1. A control apparatus for a multi-cylinder in-cylinder injection type internal combustion engine which operates each fuel injector based on a fuel injection timing at each cylinder and makes a knock determination of each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder, the control apparatus comprising:
a determining device that determines whether mechanical noise produced by operation of the fuel injector at a second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to a first cylinder based on the fuel injection timing at the second cylinder and the knock determination period corresponding to the first cylinder; and
a setting device that sets the knock determination period corresponding to the first cylinder in accordance with a fuel injection timing at a second cylinder based on a determination result from the determining device so as to avoid a case in which the mechanical noise produced from operation of the fuel injector at the second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder.
2. The control apparatus for a multi-cylinder internal combustion engine according to claim 1, wherein the setting device sets the knock determination period corresponding to the first cylinder in accordance with the fuel injection timing at the second cylinder so that a timing of mechanical noise generation from operation of the fuel injector at the second cylinder does not overlap with the knock determination period corresponding to the first cylinder.
3. The control apparatus for a multi-cylinder internal combustion engine according to claim 1, wherein the setting device sets the knock determination period corresponding to the first cylinder according to the fuel injection timing at the second cylinder when the degree of effect of mechanical noise produced by operation of the fuel injector at the second cylinder on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder is large.
4. A control apparatus for a multi-cylinder in-cylinder injection type internal combustion engine which operates each fuel injector based on a fuel injection timing at each cylinder and makes a knock determination of each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder, the control apparatus comprising:
a determining device that determines whether mechanical noise produced by operation of the fuel injector at a second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to a first cylinder based on the fuel injection timing at the second cylinder and the knock determination period corresponding to the first cylinder; and
a setting device that sets the fuel injection timing at the second cylinder in accordance with the knock determination period corresponding to the first cylinder based on a determination result from the determining device so as to avoid a case in which mechanical noise produced from operation of the fuel injector at the second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder.
5. The control apparatus for a multi-cylinder internal combustion engine according to claim 4, wherein the setting device sets the fuel injection timing at the second cylinder in accordance with the knock determination period corresponding to the first cylinder so that a timing of mechanical noise generation from operation of the fuel injector at the second cylinder does not overlap with the knock determination period corresponding to the first cylinder.
6. The control apparatus for a multi-cylinder internal combustion engine according to claim 4, wherein the setting device firstly changes the knock determination period corresponding to the first cylinder so as to avoid a case in which mechanical noise produced from operation of the fuel injector at the second cylinder rides on the output signal from the knock sensor, and
when the knock determination period corresponding to the first cylinder has been changed to a point beyond which further change is not allowable, the setting device then sets the fuel injection timing at the second cylinder according to the knock determination period corresponding to the first cylinder.
7. A control apparatus for a multi-cylinder in-cylinder injection type internal combustion engine which operates each fuel injector based on a fuel injection timing at each cylinder and makes a knock determination of each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder, the control apparatus comprising:
a determining device that determines whether mechanical noise produced by operation of the fuel injector at a second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to a first cylinder based on the fuel injection timing at the second cylinder and the knock determination period corresponding to the first cylinder; and
a changing device that changes at least one of the fuel injection timing at the second cylinder and the knock determination period corresponding to the first cylinder based on a determination result from the determining device so as to avoid a case in which the mechanical noise produced by operation of the fuel injector at the second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder.
8. The control apparatus for a multi-cylinder internal combustion engine according to claim 7, wherein the changing device changes at least one of the fuel injection timing at the second cylinder and the knock determination period corresponding to the first cylinder based on a determination result from the determining device so as to avoid a case in which the timing of the mechanical noise generation and the knock determination period corresponding to the first cylinder overlap.
9. The control apparatus for a multi-cylinder internal combustion engine according to claim 7, wherein the changing device changes the knock determination period first and only changes the fuel injection timing after the knock determination period has been changed to a point beyond which further change is not allowable.
10. The control apparatus for a multi-cylinder internal combustion engine according to claim 1, wherein the changing device changes at least one of the fuel injection timing at the second cylinder and the knock determination period corresponding to the first cylinder when the effect from mechanical noise produced by operation of the fuel injector at the second cylinder on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder is large.
11. A method for setting a knock determination period in a multi-cylinder in-cylinder injection type internal combustion engine which makes a knock determination of each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder, the method comprising the step of:
setting the knock determination period corresponding to a first cylinder in accordance with a fuel injection timing at a second cylinder so as to avoid a case in which mechanical noise produced from operation of a fuel injector at the second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder.
