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Questions tagged [automotive]

An application field of electronics that requires high reliability and fail-safe systems. Application can vary widely in temperature ranges and a wide voltage range, typically 12v (or 24v) while off and higher when on.

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2answers
87 views

Why does the MIT Racecar not use the build in ESC?

MIT has build an autonomous RC race car. They put everything on GitHub. I have a similar project and therefor build one of those for my self (Almost the same but without TX1 and Sensors). I am ...
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0answers
32 views

150 A 12 - 16 V DC Short Circuit Protection

I am powering a ROV from a 4S LiPo battery (12.0 V minimum, 16.8 V maximum). The resistance of the battery is 36 mΩ, so that a maximum current of 470 A can flow through a short-circuit. In order to ...
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0answers
21 views

Automotive 12V Analog and Digital input coupling and isolation

There are numerous questions on SE about classical automotive signal adaptation to microcontrollers. The circuit below uses a few common techniques for analog signal interfacing when a ...
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2answers
70 views

Reliability of STM HAL driver For Safety Critical Application

I'm working on a project which must be used in an automotive application and act as a node into the multiplex CAN-BUS network. There are number of I/O that must be actuated and some of them had a ...
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1answer
68 views

Why are automotive connectors and wires so big?

Cars and motorcycles have many electronic sensors which are small. But it seems they are all connected with big connectors and at least 22AWG wires. Why? I would think 30AWG wires and tiny connectors ...
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2k views

Solar Charging Car Battery through Cigarette Lighter Outlet? [migrated]

My vehicle's cigarette lighter outlet is limited to 10 amps output. If charging were limited to less than 10 amps, would solar panel -> charge controller -> cigarette lighter outlet work for charging ...
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0answers
29 views

Switching between two connections - adding LEDs to car reversing light circuit

I am doing a DIY project on my car and need some help. I have 2 LED COB on the back of the car, which is to be used for 2 different things: If I put the car into reverse gear, then the LED comes on ...
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0answers
43 views

Cycle time / transmission cycle in short range automotive radar

I am somewhat newbie in the radar field. I am reading SRR20X-datasheet from Continental. I have two question. What are definitions of Cycle time/transmission cycle (second page)? And in the document,...
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1answer
67 views

Operating relay above coil voltage

I want to power some accessories in my car using illuminated switches on the dashboard. These switches will be wired to the dash illumination circuit, which is normally 12V but can drop as low as 6V ...
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1answer
59 views

Override One Lamp in a Four-Lamp Circuit Using Transistor?

simulate this circuit – Schematic created using CircuitLab I have a circuit of 4 light bulbs, with single switch on the positive terminal that will turn all the 4 bulbs at once. EDIT: Light ...
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1answer
51 views

Best way to shift automotive logic to Arduino TTL

My vehicle ignition switch voltage is 9V when the vehicle is not running. It is 6V when button is pressed. I need a way to convert this to TTL Arduino digital logic levels. I thought I could use a ...
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29 views

Interference on car bluetooth system

I just did some work on my car audio system and am having some problems with interference. I added a bluetooth receiver and wired it directly to my stereo cd player input. The receiver is powered from ...
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2answers
119 views

How to calculate bus load of CAN bus?

I have a few questions regarding CAN bus load Is there any derived equation/formula to calculate the bus load? I need transmit below frames(Assume Standard frame format) at baud rate 500 kbps on the ...
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0answers
46 views

Simple circuit to sense current drop and apply current to a separate circuit? Trouble with backup dashcam triggering from taillight

Sorry I have very little knowledge of EE but I feel like there must be a simple solution to this. I purchased a mirror dashcam with backup camera function. Backup camera is supposed to be triggered ...
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0answers
49 views

Connecting the secondary side of ignition coil to earth

I have an ignition system used for some application. During the testing I found that spark plug is producing EMI due to spark occurrence and high voltage is traveling through the wire. So to ...
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0answers
40 views

Name the connector - Automotive - Turn signal lever

This part is from a car's turn signal lever. The simple circuit has some interesting stuff - like carbon contacts to interface the arm with PCB. Also the connector - this is the first time I see this. ...
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2answers
51 views

