Internal combustion engine ignition device
AssigneeMitsubishi Electric Corporation
InventorsFutoshi Aida, Yukio Yasuda, Yusuke Naruse
Life of this patent
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Abstract
An internal combustion engine ignition device is provided in which an ECU (200) includes a pulse generation circuit (201) that outputs pulse signals (Igt1 and Igt2) and an ion-signal detection/control circuit (300), and a coil driver (400) includes a pulse detection circuit (7) that recognizes a signal received from the pulse generation circuit (201) and an ion-current detection circuit (9); when the pulse signals are not outputted, an ion current is detected and a signal is outputted at the same line as a coil-driver input signal line.
Claims7
An internal combustion engine ignition device including an ignition coil having a primary coil and a secondary coil and a switching element that generates an ignition high voltage across the secondary coil of the ignition coil by flowing and interrupting a primary-coil current of the ignition coil, the internal combustion engine ignition device comprising:
- an ECU (electronic control unit) including a pulse generation circuit that supplies a coil-driver input signal line with a single pulse signal having an extremely short duration or a plurality of pulse signals, as an energization start signal Igt1 or a de-energization signal Igt2;
- a pulse detection circuit that stores the energization start signal and the de-energization signal, that recognizes the single pulse signal or the plurality of pulse signals, received by way of the coil-driver input signal line from the pulse generation circuit, as the energization start signal or the de-energization signal, and that supplies an ignition signal to the switching element;
- an ion bias circuit that is connected to a low-voltage side of the secondary coil and generates an ion current;
- an ion-current detection circuit that detects an ion current flowing through the secondary coil;
- an ion-current output circuit that outputs an ion signal at the coil-driver input signal line, based on an output signal of the ion-current detection circuit;
- and
- an ion-signal detection/control circuit that is included in the ECU and that detects and controls an output signal of the ion-current output circuit,
- wherein, at a timing when the pulse generation circuit outputs neither the energization start signal nor the de-energization signal, the ion-signal detection/control circuit sets an input voltage Igt of a coil driver to a high level, and at a timing when the pulse generation circuit outputs the energization start signal or the de-energization signal, the input voltage Igt of the coil driver is lowered for an extremely short time from the high level to a low level, so that the pulse detection circuit recognizes the change in the input voltage Igt as the energization start signal or the de-energization signal and supplies an ignition signal to the switching element, and
- wherein, at a timing except the timing when the energization start signal and the de-energization signal is supplied to the pulse detection circuit, the ion-current output circuit outputs an ion signal at the coil-driver input signal line, based on an ion current detected by the ion-current detection circuit.
An internal combustion engine ignition device including an ignition coil having a primary coil and a secondary coil and a switching element that generates an ignition high voltage across the secondary coil of the ignition coil by flowing and interrupting a primary-coil current of the ignition coil, the internal combustion engine ignition device comprising:
- an ECU (electronic control unit) including a pulse generation circuit that supplies a coil-driver input signal line with a single pulse signal having an extremely short. duration or a plurality of pulse signals, as an energization start signal Igt1 or a de-energization signal Igt2;
- a pulse detection circuit that stores the energization start signal and the de-energization signal, recognizes the single pulse signal or the plurality of pulse signals, received by way of the coil-driver input signal line from the pulse generation circuit, as the energization start signal or the de-energization signal, and supplies an ignition signal to the switching element;
- a coil-output-signal detection circuit that detects a signal outputted from the ignition coil and outputs at the coil-driver input signal line an output signal as a failure diagnosis signal, based on the detected signal;
- and
- a coil-output-signal detection/control circuit that is included in the ECU and that detects and controls the output signal of the coil-output-signal detection circuit,
- wherein, at a timing when the pulse generation circuit outputs neither the energization start signal nor the de-energization signal, the coil-output-signal detection/control circuit sets an input voltage Igt of a coil driver to a high level, and at a timing when the pulse generation circuit outputs the energization start signal or the de-energization signal, the input voltage Igt of the coil driver is lowered for an extremely short time from the high level to a low level, so that the pulse detection circuit recognizes the input voltage Igt as the energization start signal or the de-energization signal and supplies an ignition signal to the switching element, and
- wherein, at a timing except the timing when the energization start signal and the de-energization signal is supplied to the pulse detection circuit, the coil-output-signal detection circuit detects a signal outputted from the ignition coil and outputs at the coil-driver input signal line an output signal as a failure diagnosis signal.
Dependencies are inferred from the claim text.