time period from starting of the fuel pressure limitation control.

2. The vehicle according to claim 1 , wherein the electronic control unit executes an air-fuel ratio control for controlling an air-fuel ratio of air-fuel mixture supplied to the combustion engine to be a target value, and
the electronic control unit determines the generation of the vapor when a correction amount in a direction of lowering the air-fuel ratio by the air-fuel ratio control is greater than or equal to a predetermined amount.

3. The vehicle according to claim 1 further comprising:
an air-fuel ratio sensor configured to detect an air-fuel ratio of air-fuel mixture supplied to the combustion engine, wherein
the electronic control unit determines the generation of the vapor when the air-fuel ratio detected by the air-fuel ratio sensor is greater than a target value of the air-fuel ratio by a predetermined amount or greater.

4. The vehicle according to claim 1 , wherein the electronic control unit determines the generation of the vapor when actual torque outputted by the combustion engine is less than target torque of the combustion engine by a predetermined amount or greater.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kaneko Akihiro

Classifications

• F02D2041/389

  for injecting directly into the cylinder · CPC title

• Y02T10/6239

  Cross-Sectional Technologies · mapped topic

• F02D41/1477 Primary

  characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output) · CPC title

• F02D2200/1002

  Output torque · CPC title

• F02D2200/0602

  Fuel pressure · CPC title