Questions on CAN bit stuffing

I am new to the CAN. I have came across bit stuffing which is used to ensure that all receivers nodes are synchronized to transmitter node (After 5 bits of the same polarity, CAN will add a bit ...
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1answer
30 views

Battery free TPMS

I am doing a report about wireless TPMS, and I heard about products where the sensors in the valves do not need batteries at all (operate and transmit the data). Is that correct?? have you encountered ...
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3answers
56 views

Variable Current Draw from motor for torque control [closed]

I am building an electric go-kart. I would like to use regenerative braking. I would like to have a brake pedal that controls the amount of torque (slowing the motor and wheels down) that the back emf ...
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0answers
41 views

DIY Aux In connection to car stereo JVC KD-G151

I would like to connect my phone via jack cable (aux in) to my car stereo, which has no aux input (brand: JVC KD-G151). It is a CD player, so i wrote a silent disk to operate the cd player, and tried ...
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2answers
94 views

Count car weels without using visible light (camera/laser etc) and without interaction [closed]

For this project we need to count weels of a car (if possible at all), one side only. The scenario is within the following scope: The car is always passing in a straight line It is cars only, so all ...
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0answers
36 views

Choosing an Automotive Fuse with ISO 7637-2 (Pulse #1 24v system) in mind … -600v Transient

In designing a input power protection circuit in an automotive application with a 24V power bus, how does one deal with the -600V transient described in ISO 7637-2 Pulse #1: In particular, I'm ...
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0answers
40 views

Automotive connectors for interior use

I have a custom fuel injection project. Rather than place the electronics under the hood, I intend to have the ECU mounted inside the vehicle. This brings up some questions. First, is a sealed ...
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1answer
36 views

Identifying VW head-unit connector types

I've kind of been on a long quest to build an embedded system for working with the head unit of my '04 VW Golf. Others have done some work to detail pin-outs and write source code to send signals to ...
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2answers
259 views

Automotive load dump protection with TVS diodes

In this marketing material by Littlefuse they explain how to use e.g. their TPSMA6L TVS diode for automotive load dump protection: TVS Diodes can provide secondary transient voltage protection ...
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3answers
108 views

Alternator current when charging flat battery

I've found some voltage-current-rpm graphs for car alternators and did not quite understand one thing. Basically, my alternator is rated at 75A (small car), which it should output above 2000 RPM or so....
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3answers
80 views

Sensor damage, ground loop or something else?

We are testing an capacitive fuel level sensor in field. Its mounted on top of a heavy construction vehicle (colmar) with a 24v battery system. Our sensor runs for few weeks and damages. Every time a ...
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1answer
58 views

Automotive power steering unit connector identification

I would like to request some help to identify the following connector (at least the manufacturer and connector family type): located inside the Toyota Camry 2018 Hybrid Power Steering Rack Pinion (...
0
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1answer
94 views

I need help to solve my melting switch problem [closed]

I have used a 20A 12VDC switch which by-passes my air-conditioning climate switch in the car which is not functioning, and yes... The 20A melted. My car battery is 12V. I have a glass fuse installed ...
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0answers
33 views

Drive 12v 40a relay with peak 3.3v pulse

I bought a Viper 5806v keyless entry/alarm for my car recently. My car uses a reverse polarity mechanism for door locks. It is not nessacery to install like this, just shorting the lock/unlock wire to ...
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1answer
130 views

12v relay latching until no power [duplicate]

So I'm awaiting to wire in one or two relays so that a circuit is not powered until a push button is pressed. Then the circuit remains powered until total power is turned off. I've been trying to ...
0
votes
1answer
28 views

Powering dual 5VDC, 2.4A USB ports via a switch in vehicle

I have an illuminated 2 port usb charger that plugs into a cigarette lighter/accessory socket in a car. The face of the charger is flat and sits flush when inserted into the cigarette lighter/...
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0answers
43 views

UDS message (OBD related)

I write this question to try to understand how these automotive standards interface in the 7 level of the OSI Model. If my vehicle implements both, then in level 7 of the communication, each message (...
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0answers
60 views

Autofeel light bar mod [duplicate]

I purchased an Autofeel 30 inch light bar that has 4 rows of LEDs. I have seen this bar advertised under a number of different names, but as far as I know it's the only one with 4 rows of LEDs (they ...
0
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0answers
182 views

Why don't electric car manufacturers use multiple chargers to handle high current charging?

