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For constant maximum pressure and heat input, the air standard efficiency of gas power cycle is in the order Diesel cycle, Dual cycle, Otto cycle.

If the temperature of intake air in I.C. engine is lowered, then its efficiency will increase.

Dual Cycle is a combination of Otto cycle and Diesel cycle.

Another name for dual cycle is mixed cycle.
It mainly consist of 4 process

Process 1-2 : Reversible Adiabatic compression

Process 2-3 : Constant Volume Heat Addition

Process 3-4 : Constant Pressure Heat Addition

Process 4-5 : Reversible Adiabatic Expansion

Process 5-1 : Constant Volume Heat Rejection.

Since, Dual Cycle is a combination of Otto cycle and Diesel cycle, so in Dual cycle, generally heat rejection takes place at constant volume.
It consists of the two isenthalpic (constant volume) process & two adiabatic process & one isobaric process (Constant volume).

Since, Dual Cycle is a combination of Otto cycle and Diesel cycle, so in Dual cycle, generally heat addition takes place first at constant volume then at constant pressure.

The thermal efficiency of a diesel engine on weak mixtures is higher.

The combustion in compression ignition engine is heterogeneous.

In Diesel cycle, heat addition takes place at constant pressure.

In a diesel engine, the fuel is ignited by heat resulting from compressing air that is supplied for combustion.
Diesel engine operates under diesel cycle.
In diesel engine fuel injector is used to inject fuel.

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