Toyota has revealed the creation of a brand-new variable valve lift system. The automaker’s current VVT-i variable valve timing system is combined with a device that continuously regulates the intake valve lift volume in a system known as Valvematic.
Valvematic adjusts airflow volume dependent on the engine’s operating circumstances to help maximize performance and fuel efficiency. Toyota claims that the technology increases the new 2.0-liter engine’s fuel efficiency by 510%, boosts power by up to 10%, enhances acceleration, and lowers CO2 emissions.
The aforementioned 2.0-liter engine will debut soon on an as-yet-unnamed model and will be the first to be fitted with valvematic. Since the firm is preparing to completely redesign its gasoline and transmission lines, anticipate that every Toyota engine will have the system by 2010.
In This Article...
The valvematic system is what?
TokyoTOYOTA MOTOR CORPORATION (TMC) declared today that it has created Valvematic*, a variable valve lift mechanism, by combining VVT-i (Variable Valve Timing-intelligent), which continuously regulates the timing of the intake valve opening and closing, with a new mechanism that regulates the intake valve lift volume.
In contrast to conventional engines, which regulate air intake using a throttle valve, valvematic continually regulates the volume of intake valve lift and the timing of valve opening and shutting. This guarantees the best performance based on the engine’s operational state and aids in achieving great fuel efficiency and dynamic performance in automobiles.
According to driving conditions, a new 2.0-liter engine created by Toyota’s Valvematic technology improves fuel efficiency by 5% to 10%, lowers CO2 emissions, increases output by at least 10%, and improves acceleration response. TMC intends to launch Valvematic soon, beginning with a new car model equipped with a 2.0-liter engine.
In terms of its corporate social responsibility, TMC prioritizes efforts to protect the environment globally and toward energy diversification. TMC is to totally redesign its gasoline engine and transmission portfolio by 2010. This is part of its attempts to lower CO2 emissions through high fuel efficiency and to produce cleaner exhaust emissions.
A valvematic controller: what is it?
Below is a description of “Valvematic” (VM), a continuous variable valve lifting technology, in addition to an evaluation of ZR engines.
Intake valve lift can be adjusted using valvematic in the range of 0.9 to 10.9 mm. As a result, the range of the valve opening duration is 106..260. (crank angle).
Control of variable valve timing (VVT-i) and electronically controlled throttle are integral parts of VM management (ETCS-i).
The indication diagram (for idle and under 30% load) illustrates the variations between conventional and VM engines.
During VM operation, the throttle valve is almost continually kept in the fully open position in contrast to a traditional engine, and the mixture dosing is accomplished by adjusting valve lift.
Pumping losses are decreased on the piston down stroke in VM engines because the intake manifold pressure at the start of the intake stroke is nearly barometric.
The intake valve closes once the desired volume of the mixture has entered the cylinder. Vacuum in the cylinder causes pumping losses to rise even in VM engines as the piston continues to descend.
Although the vacuum in the cylinders of both engines is equal at the end of the piston stroke, the admission in the VM engine was carried out more successfully.
Advantages: Accurate timing and lifting control in line with driving conditions allows for the same output to be achieved with reduced usage.
Advantages: Valve timing control to increase output or improve efficiency depending on driving circumstances.
– Shortly after BDC, the intake valves close, reducing the overlap and boosting compression.
Toyota Valvematic: Is it trustworthy?
The 2007 introduction of Toyota’s Valvematic technology was intended to improve upon the company’s previous VVT-i variable valve timing system. The update included a brand-new system for regulating the volume of the intake valve lift. The ultimate objective of Toyota was to improve combustion efficiency and reduce fuel usage. The Valvematic system experienced some early growing pains, just like most new automotive technology.
The mechanical complexity of the system makes it more susceptible to failure than the prior VVT-i configuration. The Valvematic system is still generally regarded as being extremely reliable, but should something go wrong with it, a wide range of symptoms may manifest.
Failures of Valvematic systems are most frequently caused by concurrent problems with the 2ZR-FE water pump and turning while being severely bumped. Dirt in the intake manifold, which can be brought on by dislodged debris from striking hard potholes when cornering, has been connected to numerous valvematic problems.
Toyota 2ZR-FE Failing Valvematic System Symptoms
On the 1.8L inline-4 Toyota engine, a few signs of a Valvematic failure include:
- check-engine indicator
- noisy screaming sound
- Rusty Idle
- Engine sputters when under load or climbing a hill
A rough engine idle is typically the first indication of a failed Valvematic system. While there are various explanations for a rough idling engine, a valvematic problem is frequently to blame if the problem is also accompanied by trouble ascending steep slopes or misfiring under heavy load. As this form of failure is frequently associated with a failing or malfunctioning coolant pump, valvematic failure frequently warns itself with a loud screeching sound as well. The squeaking sound is brought on by coolant dripping onto revolving Valvematic components.
ZR-FE Valvematic Failure Repair
Again, this is extremely unlikely, but the only option if your 2ZR-FE Valvematic system should malfunction is a replacement. The fact that we are dealing with Toyota and not another manufacturer is advantageous to your wallet, just like with the previously mentioned problems. Your factory Toyota warranty also covers valvematic failure, so if your car is covered, getting a new valvematic won’t cost you anything. The most common quote for the repair for a vehicle that has passed its warranty is $700.
Is the Toyota VVT-i engine dependable?
Toyota makes it. Any Toyota already has a well-deserved reputation for being the absolute best in terms of dependability and toughness. It would be nitpicking to try to differentiate between these two variations, which are nearly identical. If you perform regular maintenance, a timing belt problem won’t arise.
You might also argue that because older vehicles often have more miles on them and are statistically more prone to fail.
The Land Cruisers are not the only vehicles with the VVTi system. It is present throughout the whole Toyota lineup and has established its value reliability in terms of power and fuel efficiency.
Consider the benefits: more overall power and efficiency. That shouldn’t be taken seriously for a large vehicle like the Land Cruiser. especially once you add armor, accessories, higher tires, and possibly a tow.
What does the symbol gd6 mean?
What Does GD-6 Stand For? – Trivia Global Diesel, or GD, refers to a new line of Toyota diesel engines. The 1GD-FTV is a 2.8L, straight-4, common rail diesel engine with a chain drive, intercooler, and variable nozzle turbocharger (VNT).
What distinguishes an EFI engine from a VVT-i engine?
EFI stands for fuel injection, which has been the norm since the early 1990s. Toyota’s variable valve timing (VVTI) engine architecture enables camshaft timing to be adjusted.
What causes the Toyota variable valve timing?
With variable valve timing, less air-fuel combination enters the engine during light acceleration or idle, resulting in a reduction in emissions. Because the valves are open for a longer period of time during heavy acceleration, the engine receives more air-fuel mixture, which boosts power.
With Toyota’s VVT-i, the “brain that regulates engine operations,” the electronic control unit, continuously determines the ideal time to open and close the valves and activates an oil pressure valve to vary the timing by changing camshaft speed.
Some Toyota engines, including the 3.5-liter V-6 in the Highlander SUV, use electric motors to adjust the intake valve timing. Toyota refers to these engines as VVT-iE engines (for Electric). The exhaust valves of engines like the 3.5-liter and 2.5-liter used in the Camry sedan also have variable timing, and they are referred to as Dual VVT-i. Toyota claims that VVT-i increases power, enhances fuel efficiency, and lowers pollutants by adjusting valve timing based on driving conditions.
Variable timing was originally made available by Alfa Romeo in 1980. Other automakers soon followed, including Honda in 1989 with its VTEC technology. VVT-i was first announced by Toyota in 1995 and debuted in the United States in the 1998 Lexus LS 400. The first Toyota model having it in the United States was the Celica, model year 2000.
All of the current Toyota vehicles sold in the US have VVT-i engines, with the exception of the 86 coupe, Supra sports car, and Mirai fuel-cell vehicle. Both the 86 and the Supra have variable valve timing and use Subaru or BMW engines, respectively.
What makes VVT and VVT-i different from one another?
The intake and exhaust valves in an automobile engine are moved by a camshaft. The configuration of the lobes that move the shaft determines the timing, lift, and duration of the valve. Lift describes how much a valve is opened, whereas timing describes the angle at which it is opened or closed in relation to the position of the piston.
While VVTi simply employs the timing aspect of the valves, i-VTEC uses both the timing and the lift aspect.
VVTL-i, a technique created by Toyota that uses timing and lift aspects, is comparable to Honda’s i-VTEC.
In 2001, Honda debuted i-VTEC technology to their four-cylinder K-series engine family. This technique allows
- Further torque output optimization results, particularly at low and middle RPM.
- When the engine is running, the intake camshaft might advance by 25 to 50 degrees.
- A computer-controlled, oil-driven adjustable cam gear implements phase changes.
- There are still only two separate low-RPM and high-RPM profiles for valve lift and duration.
- Phasing can be totally retarded at idle to considerably accelerated at full throttle and low RPM depending on the engine load and rpm.
- By altering the connection between the intake camshaft and camshaft drive (belt, scissor-gear, or chain), the timing of the intake valves can be changed.
- Engine efficiency is increased by adjusting the gap between the opening of the intake valve and the shutting of the exhaust valve.
- An actuator is subjected to engine oil pressure in order to change the camshaft position.
Describe Toyota VVT-i.
Techniquest Glyndr’s ZR engine with intelligent variable valve timing, shown in a cutaway view.
Toyota created the variable valve timing technology known as VVT-i, or variable valve timing with intelligence, for use in automobiles. The Toyota VVT-i system takes the place of the Toyota VVT, which was available on the 4A-GE engine’s 5-valve per cylinder starting in 1991. The VVT system is a two-stage cam phasing mechanism that is hydraulically regulated.
VVT-i, which debuted on the 2JZ-GE engine in 1995 for the JZS155 Toyota Crown and Crown Majesta, modifies the interaction between the intake camshaft and camshaft drive (a belt or chain). An actuator is subjected to engine oil pressure in order to change the camshaft position. Engine efficiency is increased by adjusting the gap between the opening of the intake valve and the shutting of the exhaust valve. [1] Subsequent variations of the system include included VVTL-i, Dual VVT-i, VVT-iE, VVT-iW, and Valvematic.