MULTIPLE FUEL INJECTION CONTROL OPERATION [MZR-CD (RF Turbo)]
BME014000000T34
• The multiple fuel injection control has five injection patterns with varying injection frequencies. The PCM selects the optimum injection pattern according to vehicle conditions and performs injection a maximum of five times.
• The main injection is injected in order to secure engine performance.
• The pre-injection is injected in order to improve emission performance.
• The pilot injection is injected in order to reduce noise.
• The follow-up injection is injected in order to improve emission performance.
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1
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Crank angle standard position
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2
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TDC
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3
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CKP sensor signal
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4
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Injection pattern for five injections
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5
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Injection pattern for four injections
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6
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Injection pattern for three injections
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7
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Injection pattern for two injections
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8
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Injection pattern for one injection
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9
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Pilot injection
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10
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Pre-injection
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11
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Main injection
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12
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Follow-up injection
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Operating Condition
• The PCM determines the injection frequency based on the engine speed, fuel injection amount, and signals from each sensor.
• When the engine is started, the PCM calculates the injection frequency based on the engine coolant temperature and engine speed.