I just read an article describing the multiple problems which occur when you're trying to increase the electric current transmitted through an cable to charge the battery of an electric car. These ...
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0answers
40 views

Delay timer for car bar light to stop mode cycling

I just brought a bar light for my vehicle. My problem is the light has 4 modes (white, white flashing , yellow, yellow flashing) and the modes are triggered by turning the light off then on in less ...
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2answers
91 views

OBDII Car-Hacking

Can I implement an OBD-II scanner using an ATMEGA328P in place of the ELM 327? Preferably read some diagnostics code and upload that data to a web app via mqtt using GSM module.
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1answer
130 views

PCB connector identification

appreciate if anyone is able to help to identify this connector in the photo below. Basically i am trying to identify different types of connectors/ports around different PCB to find debug ports. ...
0
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1answer
76 views

Can car alternator back-emf damage electronics?

I know on startup a motor or generator produces back-emf and current ( correct me if I'm wrong, been a while since I've worked with electric machinery ). Thus, it'd be reasonable to expect that when ...
0
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1answer
62 views

Diodes needed (parts) for OR gate automotive relay circuit

I need to power up a make-or-break simple automotive relay (4pin, 40A 12V) via an OR gate. OR gate as follows: Source 1 is the cable that provides +12V to activate car dome light which I will tap ...
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1answer
45 views

Powering a Behringer MicroMIX MX400 - Car Audio Application [closed]

I am installing a car audio system that will have TWO aux inputs; one in the dash and one in the rear passanger seat are. I decided to purchase the Behringer MicroMIX MX400 mixer. The power spec for ...
0
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1answer
33 views

TWO 3.5mm AUX sockets to ONE 3.5 AUX plug - Car Audio Application

I am putting together a car audio system and replacing the factory stereo with a new aftermarket head unit that has a single aux input. The vehicle comes with a single OEM aux input jack in the dash. ...
0
votes
1answer
50 views

High side driver internal design

I have a question about the high side driver VN7016AJ for automotive applications, during ISO pulse1 -150 V will be applied at its VCC pin, I found from the User manual (UM1922) that when -150 V is ...
0
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1answer
31 views

Connector identification (multipin connector for automotive touchscreen)

This connector is from a device connected to the touch screen in the car. This device is chinese, so I'm having trouble locating information about any part number or name. The connector has 4 wires ...
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1answer
145 views

How many horsepower does an alternator take from an engine at different speeds? [closed]

I want to know how much horsepower the engine deliver to the alternator at idle rpm,normal rpm and maximum rpm
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1answer
55 views

How short circuit is made when connecting negative cable first when jumping start the vehicle

When Jumping start, I understand that I need to connect the positive terminal first due to the safety reason. And also if I connect negative terminal first and touching the body of the vehicle with ...
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5answers
180 views

Can I derive steering wheel angle of a car from gyroscope data (x,y,z values)? [closed]

I am not an electrical engineer but I don't really know where to ask this question so here it is. I have some x,y,z gyroscope data from a car and I want to calculate the steering wheel angle at a ...
1
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1answer
60 views

What is the use of series resistor in VBAT line of CAN transceiver?

In the application diagram CAN Transceiver TJA1043 (Page – 19), there is a series resistor in the VBAT line. What is the use of this resistor? How to select the value for this resistor?
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0answers
54 views

Using a Small Signal Relay in Automotive Application

I want to implement a 12V relay (https://www.mouser.com/ProductDetail/Panasonic-Industrial-Devices/TX2SA-12V?qs=HLLy2pIPwuuBcCVwky7PWw%3D%3D) in an automotive application. I will be using the car's ...
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2answers
72 views

Swap between two colors without an additional light?

A Quick Note I'm not sure of a more accurate name for this question. If you can think of a better name, feel free to edit and change the name. Also, I'm not the greatest with technical terminology so ...