NISSAN LEAF – BRAKE SYSTEM 1. INTRODUCTION The Nissan Leaf is the electric car manufactured by the OEM Nissan. It is also called Venucia e30 in China. This car is hatchback with five doors. This car was first introduced in the year 2010 in Japan and USA. The latest model of Nissan Leaf in India is the 2016 model. According to the U.S Environmental Protection Agency (EPA) the latest model gives a range of 172 km whose battery capacity is 30 kWh. This range is obtained on full battery charge. Another variant of this vehicle is one with a smaller battery capacity. It is having a battery capacity of 24 kWh and gives a range of 135 km. This vehicle is basically front wheel drive and uses a front motor. The main features of Nissan Leaf are the 110 …show more content…
In case of disc brakes, when pressure is applied to the brake pedal the piston inside the master pedal gets pressed due force exerted by pushrod. Pressure builds up in the entire system. The fluid flows through the hydraulic line to the calipers. The pressure on the caliper piston inside calipers pushes the brake pads against the rotor. Friction is developed between pads and the rotor. Hence vehicle slows down. In case of drum brakes, there is a wheel cylinder with brake shoes which applies braking force to the brake pads. The Nissan Leaf is equipped with hydraulic regenerative brake system. When the brakes are applied, the energy is recaptured and it boosts Li-ion battery and works base on the battery …show more content…
The traction motor driven by the regenerative brake function as an alternator to convert the kinetic energy developed at the rotation of tires to the potential electric energy which would charge the Li-ion Battery. Working The following diagram explains the working of the Regenerative Braking System: When the driver applies the brake, the stroke sensor detects the operation of the brake and the EDIB calculates the braking force required and sends the signal to Vehicle Control Module (VCM) via control signals. The VCM in turn determines the regenerative braking force required and sends it to EDIB unit through control signals. Also, the traction motor acts as a generator to produce the regenerative braking. The EDIB now calculates the hydraulic braking force required based on the outputs from the VCM. Thus based on this calculated hydraulic braking force the motor inside the EDIB is activated to push the master cylinder piston and adjust the fluid pressure inside the master cylinder so that it matches with the target fluid pressure. The motor engages the piston and amplifies the friction brake's pressure (hydraulic pressure). Through optimum control of the friction brake's hydraulic pressure, the energy regeneration outcome is
A mousetrap-powered car is a vehicle that powers up and moves by the energy of a wound-up mousetrap’s spring. Its main components are the mousetrap, long metal rod, and the fishing line. In order to make the car work, the rod was wounded-up (wrapped) around the fishing line that had one end attached to the drive axle and the other end to the arm of the mousetrap, which pulls the snapper's lever arm closer to the drive axle. When the arms were released, the tension of the spring pulled the string off the axle. As a result, the fishing line string unraveled, causing the axle and the wheels to rotate, propelling the vehicle. There are various forms of energy that are involved with this car. First, it started off as potential (stored) energy that came from when the mousetrap was set by wounding the spring around the axle by the turning of the wheels, which caused the snapper’s lever arm to pull closer to the drive axle and the spring in the center was compressed. Since every action has an equal and opposite reaction, when the trap was released, most of the potential energy converted into kinetic (motion) energy, propelling the snapper arm forward. However, not all of the energy was converted into kinetic energy, as some of it was lost to the force of friction. Friction helped to spin the wheels and progress the car forward as when the string was pulled, friction between it and the axle caused the axle to rotate. In addition, the outside forces of friction caused the car to slow down and eventually come to a stop. Since energy cannot be destroyed, when the car came to a stop, the friction converted into thermal and heat energy.
Investigation of the Relationship Between Mass of a Vehicle and Its Stopping Distance Problem The problem to be investigated is "how does the mass of a vehicle affect its stopping distance when brakes are applied?" This problem is related to the conservation of energy and will be investigated through a trolley going down a ramp. A simple trolley will be used to represent the vehicle and weights attached to the rear of the trolley via a pulley system will act as the brakes. Throughout the experiment energy will be transferred into many forms but no energy will be lost or gained. As the trolley is raised it gains potential energy, when released down the ramp this energy is converted to kinetic energy.
Electric Cars Buying a car is usually going to be the first big purchase a person will make in their life. It is actually considered the second biggest purchase, right behind buying a house. Cars can now do things like park themselves and even drive themselves. Electric cars are also a thing that is getting a lot of attention, and studies show that they will be what dominate our streets and highways in the near future. Many people turn to electric cars because they are very efficient in our pockets.