12. The method for setting a knock determination period according to claim 11, wherein the knock determination period corresponding to the first cylinder is set in accordance with the fuel injection timing at the second cylinder so that a timing of the mechanical noise generation from operation of the fuel injector at the second cylinder does not overlap with the knock determination period corresponding to the first cylinder.
13. The method for setting a knock determination period according to claim 11, wherein the knock determination period corresponding to the first cylinder is set according to the fuel injection timing at the second cylinder when the degree of effect of mechanical noise produced by operation of the fuel injector at the second cylinder on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder is large.
14. A method for setting a fuel injection timing at each cylinder in a multi-cylinder internal combustion engine which makes a knock determination of each cylinder based on an output signal from a knock sensor during a knock determination period corresponding to each cylinder, the method comprising the step of:
setting the fuel injection timing at a second cylinder in accordance with the knock determination period corresponding to a first cylinder so as to avoid a case in which mechanical noise produced from operation of a fuel injector at the second cylinder rides on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder.
15. The method for setting a fuel injection timing according to claim 14, wherein the fuel injection timing at the second cylinder is set in accordance with the knock determination period corresponding to the first cylinder so that a timing of mechanical noise generation from operation of the fuel injector at the second cylinder does not overlap with the knock determination period corresponding to the first cylinder.
16. The method for setting a fuel injection timing according to claim 14, wherein the knock determination period corresponding to the first cylinder is first changed so as to avoid a case in which mechanical noise produced from operation of the fuel injector at the second cylinder rides on the output signal from the knock sensor, and
when the knock determination period corresponding to the first cylinder has been changed to a point beyond which further change is not allowable, the fuel injection timing at the second cylinder is then set according to the knock determination period corresponding to the first cylinder.
17. The method for setting a fuel injection timing according to claim 14, wherein the fuel injection timing at the second cylinder is set according to the knock determination period corresponding to the first cylinder when the degree of effect of mechanical noise produced by operation of the fuel injector at the second cylinder on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder is large.
18. The method for setting a knock determination period according to claim 12, wherein the knock determination period corresponding to the first cylinder is set according to the fuel injection timing at the second cylinder when the degree of effect of mechanical noise produced by operation of the fuel injector at the second cylinder on the output signal from the knock sensor during the knock determination period corresponding to the first cylinder is large.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for manufacturing a laminated ceramic electronic component, the method comprising the steps of:
preparing a component main body including a plurality of stacked ceramic layers and internal electrodes formed therein, the internal electrodes including exposed surfaces which are exposed at least one outer surface of the component main body; and
forming an external terminal electrode on the at least one outer surface of the component main body, the external terminal electrode being electrically connected to the internal electrodes; wherein
the step of forming the external terminal electrode includes a step of forming a plating layer on the exposed surfaces of the internal electrodes;
the method further includes a step of subjecting the component main body with the plating layer formed thereon to a heat treatment at a temperature of about 1000\xb0 C. or more; wherein
an average rate of temperature increase from room temperature to the temperature of about 1000\xb0 C. or more is set to about 100\xb0 C.min or more in the heat treatment step.
2. The method for manufacturing a laminated ceramic electronic component according to claim 1, wherein the plating layer includes copper as a main constituent.
3. A laminated ceramic electronic component comprising:
a component main body including a plurality of stacked ceramic layers and internal electrodes provided at interfaces between the plurality of stacked ceramic layers, the internal electrodes including exposed surfaces; and
an external terminal electrode provided on an outer surface of the component main body and electrically connected to the internal electrodes; wherein
the external terminal electrode includes a plated layer provided on the exposed surfaces of the internal electrodes in the component main body; and
the plating layer has a surface area ratio of about 1.01 or more.
4. The laminated ceramic electronic component according to claim 3, wherein
an interdiffusion region from which both a metal constituent included in the plating layer and a metal constituent included in the internal electrodes are detected is provided in a boundary section between the plating layer and the internal electrodes;
the interdiffusion region extends to both a side of the plating layer and a side of the internal electrodes; and
the interdiffusion region extends to a position of about 2 \u03bcm or more away from the exposed surfaces of the internal electrodes in the component main body.
5. The laminated ceramic electronic component according to claim 3, wherein the plating layer includes copper as a main constituent.