Device for controlling the ignition timing for internal combustion engines
A technology of ignition period and control device, applied in spark ignition controller, engine ignition, engine control and other directions, can solve problems such as damage to internal combustion engine, inability to detect knocking, ineffective control of internal combustion engine ignition period, etc., and achieve short-circuit fault to ground. simple effect
Inactive Publication Date: 2005-11-16
MITSUBISHI ELECTRIC CORP
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Problems solved by technology
Knocking detection is usually performed with a knocking sensor, but when the knocking sensor has a fault such as disconnection, knocking cannot be detected, and the control of the ignition period of the internal combustion engine does not work. As a result, the internal combustion engine may be damaged
Method used
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Embodiment Construction
[0023] Embodiment 1
[0024] Embodiment 1 of the present invention is shown in figure 1 . figure 1 Among them, the ignition timing control device for an internal combustion engine of the present invention includes a knock sensor 1 and a microcomputer 2 . The knock sensor 1 is composed of piezoelectric elements, for example, and detects the vibration generated by the engine, etc., and outputs it in the form of an electric signal. Therefore, as shown in the figure, it can be in the form of a capacitor composed of a signal that outputs the vibration signal Vi and a capacitance Co, etc. effect. The microcomputer 2 has the function of receiving the knock signal VH from the knock sensor 1 to calculate the ignition timing control signal, and sending an output to the igniter not shown in the figure; accepting the fault detection signal described later and judging the knock The function of shock sensor failure; and when fault detection is required, a fault detection execution signal...
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A device for controlling the ignition timing for internal combustion engines correctly detecting fault of a knocking sensor over the whole rotational range of the engine. The device for controlling the ignition timing takes out knocking signals and produces an ignition timing control signal relying upon the knocking signals, and comprises a knocking sensor 1 , a microcomputer 2 for producing a fault detection execution signal for executing the detection of fault of the knocking sensor and for applying a pulse voltage to the knocking sensor 1 relying upon the fault detection execution signal, comparison means 5 and 6 for comparing the charging voltage or discharging voltage of the knocking sensor 1 with two different threshold values, and logic means (NOR circuit) 7 for obtaining an OR of the outputs of the comparison means 5 and 6 . The microcomputer 2 finds the sum of pulse widths output by the logic means during the period of detecting the fault and judges the fault of the knocking sensor relying upon the sum that is found of the pulse widths.
Description
technical field [0001] The present invention relates to an ignition timing control device for an internal combustion engine. Background technique [0002] Devices are widely known for detecting knocking in internal combustion engines and for controlling the timing of the ignition based on the knocking signal. Knock detection is usually performed with a knock sensor, but when a malfunction such as a disconnection of the knock sensor occurs, knocking cannot be detected, and the ignition timing control of the internal combustion engine does not work, and as a result, the internal combustion engine may be damaged. Therefore, it is extremely important to detect the failure of the knock sensor. [0003] Patent Document 1 discloses an ignition timing control device for an internal combustion engine that detects a knock sensor failure. The purpose of this device is to detect the disconnection fault of the knock sensor using the piezoelectric element with high precision. It applies...
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IPC IPC(8): F02P5/15F02D45/00F02P5/152F02P5/153G01L23/22
CPCF02P5/1526G01L23/225Y02T10/46Y02T10/40F02P5/15
Inventor 出水昭阿部实
Owner MITSUBISHI ELECTRIC CORP