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

Example (7): Determine the heating surface area required for the production of 2.5kg/s of 50wt% NaOH solution from 15 wt% NaOH feed solution which entering at 100 oC to a single effect evaporator. The steam is available as saturated at 451.5K and the boiling point rise (boiling point evaluation) of 50wt% solution is 35K. the overall heat transfer coefficient is 2000 w/m²K. The pressure in the vapor space of the evaporator at atmospheric pressure. The solution has a specific heat of 4.18kJ/ kg.K. The enthalpy of vaporization under these condition is 2257kJ/kg Example (6): 5:48 م An evaporator is concentrating F kg/h at 311K of a 20wt% solution of NaOH to 50wt %. The saturated steam used for heating is at 399.3K. The pressure in the vapor space of the evaporator is 13.3 KPa abs. The 5:48 O

Design a speed warning system that receives on two lines, an indication of the speed limit on the highway. There are three possible values 45, 55, or 65 MPH. It receives from the automobile, on two other lines, an indication of the speed of the vehicle. There are four possible values under 45, between 46 and 55, between 56 and 65, and over 65 MPH. It produces two outputs. The first, F, indicates whether the car is going above the speed limit. The second, G, indicates that the car is driving at a "dangerous speed" _ defined as either over 65 MPH or more than 10 MPH above the speed limit. The inputs are coded as follows: Speed limit A B Speed C D 45 0 0 65 1 1 a) Complete the Truth table for the speed warning system Inputs Outputs A B C D F G b) Write the Minterm expressions for the Output Functions. c) Minimize the output functions d) Implement the logic e) Using LabView, verify the Correctness of the Speed Warning System.

Ex. The cantilever beam shown us, made ofrem steel with = 552 MPa is , ut subjected to fully reversed load. Neglect shear stress effect, estimate wheather the beam is safe or not safe at N= lo cycles 9 The beam is machined surface and the operating temp. is 100C. A F 200 a=0 N -200 N 1 L= 10cm D time 764 Yze.25 Gm L D= 1.3 cm d = 1 cm b= 1 cm -momend diagram AA -FL at the root of the cantilever, the bending moment is max. factor Ex. Repeat Ex. in page (24), with fluctuating load as shown below. By = 46242,041 = 552 MPa. Find the safety (NF) using Modified -Goodman, Gerber, and soderberg criterias F(N). ....400 time

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