Phase diagnosis method and apparatus
AssigneeWeichai Power Co., Ltd.
InventorsDawei Song, Xuebin Wang, Peng Huang
Life of this patent
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Abstract
A phase diagnosis method and apparatus. When it is verified that the location of an engine is valid, an oil injector performs spraying at a top center compression position; if no acceleration is detected after spraying, it indicates that a fault occurs; in order to detect whether it is a fault of phase deviation of the camshaft by 180 degrees, the oil sprayer performs spraying at the top center exhaust position and detects whether there is an acceleration; if an acceleration is detected, it indicates that the situation of the phase deviation of the camshaft by 180 degrees exists. In this way, the problem in the prior art of being unable to detect phase deviation when the phase of a camshaft is deviated by 180 degrees is solved.
Claims8
A phase diagnosis method, comprising:
- an injector performing injection at a TDC timing of a compression stroke, if it is detected that an engine position is valid;
- detecting whether an engine is accelerating based on a crankshaft signal detected by a crankshaft position sensor;
- the injector performing injection at the TDC timing of an exhaust stroke, if no acceleration is detected;
- detecting whether the engine is accelerating based on the crankshaft signal detected by the crankshaft position sensor;
- and
- determining camshaft phase deviation of 180 degrees based on a camshaft signal detected by a camshaft position sensor and the crankshaft signal detected by the crankshaft position sensor, if an acceleration is detected,
- wherein that the injector performing injection at the TDC timing of the exhaust stroke and detecting whether the engine is accelerating comprises:
- the injector performing injection at the TDC timing of the exhaust stroke;
- detecting whether the engine is accelerating;
- detecting whether a preset number of injections are reached by counting the injections by a second detecting unit, if no acceleration is detected;
- returning to execute the injector performing injection at the TDC timing of the exhaust stroke, if the preset number of injections are not reached;
- and
- ending the injection, if an acceleration is detected or the injector reaches the preset number of injections.
A phase diagnosis device, comprising:
- a first injector, configured to control an injector to perform injection at a TDC timing of an exhaust stroke if an engine position is detected to be valid;
- a first detector, configured to detect whether an engine is accelerating based on a crankshaft signal detected by a crankshaft position sensor;
- a second injector and detector, configured to control the injector to perform injection at the TDC timing of the exhaust stroke and detect whether the engine is accelerating;
- a deviation determinator, configured to indicate camshaft phase deviates 180 degrees based on a camshaft signal detected by a camshaft position sensor and the crankshaft signal detected by the crankshaft position sensor, if an acceleration is detected, and
- an alarm, configured to go off, if camshaft phase deviation of 180 degrees is detected.
Dependencies are inferred from the claim text.