Fuel pressure control apparatus and method of internal combustion engine
First Claim
1. A fuel pressure control apparatus of an internal combustion engine, comprising:
- a fuel pump that ejects fuel toward a fuel delivery pipe; and
a controller that adjusts an amount of fuel ejection of the fuel pump by controlling a drive timing of the fuel pump, wherein the controller;
calculates a control amount to be used for controlling the drive timing of the fuel pump, based on a maximum ejection timing that provides a maximum amount of fuel ejection of the fuel pump; and
learns a drive timing of the fuel pump that provides the maximum amount of fuel ejection, as the maximum ejection timing.
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Accused Products
Abstract
The amount of fuel ejected from a high-pressure fuel pump that ejects fuel toward a delivery pipe is adjusted by controlling the valve closure start timing of an electromagnetic spill valve. In this manner, the fuel pressure in the delivery pipe is controlled. The duty ratio DT used for controlling the valve closure start timing of the electromagnetic spill valve is calculated based on a valve closure start timing that provides a maximum amount of fuel ejection. The actual fuel ejection characteristic of a high-pressure fuel pump may deviate from a designed state due to individual differences of the pump. However, the valve closure start timing of the electromagnetic spill valve that provides the maximum amount of fuel ejection in accordance with the actual fuel ejection characteristic is learned as a maximum ejection timing. Based on the maximum ejection timing, the duty ratio DT is calculated.
5 Citations
14 Claims
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1. A fuel pressure control apparatus of an internal combustion engine, comprising:
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a fuel pump that ejects fuel toward a fuel delivery pipe; and
a controller that adjusts an amount of fuel ejection of the fuel pump by controlling a drive timing of the fuel pump, wherein the controller;
calculates a control amount to be used for controlling the drive timing of the fuel pump, based on a maximum ejection timing that provides a maximum amount of fuel ejection of the fuel pump; and
learns a drive timing of the fuel pump that provides the maximum amount of fuel ejection, as the maximum ejection timing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fuel pressure control method for an internal combustion engine having a fuel pump that ejects fuel toward a fuel delivery pipe, comprising:
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learning a drive timing of the fuel pump that provides a maximum amount of fuel ejection, as a maximum ejection timing;
calculating a control amount to be used for controlling the drive timing of the fuel pump based on the maximum ejection timing; and
adjusting the amount of fuel ejection of the fuel pump by controlling the drive timing of the fuel pump based upon the calculated control amount. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification