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US 4,899,711 AGranted
Engine knock control system
AssigneeMazda Motor Corporation
InventorsYoshitaka Tabara, Tetsuro Takaba, Tomotsugu Rikitake
Life of this patent
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Abstract
Oscillation of the engine is detected by an oscillation sensor which outputs a signal representing the oscillation of the engine. The maximum value of the output of the oscillation sensor during combustion period in each cycle is detected. The maximum values obtained in a predetermined number of cycles are stored in a memory and knock occurrence is determined on the basis of the predetermined number of maximum values output from the memory.
Claims7
An engine knock detecting system comprising
- an oscillation sensor which is mounted on an engine to detect oscillation of the engine and outputs a signal representing the oscillation of the engine,
- a maximum value detecting means which detects the maximum value of the output of the oscillation sensor at least during combustion period in each cycle,
- a memory means which receives the output of the maximum value detecting means and stores frequency of a plurality of maximum values by which the respective maximum values are detected in a predetermined number of cycles, and
- a determining means which determines knock occurrence on the basis of the maximum value which is detected most frequently.
1 more element
An engine knock control system comprising
- an oscillation sensor which is mounted on an engine to detect oscillation of the engine and outputs a signal representing the oscillation of the engine,
- a maximum value detecting means which detects the maximum value of the output of the oscillation sensor at least during combustion period in each cycle,
- a determining means which receives the output of the maximum value detecting means and determines knock occurrence on the basis of the maximum value which is detected most frequently,
- an operating condition detecting means which detects the operating condition of the engine and outputs a signal representing the engine operating condition,
- a basic control variable determining means which receives the output of the operating condition detecting means and determines a basic control variable for at least one control factor governing combustion in the engine, and
- a correction means which receives the output of the determining means and corrects the output of the basic control variable determining means to suppress knock upon knock occurrence.
3 more elements
Dependencies are inferred from the claim text.