When the Tesla Model S was first released, Consumer Reports named the Electric Vehicle (EV) the most remarkable auto ever tested. The consumer protection publication; that has been looking out for their readers since 1936; said that the Flagship vehicle from Elon Musk’s Motor Company, was essentially flawless. Its performance on the track and in safety testing was second to none. However, due to a drop in quality class; from average to below; the Tesla Model S has been removed from Consumer Reports’ Recommended List.
Nissan was the first company to introduce a 100 percent electric car that produces zero emission and they had great hopes for this vehicle (“Nissan Product Information”). According to Michael Strong, the company believed that this car would be the future of transportation and that it would soon be responsible for 10 percent of all new vehicle sales. However, after 3 years on the market, Nissan’s CEO Ghosn admitted that the Nissan Leaf is only accountable for 4...
A direct current in a set of windings creates a polar magnetic field. A torque acts on the rotor due to its relation to the external magnetic field. Just as the magnetic field of the rotor becomes fully aligned with the external magnetic field, the direction of the current in the windings on the armature reverses, thereby reversing the polarity of the rotor's electromagnetic field. A torque is once again exerted on the rotor, and it continues spinning.
The computer has a major role in determining on how much power the car needs from the electric motor. The electric motor gets the power back from a set of Nickel Metal Hydride batteries. The computer reclaims excess heat from the brakes and electric motor to...
...ads. The theory behind this is that a non-rotating tire has less traction than a spinning one. The ABS will allow the vehicle to stop faster than when the wheel is skidding and allow the driver to remain in control of the vehicle while it stops. With the technology today, there are sensors attached to the wheels to sense when one wheel is spinning at a different speed than another.
“Need to check traffic conditions? Or your email? You can visit the Internet from the driver’s seat of your car. Lost? Onstar will guide you to your destination. Tired? Hungry ? OnStar’s concierge service will handle hotel and restaurant reservations. Stranded? OnStar will contact the nearest tow truck service and send help to any location. Important phone call to make? Just call out the number and you’re connected, all at your fingertips twenty-four hours a day, three hundred and sixty-five days a year.”
I mentioned on the last page that we must stop the bike by turning its kinetic energy into friction. To do this, the brakes apply a force to the disk with pads. The force of this friction is equal to the total downward force (f) that the pads put on the disk(the pads are usually on each side of the disk and crush it between them) multiplied by the coefficient of friction(u).
ABS (Anti-lock Braking System) is a system which stops the wheels locking up into a skid when braking on slippery surfaces. It works by using a computer which monitors wheel speeds and drives pistons which alternatively increases and decrease brake pressure several time a second on individual wheels when it senses they are about to lock up.
In this case study I will be discussing advantages and disadvantages of electric cars. Electric cars are cars that are powered by electricity. Electric vehicles are an important part of cutting emissions and reducing global warming. The battery of an electric car stores electrical energy. The electric motor is coupled to the wheels through gears; it converts 59-60% of electrical energy into the wheels. The battery runs the motor which allows the car to move. Electric cars are necessary as they will save money, because electricity is cheaper than gas. Also electric vehicles will help reduce global warming and pollution. However, some people say that electric cars still have environmental costs. The electricity used to recharge EV batteries has to come from somewhere in the world, and now, most electricity is generated by burning fossil fuels. Although electric vehicles are classified as green cars, purists will not appreciate the toxicity of the batteries.
Environmentally Friendly Electric vehicles are today’s zero-emission vehicles. They have no tailpipes and emit no pollutants. Instead of gasoline from oil refineries, electric vehicles get their “fuel” from electric power stations. Although power plants using fossil fuels do have emissions, power plant emissions generated for electric vehicle use are typically much lower than emissions from the comparable use of gasoline-powered cars. For power plants using renewable energy sources like wind, solar and hydropower, no air pollution is created.
There is no doubt that electric cars are the most appealing from of transportation in the world. They provide two of the most important key points of good transportation: reliable and efficient. They are reliable due to their simplicity of their power trains and the advancement of technology they have. They are efficient because they don't use any gasoline and because their motors can pass the zero-emission standard. Even though they may seem like a boring form of transportation, they offer good features that help keep the Earth's air clean and they help reduce pollution.
Electrical motors function by converting electrical energy into mechanical energy by using the energy stored in the magnetic field (Sarma, 1981). The mechanical energy (torque) is produced when opposing magnetic fields try to lineup. Therefore, the center line of the north pole of a magnetic field is directly opposite to the centerline of the south pole from another magnetic field (Fitzgerald et al., 1981). The opposing magnetic fields in a motor are generated by two separate concentrically oriented components, the stator and a rotor (Figure 2-5).