Explain staged and continuously variable value timing systems.

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 12, Problem 1SA

Explain staged and continuously variable value timing systems.

Expert Solution & Answer

To determine

The explanation of staged and continuously variable valve timing systems.

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Students have asked these similar questions

Explain the function and operation of variable valve timing. (10 - 20 words)

Sketch and explain the valve and port timing diagrams

What are the suggestions to prevent the occurrence of failures in car clutch?

Answer 2

Textbook Question

Chapter 12, Problem 1SA

Explain staged and continuously variable value timing systems.

Expert Solution & Answer

To determine

The explanation of staged and continuously variable valve timing systems.

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 12, Problem 1SA

Explain staged and continuously variable value timing systems.

Expert Solution & Answer

To determine

The explanation of staged and continuously variable valve timing systems.

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 12, Problem 1SA

Explain staged and continuously variable value timing systems.

Expert Solution & Answer

To determine

The explanation of staged and continuously variable valve timing systems.

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

To determine

The explanation of staged and continuously variable valve timing systems.

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Answer 8

Expert Solution & Answer

To determine

The explanation of staged and continuously variable valve timing systems.

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

To determine

The explanation of staged and continuously variable valve timing systems.

Answer 12

Explanation of Solution

Staged variable valve timing:

Staged valve timing consists of a central camshaft, where the lobes push against the wall to open when the camshaft is rotated. Crankshaft provides input to drive cam. Both the valves can be opened when there is a single cam. In the case of two cams, one can be used for intake and the second cam is for exhaust.

Valve timing ideal value point changes with a change in rpm. It is related to engine performance and fuel efficiency.

It involves three cams with different timing and lifts profile.

Stage one- low speed.

Stage two- medium speed.

Stage three- high speed.

Example − Honda VTEC system.

Continuously variable valve timing:

Continuously variable valve timing camshaft is fitted with a phaser. It is mounted in place of timing pulley, sprocket, or gear. The principle of phaser is based on a helical gear set or vanes enclosed in a housing. When the engine is running, it helps in changing time from cam-shaft to crankshaft.

It can be electronically or hydraulic controlled.

Example − Toyota’s VVT-i system.

Answer 13

Ch. 12 - Explain staged and continuously variable value...Ch. 12 - Prob. 2SA Ch. 12 - Define valve margin.Ch. 12 - What usually causes warpage in an aluminum cylin...Ch. 12 - What are the two ways pushrods can be checked for...Ch. 12 - True False? Fiats MultiAir system relies on...Ch. 12 - True False? Camshaft straightness is checked using...Ch. 12 - Which of the following is not true of knurling? It...Ch. 12 - To allow the engine to run on the Atkinson cycle,...Ch. 12 - To ensure proper seating of the valve, the valve...

Explain staged and continuously variable value timing systems.

Concept explainers

Videos

Explanation of Solution

Want to see more full solutions like this?

Chapter 12 Solutions