Knock control system for internal combustion engine
First Claim
1. A knock control system for internal combustion engines comprising:
- knock vibration detecting means for detecting knocking vibration of an internal combustion engine;
knock deciding means including an analog-digital converter and a microcomputer for digitally deciding occurrence of knock in response to output signals of said knock vibration detecting means;
casing means mounted on said engine and encasing therein said knock vibration detecting means and said knock deciding means;
electrical connection means for electrically connecting said knock vibration detecting means and said knock deciding means within said casing means; and
connector means provided on said casing means for outputting therefrom knock information decided by said knock deciding means.
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Accused Products
Abstract
A knocking vibration detecting unit (1) and a knock deciding unit (c) are integrated, and the communications of a knock intensity between the knock deciding unit (c) and an engine controlling microcomputer (7) are carried out in combination of a change from the previous value of a signal line level. In the engine controlling microcomputer (7), the ignition timing is controlled by a predetermined retard angle in case of combination of no change of the present read signal line level from the previous signal line level.
Thus, an internal combustion engine is prevented from any damage by relieving a failure without fail when a signal line (10) is troubled, while minimizing the influences of noises and reducing the space and size of an ECU.
22 Citations
20 Claims
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1. A knock control system for internal combustion engines comprising:
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knock vibration detecting means for detecting knocking vibration of an internal combustion engine; knock deciding means including an analog-digital converter and a microcomputer for digitally deciding occurrence of knock in response to output signals of said knock vibration detecting means; casing means mounted on said engine and encasing therein said knock vibration detecting means and said knock deciding means; electrical connection means for electrically connecting said knock vibration detecting means and said knock deciding means within said casing means; and connector means provided on said casing means for outputting therefrom knock information decided by said knock deciding means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A knock control system for an internal combustion engine, comprising:
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knock deciding means having integrally packaged therein a knocking vibration detecting unit for detecting a knocking vibration in an internal combustion engine, and a knock deciding unit for deciding a knock on the basis of an output signal of said knocking vibration detecting unit; and knock control means made separate from said knock deciding means and communicating through a signal line with said knock deciding means for controlling the internal combustion engine on the basis of the decided knock result of said knock deciding means, wherein said knock deciding unit includes; intensity detecting means for detecting the intensity of the knocking from the output signal of said knocking vibration detecting unit; and knocking intensity outputting means for outputting the knocking intensity from said intensity detecting means to said knock control means in combination with the change of the level of said signal line to the previous signal line level, and wherein said knock control means includes; knocking intensity reading means for reading the signal line level outputted from said outputting means; memory means for storing the signal line level read by said reading means; knocking intensity restoring means for restoring the knocking intensity in combination of the change in the signal line level just read, to the previous signal line level stored in said memory means; control means for controlling an ignition timing in accordance with the restored result; and auxiliary control means for controlling the ignition timing to a predetermined retard angle in case of a combination in which said read signal line level is unchanged from said previous signal line level. - View Dependent Claims (11, 12, 19)
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13. A knock control system for an internal combustion engine, comprising:
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knock deciding means having integrally packaged therein a knocking vibration detecting unit for detecting a knocking vibration to be established in an internal combustion engine, and a knock deciding unit for deciding a knock on the basis of an output signal of said knocking vibration detecting unit; and knock control means made separate from said knock deciding means and communicating through a signal line with said knock deciding means for controlling the internal combustion engine on the basis of the decided knock result of said knock deciding means, wherein said knock deciding means includes; A/D conversion means for converting an analog output into a digital output; selection means for outputting a plurality of input signals selectively to said A/D conversion means; a set of series resistors connected on one side with a power supply and on the other with the ground and further connected at a plurality of portions thereof with the input of said selection means; parameter setting means for setting a parameter relating to a knock decision in accordance with the digital value which is read by said A/D conversion means through said selection means from one of voltage values different depending upon the positions of connection with said set of series resistors; intensity detecting means for detecting the intensity of the knock from the output signal of said knocking vibration detecting unit; and knocking intensity outputting means for outputting the knocking intensity from said intensity detecting means to said knock control means, and wherein said knock control means includes; knocking intensity reading means for reading the knocking intensity outputted from said knocking intensity outputting means; and control means for controlling an ignition timing in accordance with the read result. - View Dependent Claims (20)
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14. A knock control system for an internal combustion engine, comprising:
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knock deciding means having integrally packaged therein a knocking vibration detecting unit for detecting a knocking vibration in an internal combustion engine, and a knock deciding unit for deciding a knock on the basis of an output signal of said knocking vibration detecting unit; and knock control means made separate from said knock deciding means and communicating through a signal line with said knock deciding means for controlling the internal combustion engine on the basis of the decided knock result of said knock deciding means, wherein said knock deciding means includes; A/D conversion means for converting an analog output into a digital output; selection means for outputting a plurality of input signals selectively to said A/D conversion means; a set of individually series-connected resistors connected on one side with a power supply and on the other with the ground and further connected at the individual voltage-divided points thereof with the input of said selection means; parameter setting means for setting a parameter relating to a knock decision in accordance with the digital value which is read by said A/D conversion means through said selection means from one of voltage values different depending upon the resistances of said set of series resistors; intensity detecting means for detecting the intensity of the knock from the output signal of said knocking vibration detecting unit; and knocking intensity outputting means for outputting the knocking intensity from said intensity detecting means to said knock control means, and wherein said knock control means includes; knocking intensity reading means for reading the knocking intensity outputted from said knocking intensity outputting means; and control means for controlling an ignition timing in accordance with the read result. - View Dependent Claims (15, 16, 17, 18)
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Specification