Generally, butterfly valve or lift in the carburetor and throttle body is actuated with the help of mechanical linkages connected to the throttle twist grip. According to our action given in the throttle twist grip, the amount of air flowing into the engine differs. In carburetor, butterfly valve or lift will be present. Those valves or lift will be actuated when we give input via the throttle twist grip. This will decide the amount of air and fuel mixture flowing into the engine. In case of fuel injected engine, the Throttle Position Sensor (TPS) will be present in the throttle body which tells the ECU to decide the amount of fuel to be injected for our throttle response. Generally, this throttle twist grip and valve in carburetor or throttle body is connected with the help of throttle cable and linkages. This is known as throttle cable system and this is what we see in smaller capacity engines and in daily commuters.
In this ride by wire system, the mechanical linkages are totally neglected and this system is applicable only for fuel injected motorbikes. Yamaha has implemented this system on their motorbike first in the year 2006. There'll be no physical wires. Its just pure utilization of sensors and actuators. In those days, manufacturers has used this system only in high performance oriented motorbikes. But now a days, we can able to see this system also in mid range performance oriented motorbikes.
Overview
As i said, in normal throttling system, a throttle cable will be present to lift the slide or to turn the butterfly valve. But here in this ride by wire mechanism, a angle position sensor will be present in the throttle twist grip. In the throttle body, the actuator will be present which is nothing but a servo motor and it is geared up and ready to actuate the butterfly valve present in the throttle body. This angle position sensor and the motor actuator is connected via the ECU which is known as brain of the motorbike. At one end of the butterfly valve, this motor actuator is present and on the other side, Throttle Position Sensor (TPS) will be present. This is the basic layout and let's now see the working.
Working
When rider gives the throttle input, the signal will be sent to the Electronic Control Unit or Module (ECU) from the throttle twist grip. This signal will be sent in the form of electrical voltage. The method used here is simple. In our 10th grade, we all have done the experiment on variable resistance potentiometer. The same principle is used here. After receiving the signal from angle position sensor present in the throttle, the ECU will look for the data which is already mapped in it. After going through the data, it sends signal to the actuator which is the motor. The motor will work according to the signal received from the ECU. It opens or close the butterfly valve present in the throttle body. Thus air required for the engine flows through that.
As i said, in the other end of the butterfly valve, a Throttle Position Sensor (TPS) will be present. Whenever the butterfly valve in the throttle body actuates, the TPS connected to it will also function together. The same principle used in the angle position sensor is also used in this TPS. Whenever rider twists the throttle, a signal will actuate the servo motor in the throttle body and this'll also make the TPS to function. TPS sends signal to the ECU thereby forming a closed loop system. After considering several other factors like intake air temperature, intake air pressure with the throttle position, the ECU actuates the fuel injector to inject the fuel according our throttle input. This data is also mapped in the ECU already. Thus air and fuel mixture flows into the combustion chamber, bangs and make the vehicle move forward. In normal throttling by wire system, we can able to see lag between our input and pickup of the engine. In this ride by wire system, this problem is totally neglected and we can get smooth and optimized throttle response.
Benefits
• Precise control of fuel air mixture
• Great throttle response
• Easy to integrate different riding modes
Disadvantages
• High cost
• Difficult to repair or replace
In this ride by wire system, the mechanical linkages are totally neglected and this system is applicable only for fuel injected motorbikes. Yamaha has implemented this system on their motorbike first in the year 2006. There'll be no physical wires. Its just pure utilization of sensors and actuators. In those days, manufacturers has used this system only in high performance oriented motorbikes. But now a days, we can able to see this system also in mid range performance oriented motorbikes.
Overview
As i said, in normal throttling system, a throttle cable will be present to lift the slide or to turn the butterfly valve. But here in this ride by wire mechanism, a angle position sensor will be present in the throttle twist grip. In the throttle body, the actuator will be present which is nothing but a servo motor and it is geared up and ready to actuate the butterfly valve present in the throttle body. This angle position sensor and the motor actuator is connected via the ECU which is known as brain of the motorbike. At one end of the butterfly valve, this motor actuator is present and on the other side, Throttle Position Sensor (TPS) will be present. This is the basic layout and let's now see the working.
Working
When rider gives the throttle input, the signal will be sent to the Electronic Control Unit or Module (ECU) from the throttle twist grip. This signal will be sent in the form of electrical voltage. The method used here is simple. In our 10th grade, we all have done the experiment on variable resistance potentiometer. The same principle is used here. After receiving the signal from angle position sensor present in the throttle, the ECU will look for the data which is already mapped in it. After going through the data, it sends signal to the actuator which is the motor. The motor will work according to the signal received from the ECU. It opens or close the butterfly valve present in the throttle body. Thus air required for the engine flows through that.
As i said, in the other end of the butterfly valve, a Throttle Position Sensor (TPS) will be present. Whenever the butterfly valve in the throttle body actuates, the TPS connected to it will also function together. The same principle used in the angle position sensor is also used in this TPS. Whenever rider twists the throttle, a signal will actuate the servo motor in the throttle body and this'll also make the TPS to function. TPS sends signal to the ECU thereby forming a closed loop system. After considering several other factors like intake air temperature, intake air pressure with the throttle position, the ECU actuates the fuel injector to inject the fuel according our throttle input. This data is also mapped in the ECU already. Thus air and fuel mixture flows into the combustion chamber, bangs and make the vehicle move forward. In normal throttling by wire system, we can able to see lag between our input and pickup of the engine. In this ride by wire system, this problem is totally neglected and we can get smooth and optimized throttle response.
Benefits
• Precise control of fuel air mixture
• Great throttle response
• Easy to integrate different riding modes
Disadvantages
• High cost
• Difficult to repair or replace
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