Stop control system for direct-injection type internal combustion engine

Patent metadata

Field	Value
Publication number	US-10151261-B2
Application number	US-201615258857-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Sep 11, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A stop control system includes a direct-injection type internal combustion engine, a fuel injection valve, an accessory configured to be driven by the internal combustion engine, and a controller configured to operate the internal combustion engine. The controller is configured to control the accessory during a period from start of fuel cut to a moment immediately after the internal combustion engine stops, such that when the internal combustion engine stops completely, the output shaft comes, in a rotational direction, to a target stop position where an intake port is closed.

First claim

What is claimed is:

1. A stop control system comprising:
a direct-injection internal combustion rotary piston engine;
a triangle rotor that rotates around an output shaft of the engine;
a rotor housing that houses the rotor;
first, second and third apexes of the triangle rotor that slide along an inner peripheral surface of the rotor housing;
a fuel injection valve provided at the inner peripheral surface of the rotor housing, and having a fuel injection opening that injects fuel directly into a chamber defined in the internal combustion rotary piston engine;
an accessory configured to be driven by the internal combustion rotary piston engine; and
a controller configured to operate the internal combustion rotary piston engine, wherein
the internal combustion rotary piston engine has an intake port communicating with an inside of the chamber and configured to be opened and closed in synchronization with rotation of an output shaft of the internal combustion rotary piston engine,
an opening of the intake port formed at the inner peripheral surface of the rotor housing is at a point on a retard side in a rotational direction of the rotor with respect to the injection opening of the fuel injection valve, and
the controller controls the accessory to provide rotational resistance to the internal combustion rotary piston engine during a period from start of fuel cut that is cutting off of fuel supply to the internal combustion rotary piston engine by the fuel injection valve to a moment immediately after the internal combustion rotary piston engine stops, such that when the internal combustion rotary piston engine stops completely, at least one of the apexes of the triangle rotor stops between the fuel injection opening and the opening of the intake port, in a rotational direction.

2. The system of claim 1 , further comprising:
a position information acquirer configured to estimate or detect a position to which the output shaft comes in the rotational direction when the internal combustion rotary piston engine stops, wherein
the controller controls the accessory based on a signal from the position information acquirer so as to cause the output shaft to come, in the rotational direction, to the target stop position when the internal combustion rotary piston engine stops completely.

3. The system of claim 1 , wherein
the accessory is configured as a generator capable of driving the internal combustion rotary piston engine, and
the controller causes, by driving the internal combustion rotary piston engine by the generator, the output shaft to come, in the rotational direction, to the target stop position when the internal combustion rotary piston engine stops completely.

4. The system of claim 1 , wherein
during a period from start of the fuel cut which is carried out, upon satisfaction of a predetermined condition, for automatically stopping the internal combustion rotary piston engine to a moment when the internal combustion rotary piston engine stops, the controller controls the accessory such that the output shaft comes, in the rotational direction, to the target stop position when the internal combustion rotary piston engine stops completely.

5. The system of claim 4 , wherein
the controller causes, by providing rotational resistance to the internal combustion rotary piston engine by the accessory, the output shaft to come, in the rotational direction, to the target stop position when the internal combustion rotary piston engine stops completely.

6. The system of claim 5 , wherein
the accessory is configured as a generator capable of driving the internal combustion rotary piston engine, and
upon the output shaft arriving, in the rotational direction, at a position different from the target stop position when the internal combustion rotary piston engine stops, the controller drives the internal combustion rotary piston engine by the generator so as to cause the output shaft to come, in the rotational direction, to the target stop position.

7. The system of claim 4 , wherein
the accessory is configured as a generator capable of driving the internal combustion rotary piston engine, and
upon the output shaft arriving, in the rotational direction, at a position different from the target stop position when the internal combustion rotary piston engine stops, the controller drives the internal combustion rotary piston engine by the generator so as to cause the output shaft to come, in the rotational direction, to the target stop position.

8. The system of claim 1 , further comprising:
an ignition plug, wherein
the controller is configured to actuate, after the start of the fuel cut, the ignition plug in the chamber during a compression stroke.

9. A stop control system comprising:
a direct-injection internal combustion rotary piston engine having an intake port configured to be opened and closed in synchronization with rotation of an output shaft;
a triangle rotor that rotates around the output shaft;
a rotor housing that houses the rotor;
first, second and third apexes of the triangle rotor that slide along an inner peripheral surface of the rotor housing;
a fuel injection valve provided at the inner peripheral surface of the rotor housing, and having a fuel injection opening that injects fuel directly into a chamber which communicates with the intake port;
an accessory configured to be driven by the internal combustion rotary piston engine;
an opening of the intake port formed at the inner peripheral surface of the rotor housing is at a point on a retard side in a rotational direction of the rotor with respect to the injection opening of the fuel injection valve;
a position information acquirer configured to estimate or detect a position to which the output shaft comes in a rotational direction when the internal combustion rotary piston engine stops; and
an accessory controller that receives a signal from the position information acquirer during a period from start of fuel cut that is cutting off of fuel supply to the internal combustion rotary piston engine by the fuel injection valve to a moment immediately after the internal combustion rotary piston engine stops, and outputs a signal for controlling the accessory such that when the internal combustion rotary piston engine stops completely, at least one of the apexes of the triangle rotor stops between the fuel injection opening and the opening of the intake port, in a rotational direction.

10. The system of claim 9 , wherein
the accessory is configured as a generator,
the system further includes an inverter provided between the generator and the accessory controller, and
the accessary controller outputs a control signal to the inverter, and controls the generator via the inverter.

11. The system of claim 10 , wherein
during a period from the start of the fuel cut to a moment when the internal combustion rotary piston engine stops, the accessory controller outputs a control signal to the inverter such that the generator provides rotational resistance to the internal combustion rotary piston engine.

12. The system of claim 10 , wherein
immediately after a moment when the internal combustion rotary piston engine stops, the accessory controller outputs a control signal to the inverter such that the generator drives the internal combustion rotary piston engine so as to cause the output shaft to come, in the rotational direction, to a target stop position.

13. The system of claim 9 , wherein
the accessory is a generator that performs motoring of the internal combustion rotary piston engine,
the accessory controller operates the generator motoring the internal combusti

Assignees

• Mazda Motor

Inventors

• Yokoyama Tetsuya
• Kagawa Ryoji

Classifications

• F02N11/04

  the motors being associated with current generators · CPC title

• F01C1/22

  of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth- equivalents than the outer member · CPC title

• F02N19/005

  Aiding engine start by starting from a predetermined position, e.g. pre-positioning or reverse rotation · CPC title

• F02B53/12

  Ignition · CPC title

• B60K6/46

  Series type · CPC title