will recommend that the driver turn off the automobile completely and check the system for short circuits. Interlocks for safety The microcontroller will monitor the clutch switch, door interlock and the break switch to verify they are all SAT during the first initialization after the ignition key is turn on. If all are SAT condition, then the microcontroller will take inputs from the Voltage pedal and enable the motor drive electronics. There after the switch inputs are not active until a reset of the ignition switch. If the switches are UNSAT then the microcontroller keeps motor drive controls off until a SAT condition occurs. below is a sealed metal box that contains the sensor/motor electronics and the IGBT power switches attached to a heat sink with fans. A metal cover is located over the circuit card to help shield it from the EMI generated during the pulse width modulation motor switching. The fans will be controlled from the controller as mentioned above. Figure 44 Controller Black Box – Sensors & Thermal Control The design of the temperature monitoring and control is based upon the sensor selection. Whether the sensor is analog, digital or one-wire will determine the overall configuration and additional parts that might be required. shows a comparison between six temperature sensor devices. It can be easily decided that economically the TMP20 would be the best selection with the widest operating temperature range. Despite this factor the additional components for an analog to digital converter design would make up for its benefit. In terms of the best component to reduce the number of wires included in the wiring harness, from the rear of the vehicle to the controller in the front, would be the DS18S20/DS18B20. The only disadvantage of this component is that its relatively new technology that may not have a large number of application engineers that are able to assist in malfunctions. The final option is the TMP03 sensor which despite its high cost provides a reasonable temperature range and can be further interfaced due to its open collector output. This temperature sensor requires a 4.5 to 7 V input which can be regulated from the 12V battery. 16 - Temperature Sensor Comparison Part Input Number Type Temp. Voltage Output Cost LM335 Analog -40°C to +100°C 1.8V to 5.5V Voltage $1.35 TMP20 Analog -55°C to +130° 1.8V to 5.5V Voltage $0.87
will recommend that the driver turn off the automobile completely and check the system for short circuits. Interlocks for safety The microcontroller will monitor the clutch switch, door interlock and the break switch to verify they are all SAT during the first initialization after the ignition key is turn on. If all are SAT condition, then the microcontroller will take inputs from the Voltage pedal and enable the motor drive electronics. There after the switch inputs are not active until a reset of the ignition switch. If the switches are UNSAT then the microcontroller keeps motor drive controls off until a SAT condition occurs. below is a sealed metal box that contains the sensor/motor electronics and the IGBT power switches attached to a heat sink with fans. A metal cover is located over the circuit card to help shield it from the EMI generated during the pulse width modulation motor switching. The fans will be controlled from the controller as mentioned above. Figure 44 – Controller Black Box Sensors & Thermal Control The design of the temperature monitoring and control is based upon the sensor selection. Whether the sensor is analog, digital or one-wire will determine the overall configuration and additional parts that might be required. shows a comparison between six temperature sensor devices. It can be easily decided that economically the TMP20 would be the best selection with the widest operating temperature range. Despite this factor the additional components for an analog to digital converter design would make up for its benefit. In terms of the best component to reduce the number of wires included in the wiring harness, from the rear of the vehicle to the controller in the front, would be the DS18S20/DS18B20. The only disadvantage of this component is that its relatively new technology that may not have a large number of application engineers that are able to assist in malfunctions. The final option is the TMP03 sensor which despite its high cost provides a reasonable temperature range and can be further interfaced due to its open collector output. This temperature sensor requires a 4.5 to 7 V input which can be regulated from the 12V battery. 16 - Temperature Sensor Comparison Part Number Type Temp. Input Voltage Output Cost LM335 Analog -40°C to +100°C 1.8V to 5.5V Voltage $1.35 TMP20 Analog -55°C to +130° 1.8V to 5.5V Voltage $0.87
Electric%20Car%20Conversion%20Group%203%20SD1.docx