# US 2020/0400091 A1 · Internal combustion engine control device and control method

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- Number: US 2020/0400091 A1
- Document ID: US20200400091A1
- Status: Published application
- Kind: A1
- Application number: 16/643,876
- Filed: 2018-08-23
- Published: 2020-12-24
- Earliest claimed: 2017-09-05
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Takahiko NIWA; Masanori TOYA; Takashi YOSHIDA; Takayuki OMACHI
- Web page: https://patentgrep.com/patent/US20200400091A1

## CPC

- F02D 13/0238: {by shifting the phase, i.e. the opening periods of the valves are constant}
- F02D 41/345: {Controlling injection timing (F02D41/365 takes precedence)}
- F02D 13/0223: {Variable control of the intake valves only}
- F02D 13/0261: {Controlling the valve overlap}
- F02D 41/008: {Controlling each cylinder individually}
- F02D 41/0235: {in relation with the state of the exhaust gas treating apparatus (control of exhaust gas treating apparatus per se F01N)}
- F02D 41/024: {to increase temperature of the exhaust gas treating apparatus}
- F02D 41/047: {Taking into account fuel evaporation or wall wetting; (special correction after fuel cut-off F02D41/126)}
- F02D 41/062: {for starting (F02D41/061 takes precedence)}
- F02D 41/1454: {the characteristics being an oxygen content or concentration or the air-fuel ratio}
- F02D 41/1459: {the characteristics being a hydrocarbon content or concentration}
- F02D 41/1466: {the characteristics being a soot concentration or content}
- F02D 41/34: with means for controlling injection timing or duration
- F02D 41/182: {for the control of a fuel injection device}
- F02D 2200/021: Engine temperature
- F02D 2200/0414: Air temperature
- F02D 2200/0802: Temperature of the exhaust gas treatment apparatus
- F02D 2200/101: Engine speed
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided are an internal combustion engine control device and control method in which a multi-injection process comprises performing an intake synchronized injection and an intake asynchronous injection to inject a required injection amount of fuel by operating a port injection valve for injecting fuel into an intake passageway. A variable process includes variably setting an injection timing for the intake synchronized injection on the basis of at least two of three parameters. The injection timing for the intake synchronized injection is expressed by the rotation angle of a crank shaft of an internal combustion engine. The three parameters include a rotational speed of the crank shaft of the internal combustion engine, a valve-opening start timing of an intake valve, and a temperature of an intake system of the internal combustion engine.

## Claims

### Claim 1

A control device for an internal combustion engine, the internal combustion engine to which the control device is applied including a port injection valve that injects fuel into an intake passage, wherein the control device is configured to execute:
a multiple injection process for executing an intake synchronous injection and an intake asynchronous injection to inject fuel of a requested injection amount by operating the port injection valve, the requested injection amount being requested in a single combustion cycle, the intake synchronous injection injecting fuel in synchronization with an open period of an intake valve, the intake asynchronous injection injecting fuel at a timing advanced with respect to a timing of the intake synchronous injection; and
a variably setting process for variably setting an injection timing of the intake synchronous injection based on at least two parameters of three parameters, the injection timing of the intake synchronous injection being represented by a rotation angle of a crankshaft of the internal combustion engine, the three parameters referring to a rotation speed of the crankshaft of the internal combustion engine, an opening start timing of the intake valve that changes an overlap amount of the intake valve and an exhaust valve, and a temperature of an intake system of the internal combustion engine.

### Claim 2 (depends on 1)

The control device according to claim 1, wherein
the control device is further configured to execute a requested injection amount calculation process for calculating the requested injection amount as an injection amount to control an air-fuel ratio to a target air-fuel ratio based on an amount of fresh air filling a cylinder of the internal combustion engine, and
the variably setting process is a process for variably setting the injection timing of the intake synchronous injection based on load of the internal combustion engine in addition to the at least two parameters.

