Internal combustion engine control device

Patent metadata

Field	Value
Publication number	US-10352254-B2
Application number	US-201414893588-A
Country	US
Kind code	B2
Filing date	May 28, 2014
Priority date	May 30, 2013
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

An internal combustion engine control device for a dual-injection internal combustion engine acquires first and second increase values, which are fuel increase ratios according to respective alcohol concentrations of a fuel injected by cylinder injection and a fuel injected by port injection. The control device determines a basic total injection amount of fuel that should be supplied to each cylinder in the case where the alcohol concentration of the fuel is zero. An amount of fuel injected from a cylinder injection valve is determined as if the alcohol concentration of the fuel were zero. A total injection amount is to correspond to an amount in accordance with the basic total injection amount and both, the first increase value and the second increase value, so that the increase in injected fuel amount is borne by port injection.

First claim

What is claimed is:

1. An internal combustion engine control device for an internal combustion engine that uses a fuel in which alcohol is mixed with a hydrocarbon fuel, and that includes:
a cylinder injection valve provided in each of a plurality of cylinders and configured to directly inject a fuel into each of the cylinders; and
a port injection valve configured to inject a fuel to an intake port connected to each of the cylinders, the internal combustion engine control device comprising:
a first acquisition portion programmed to acquire a first increase value, which is a fuel increase ratio in response to a detected alcohol concentration of the fuel injected from the cylinder injection valve, the fuel increase ratio being relative to a fuel injection amount of a case where the alcohol concentration of the fuel is zero;
a second acquisition portion programmed to acquire a second increase value, which is a fuel increase ratio in response to a detected alcohol concentration of the fuel injected from the port injection valve, the fuel increase ratio being relative to the fuel injection amount of the case where the alcohol concentration of the fuel is zero;
an acquisition portion programmed to acquire a basic total injection amount, which is a total amount of the fuel required to be supplied to each of the cylinders in the case where the alcohol concentration of the fuel is zero; and
a determination portion programmed to determine a cylinder injection amount, which is a fuel amount injected from the cylinder injection valve, and a port injection amount, which is a fuel amount injected from the port injection valve, so that the cylinder injection amount becomes an injection amount required to be injected from the cylinder injection valve in the case where the alcohol concentration of the fuel is zero, and a total injection amount of the cylinder injection amount and the port injection amount becomes a total fuel amount, which is an amount obtained by increasing the basic total injection amount according to the first increase value and the second increase value, wherein the determination portion is programmed to calculate the port injection amount based on the following formula (1)
PFI =(Total− DI/EGd )× EGp   (1)

where PFI is the port injection amount, Total is the total injection amount, DI is the cylinder injection amount, EGd is the first increase value, and EGp is the second increase value, wherein a value of EGd varies based on a first relationship with the detected alcohol concentration of the fuel injected from the cylinder injection valve, and a value of EGp varies based on a second relationship with the detected alcohol concentration of the fuel injected from the port injection valve.

2. The internal combustion engine control device according to claim 1 , wherein:
the determination portion calculates an equivalent amount of the fuel injected from the cylinder injection valve, which is an amount corresponding to the fuel having an alcohol concentration of zero, according to the first increase value, and calculates the port injection amount by increasing an amount obtained by subscribing the equivalent amount from the basic total injection amount according to the second increase value.

3. The internal combustion engine control device according to claim 1 , wherein:
the internal combustion engine further includes:
a fuel pipe which is connected to a fuel tank and which supplies the fuel;
a first pipe which is connected to the fuel pipe and which supplies the fuel to the cylinder injection valve;
a second pipe which is connected to the fuel pipe and which supplies the fuel to the port injection valve; and
a concentration sensor which is provided in the fuel pipe and which detects an output an alcohol concentration of the fuel;
the internal combustion engine control device further comprises:
a first estimation portion programmed to estimate a concentration of the fuel injected from the cylinder injection valve, according to a volume of the fuel pipe on a downstream side from the concentration sensor and a volume of the first pipe, an accumulation value of the port injection amount and an accumulation value of the cylinder injection amount, and an output from the concentration sensor; and
a second estimation portion programmed to estimate a concentration of the fuel injected from the port injection valve according to the volume of the fuel pipe on the downstream side from the concentration sensor and a volume of the second pipe, the accumulation value of the cylinder injection amount and the accumulation value of the port injection amount, and the output from the concentration sensor;
the first acquisition portion acquires the first increase value by use of an estimated value of the concentration of the fuel which is estimated by the first estimation portion; and
the second acquisition portion acquires the second increase value by use of an estimated value of the concentration of the fuel which is estimated by the second estimation portion.

4. The internal combustion engine control device according to claim 3 , further comprising:
a concentration detecting portion configured to detect an alcohol concentration of the fuel according to an output from the concentration sensor at a given first time point;
a second-time-point detecting portion configured to detect a second time point at which a total of the accumulation value of the cylinder injection amount and the accumulation value of the port injection amount after the first time point reaches the volume of the fuel pipe on the downstream side from the concentration sensor;
a third-time-point detecting portion configured to detect a third time point at which the accumulation value of the cylinder injection amount after the second time point reaches the volume of the first pipe; and
a fourth-time-point detecting portion configured to detect a fourth time point at which the accumulation value of the port injection amount after the second time point reaches the volume of the second pipe, wherein:
the first estimation portion estimates a concentration of the fuel at the third time point according to the alcohol concentration at the first time point; and
the second estimation portion estimates a concentration of the fuel at the fourth time point according to the alcohol concentration at the first time point.

Assignees

• Toyota Motor Co Ltd

Inventors

• Wakao Kazuhiro

Classifications

• F02D19/087

  with determination of densities, viscosities, composition, concentration or mixture ratios of fuels · CPC title

• F02D19/084

  Blends of gasoline and alcohols, e.g. E85 · CPC title

• F02D2200/0612

  determined by estimation · CPC title

• F02D19/0639

  characterised by the type of fuels · CPC title

• F02D2041/3881

  with multiple common rails, e.g. one rail per cylinder bank, or a high pressure rail and a low pressure rail · CPC title