1. An engine fuel injection control apparatus for an engine comprising:
an excess air ratio control section configured to control an excess air ratio to a target excess air ratio that is determined based on an engine operating condition of the engine;
a fuel injection timing control section configured to control a fuel injection timing to a target fuel injection timing that is determined based on the engine operating condition;
an actual excess air ratio computing section configured to compute an actual excess air ratio of the engine; and
a fuel injection timing adjustment section configured to adjust the fuel injection timing to obtain an adjusted fuel injection timing based on the actual excess air ratio that was computed when an amount of adjustment in the target excess air ratio is larger than a prescribed value.
2. The engine fuel injection control apparatus as recited in claim 1, wherein
the excess air ratio control section is configured to detect a fuel injection quantity and an engine rotational speed as the engine operating condition, and to set the target excess air ratio by using a map configured to provide the target excess air ratio corresponding to the fuel injection quantity and the engine rotational speed that were detected.
3. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing adjustment section is configured to adjust the fuel injection timing by interpolating in accordance with a ratio of the actual excess air ratio with respect to the target excess air ratio in effect before the adjustment in the target excess air ratio and the target excess air ratio that will take effect after the adjustment in the target excess air ratio.
4. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing adjustment section is configured to adjust the fuel injection timing using a first order delay filter having a time constant determined using the actual excess air ratio.
5. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing adjustment section is configured to obtain adjusted fuel injection timing by multiplying the difference between a current value of the target injection timing and a previous value of a fuel injection timing command by an adjustment coefficient determined using the actual excess air ratio and adding the previous value to a resulting product.
6. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing adjustment section is configured to adjust the fuel injection timing when rich spike control is being executed for regenerating a NOx trapping catalytic converter provided in an engine exhaust system.
7. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing adjustment section is configured to adjust the fuel injection timing when exhaust gas temperature-increasing control is being executed for the regenerating an exhaust gas fine particle filter provided in an engine exhaust system.
8. The engine fuel injection control apparatus as recited in claim 1, wherein
the excess air ratio control section is configured control the excess air ratio by adjusting an opening degree of a throttle valve installed in an air intake passage for adjusting an intake air quantity.
9. The engine fuel injection control apparatus as recited in claim 1, wherein
the excess air control section is configured to control the excess air ratio by using a first excess air ratio map configured to provide a lean target value corresponding to the engine operating condition for lean operation, and using a second excess air ratio map configured to provide a rich target value corresponding to the engine operation condition for rich operation.
10. The engine fuel injection control apparatus as recited in claim 9, wherein
the fuel injection timing control section is configured to control the fuel injection timing by using a first injection timing map to provide a lean target value corresponding to lean operation, and using a second injection timing map configured to provide a rich target value corresponding to the engine operating condition for rich operation.
11. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing control section is configured to control the fuel injection timing by using a first injection timing map to provide a lean target value corresponding to lean operation, and using a second injection timing map configured to provide a rich target value corresponding to the engine operating condition for rich operation.
12. The engine fuel injection control apparatus as recited in claim 3, wherein
the excess air control section is configured to control the excess air ratio by using a first excess air ratio map configured to provide a lean target value corresponding to the engine operating condition for lean operation, and using a second excess air ratio map configured to provide a rich target value corresponding to the engine operation condition for rich operation.
13. The engine fuel injection control apparatus as recited in claim 12, wherein
the fuel injection timing control section is configured to control the fuel injection timing by using a first injection timing map to provide a lean target value corresponding to lean operation, and using a second injection timing map configured to provide a rich target value corresponding to the engine operating condition for rich operation.
14. The engine fuel injection control apparatus as recited in claim 3, wherein
the fuel injection timing control section is configured to control the fuel injection timing by using a first injection timing map to provide a lean target value corresponding to lean operation, and using a second injection timing map configured to provide a rich target value corresponding to the engine operating condition for rich operation.
15. The engine fuel injection control apparatus as recited in claim 1, wherein
the fuel injection timing control section is configured to set the fuel injection timing and the fuel injection quantity of the fuel according to an injection valve opening timing and a fuel injection valve opening duration.
16. An engine fuel injection control apparatus for an engine comprising:
excess air ratio control means for controlling an excess air ratio to a target excess air ratio that is determined based on an engine operating condition of the engine;
fuel injection timing control means for controlling a fuel injection timing to a target fuel injection timing that is determined based on the engine operating condition;
actual excess air ratio computing means for computing an actual excess air ratio of the engine; and
fuel injection timing adjustment means for adjusting the fuel injection timing to obtain an adjusted fuel injection timing based on the actual excess air ratio that was computed when an amount of adjustment in the target excess air ratio is larger than a prescribed value.
17. A method for controlling a fuel injection system for an engine comprising:
controlling an excess air ratio to a target excess air ratio that is determined based on an engine operating condition of the engine;
controlling a fuel injection timing to a target fuel injection timing that is determined based on the engine operating condition;
computing an actual excess air ratio of the engine; and
adjusting the fuel injection timing to obtain an adjusted fuel injection timing based on the actual excess air ratio that was computed when an amount of adjustment in the target excess air ratio is larger than a prescribed value.
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 selling jewelry to a customer, the customer acting as a gift giver, the method comprising the steps of:
providing a selection of rough stones to a customer;
informing the customer about available options on cuts and sizes of stones that may be yielded from the selection of rough stones;
choosing, by the customer, a specific rough stone from the selection of rough stones based on a specific available option chosen by the customer;
cutting the specific rough stone into at least two cut stones as per the specific available option chosen by the customer, the at least two cut stones including a major stone and at least one remainder stone;
selling the cut stones to the customer;
presenting, by the customer, the cut stones to at least two recipients, whereby the customer and the recipients have a specific sentimental relationship, the cut stones yielded from the specific rough stone being symbolic of the sentimental relationship.
2. The method of selling jewelry as claimed in claim 1 wherein the customer and one of the recipients are same person.
3. The method of selling jewelry as claimed in claim 1 wherein the customer is a parent and the recipients are at least two children of the parent.
4. The method of selling jewelry as claimed in claim 1 wherein the customer is a grandparent and the recipients are at least two grandchildren of the grandparent.
5. The method of selling jewelry as claimed in claim 1 whereby the selection of rough stones have stones of different karat, color and clarity.
6. The method of selling jewelry as claimed in claim 1 further comprising the step of determining a cutting configuration for the specific rough stone.
7. The method of selling jewelry as claimed in claim 6 whereby the cutting configuration is any possible type of cut for a gemstone.
8. The method of claim 1 further comprising the step of: mounting the at least two stones to at least two pieces of jewelry, the pieces of jewelry being presented to the recipients.
9. The method of claim 2 wherein the specific sentimental relationship is husband and wife.
10. The method of claim 2 wherein the specific sentimental relationship is a life partner.
11. The method of claim 2 wherein the specific sentimental relationship is parent and child.
12. The method of claim 2 wherein the specific sentimental relationship is siblings.
13. The method of claim 2 wherein the specific sentimental relationship is persons engaged to be married.
14. The method of claim 1 wherein the step of providing a plurality of rough stones to a customer is presented over the Internet.
15. The method of claim 1 wherein the step of providing a plurality of rough stones to a customer is presented at a retail store.
16. The method of claim 1 wherein the step of providing a plurality of rough stones to a customer is presented in a catalogue.
17. The method of claim 1 wherein the specific rough stone is a diamond.
18. The method of claim 1 wherein the specific rough stone is a ruby.
19. The method of claim 1 wherein the specific rough stone is an emerald.
20. The method of claim 1 wherein the specific rough stone is a sapphire.