### Claim 3 (depends on 2)

The control device according to claim 2, wherein the variably setting process includes
an end timing setting process for variably setting a reach end timing based on the rotation speed, the temperature of the intake system, and the load, the reach end timing being a target value of a timing at which fuel injected from the port injection valve at a latest timing reaches an inlet of a combustion chamber of the internal combustion engine, and
a start timing calculation process for calculating an injection start timing of the intake synchronous injection based on the reach end timing.

### Claim 4 (depends on 3)

The control device according to claim 3, wherein
the internal combustion engine includes a valve actuation variable device configured to vary a valve actuation of the intake valve,
the control device is further configured to execute a valve actuation controlling process for variably controlling the opening start timing of the intake valve by operating the valve actuation variable device,
the end timing setting process includes a retardation amount calculation process for calculating a retardation amount of the reach end timing with respect to the opening start timing of the intake valve based on the rotation speed, the temperature of the intake system, and the load, and
the end timing setting process is a process for setting, as the reach end timing, a timing retarded by the retardation amount with respect to the opening start timing of the intake valve.

### Claim 5 (depends on 1)

The control device according to claim 1, wherein the variably setting process includes
an end timing setting process for variably setting a reach end timing based on the rotation speed of the crankshaft, the reach end timing being a target value of a timing at which fuel injected from the port injection valve at a latest timing reaches an inlet of a combustion chamber of the internal combustion engine, and
a start timing calculation process for calculating an injection start timing of the intake synchronous injection based on the reach end timing.

### Claim 6 (depends on 5)

The control device according to claim 5, wherein the end timing setting process includes a process for variably setting the reach end timing based on the load of the internal combustion engine in addition to the rotation speed.

### Claim 7 (depends on 6)

The control device according to claim 6, wherein
the internal combustion engine includes a valve actuation variable device configured to vary a valve actuation of the intake valve,
the control device further executes a valve actuation controlling process for variably controlling the opening start timing of the intake valve by operating the valve actuation variable device,
the end timing setting process includes a retardation amount calculation process for calculating a retardation amount of the reach end timing with respect to the opening start timing of the intake valve based on the rotation speed and the load, and
the end timing setting process is a process for setting, as the reach end timing, a timing retarded by the retardation amount with respect to the opening start timing of the intake valve.

### Claim 8 (depends on 1)

The control device according to claim 1, wherein
the internal combustion engine further includes a catalyst that purifies exhaust gas discharged to an exhaust passage,
the requested injection amount is a fuel amount injected from the port injection valve in the multiple injection process in order to control an air-fuel ratio to a target air-fuel ratio, and
the control device is further configured to execute an advancement process for setting the injection timing of the intake synchronous injection to be more advanced when a temperature of the catalyst is low than when the temperature of the catalyst is high.

### Claim 9 (depends on 8)

The control device according to claim 8, wherein
the internal combustion engine includes a valve actuation variable device configured to vary a valve actuation of the intake valve,
the control device is further configured to execute a valve actuation controlling process for variably controlling an opening start timing of the intake valve by operating the valve actuation variable device,
the variably setting process variably sets the injection timing of the intake synchronous injection in accordance with the opening start timing of the intake valve,
the variably setting process includes
a reference timing setting process for setting the injection start timing of the intake synchronous injection based on the opening start timing of the intake valve,
a guard value setting process for setting, in accordance with the temperature of the intake system of the internal combustion engine, a retarded guard value for a case of when the temperature of the catalyst is less than a given value, and
a low-temperature timing setting process for setting, as the injection timing of the intake synchronous injection, a more advanced timing of the retarded guard value and an injection timing set through the reference timing setting process when the temperature of the catalyst is less than the given value, and
the variably setting process is a process for setting, as the injection timing of the intake synchronous injection, the injection timing set through the reference timing setting process when the temperature of the catalyst is greater than or equal to the given value.

