Question

I’m order to run on the Atkins cycle Toyota’s vvt-I system causes ___

Answer 1

ANSWER:

Major problem with the Atkinson cycle is that it have shorter power stroke and also delivers narrow RPM range. To solve the problem of this draw back one can use continuos variable transmission which keep the engine in optimal range and better driving experience

using vvti with atkinson cycle brings the advantage in the system as

• It maximizes the fuel efficiency by adjusting the intake valve timing

In order to use the Atkinson cycle with Toyota vvti system it cause the given points as

• Improvement in fuel economy
• Faster warm up due to retardation in ignition timing and raise in exhaust gas temperature
• System can change the valve timing within the range of 80 degrees
• Different valve operation is achieved with the Atkinson cycle in the different load conditions as cold startup, partial load condition, engine transition to the higher loads

Reason:

Thare are different points to explain all the points mentioned above and as given below one by one with the explaination of vvti

• Vvti is known as variable valve timing intelligent
• Atkinson cycle also having almost the same principle as the otto cycle as fat as working is concerned
• In atkinson cycle operation, intake valve remains open during the beginning of compression stroke
• Because of this some of the air fuel mixture is pushed out from the cylinder and again go back to intake manifold
• It actually reduces the power which is generated because there is less fuel avaialble for the combustion
• It also reduces the compression ratio while the expansion ratio remains same
• So because of this less work is expanded during the compression stroke and it increases the amount of work which is obtained from the combustion.
• Increase in efficiency occurs at the expense of power density per liter.