### Claim 10

A control device for an internal combustion engine, the control device being applied to the internal combustion engine that includes a port injection valve that injects fuel into an intake passage, wherein the control device is configured to execute:
a multiple injection process for executing an intake synchronous injection and an intake asynchronous injection to inject fuel of a requested injection amount by operating the port injection valve, the requested injection amount being requested in a single combustion cycle, the intake synchronous injection injecting fuel in synchronization with an open period of an intake valve, the intake asynchronous injection injecting fuel at a timing advanced with respect to a timing of the intake synchronous injection; and
a variably setting process for variably setting an injection timing of the intake synchronous injection represented by a rotation angle of a crankshaft of the internal combustion engine, and
the variably setting process includes
an end timing setting process for variably setting a reach end timing based on a rotation speed of the crankshaft, the reach end timing being a target value of a timing at which fuel injected from the port injection valve at a latest timing reaches an inlet of a combustion chamber of the internal combustion engine, and
a start timing calculation process for calculating an injection start timing of the intake synchronous injection based on the reach end timing.

### Claim 11

A control device for an internal combustion engine, the internal combustion engine to which the control device is applied including a port injection valve that injects fuel into an intake passage and a catalyst that purifies exhaust gas discharged to an exhaust passage, wherein the control device is configured to execute:
a multiple injection process for executing an intake synchronous injection and an intake asynchronous injection to inject fuel of a requested injection amount for controlling an air-fuel ratio to a target air-fuel ratio by operating the port injection valve, the requested injection amount being requested in a single combustion cycle, the intake synchronous injection injecting fuel in synchronization with an open period of an intake valve, the intake asynchronous injection injecting fuel at a timing advanced with respect to a timing of the intake synchronous injection; and
an advancement process for setting the injection timing of the intake synchronous injection to be more advanced when a temperature of the catalyst is low than when the temperature of the catalyst is high.

### Claim 12

A control method for an internal combustion engine, the internal combustion engine including a port injection valve that injects fuel into an intake passage, wherein the control method comprises:
executing an intake synchronous injection and an intake asynchronous injection to inject fuel of a requested injection amount by operating the port injection valve, the requested injection amount being requested in a single combustion cycle, the intake synchronous injection injecting fuel in synchronization with an open period of an intake valve, the intake asynchronous injection injecting fuel at a timing advanced with respect to a timing of the intake synchronous injection; and
variably setting an injection timing of the intake synchronous injection based on at least two parameters of three parameters, the injection timing of the intake synchronous injection being represented by a rotation angle of a crankshaft of the internal combustion engine, the three parameters referring to a rotation speed of the crankshaft of the internal combustion engine, an opening start timing of the intake valve that changes an overlap amount of the intake valve and an exhaust valve, and a temperature of an intake system of the internal combustion engine.

### Claim 13

A control method for an internal combustion engine, the internal combustion engine to which the control method is applied including a port injection valve that injects fuel into an intake passage and a catalyst that purifies exhaust gas discharged to an exhaust passage, wherein the method comprises:
executing an intake synchronous injection and an intake asynchronous injection to inject fuel of a requested injection amount for controlling an air-fuel ratio to a target air-fuel ratio by operating the port injection valve, the requested injection amount being requested in a single combustion cycle, the intake synchronous injection injecting fuel in synchronization with an open period of an intake valve, the intake asynchronous injection injecting fuel at a timing advanced with respect to a timing of the intake synchronous injection; and
setting the injection timing of the intake synchronous injection to be more advanced when a temperature of the catalyst is low than when the temperature of the catalyst is high.

### Claim 14

A non-transitory computer-readable medium that stores a program for causing a processor to execute a control process for an internal combustion engine, the internal combustion engine including a port injection valve that injects fuel into an intake passage, the control process comprises:
executing an intake synchronous injection and an intake asynchronous injection to inject fuel of a requested injection amount by operating the port injection valve, the requested injection amount being requested in a single combustion cycle, the intake synchronous injection injecting fuel in synchronization with an open period of an intake valve, the intake asynchronous injection injecting fuel at a timing advanced with respect to a timing of the intake synchronous injection; and
variably setting an injection timing of the intake synchronous injection based on at least two parameters of three parameters, the injection timing of the intake synchronous injection being represented by a rotation angle of a crankshaft of the internal combustion engine, the three parameters referring to a rotation speed of the crankshaft of the internal combustion engine, an opening start timing of the intake valve that changes an overlap amount of the intake valve and an exhaust valve, and a temperature of an intake system of the internal combustion engine.