Very well, I see you’ve made progress on the topic, so I’ll try to help you where I can. As I mentioned before, I dedicated a lot of time to this, and in one of my vehicles, I installed an alarm that locks the doors, along with an interface that closes the windows, and another for remote start. I will try to clarify your concerns.
For automatic window closing, you would have to consider that if it is an original system, they lose power when the car is turned off, so that would have to be resolved.
No problem, a bypass is done with relays powered independently of the original system.
Apart from a safety system to prevent your hand from being crushed when the windows are closing for whatever reason, like a child putting their hand in.
This part I had already thought about, and it is already used in many vehicles with original systems. For now, I can think of: 1.- Using current sensors like the ACS712 or similar to detect when the current consumption increases, so if someone puts their hand in, the window stops and returns a little. Something simpler is to put a reed-switch near the power cable of the motor (wound around it so that it generates a magnetic field when the current rises and activates the reed). For this, a H-bridge must be used to reverse the motor’s rotation. The limit switch can be detected with a Hall effect sensor.
To block the start, the most common thing used is a normally connected relay, which when trying to start the vehicle, disconnects the power supply to the coils that give the spark to the engine.
Exactly as you indicate… this is no major problem.
For remote start, in my case, I could not do it because my vehicle has a transponder in the key that if it is not in the switch, it is impossible to start it.
This also has a simpler solution than you imagine, but it has the disadvantage that it removes the security provided by the transponder (the system would somehow no longer work).
Now another thing is that it stops cranking once the engine has started.
This you mention can be done in 2 ways: 1.- When pressing the start button, the ignition is activated and the starter motor only works while you have the button pressed. 2.- When pressing the button, you activate the ignition and the starter motor works for a set time (for example, 30 seconds), if before that time the engine starts, the starter cuts off. To know when the engine has started, you can use the alternator signal, or you can measure the revolutions, this signal can be taken from the distributor, from the ignition coil, from the crankshaft sensor (CKP) or from the camshaft position sensor (CMP) depending on the case.
To be able to start the car remotely, being manual, a sensor would have to be placed on the clutch to start it, and remote start I don’t like the idea much because for whatever reason you leave the car in gear and not in neutral, an accident could occur.
Here you are right, that is why it is more recommended to use it only in automatic vehicles. That does not mean that a safe system cannot be made, it is only a matter of making a system that detects the position of the lever in neutral and also validates that the parking brake is well applied.
Another thing, I see that you use transistors for the door and trunk switches, I think they are unnecessary, it is only a matter of connecting them in pull-up mode since most vehicles work with negative.
I have to tell you that I have a mechanic workshop, so as far as any vehicle system is concerned, I have no problem and for the technical information or diagrams, we are not going to suffer, I have plenty, so whatever can be offered, do not hesitate to ask. Well, I’ll say goodbye because the post got a bit long. Regards.
Conclusion
This discussion highlights key considerations when implementing remote car start systems and other vehicle automation projects. While the original conversation doesn’t specifically mention “Encendido De Carro Via Obd2” (remote car start via OBD2), the concepts discussed are relevant to anyone exploring vehicle customization and security. Integrating systems like remote start requires careful attention to vehicle electronics, security features like transponders, and safety mechanisms to prevent accidents. For those interested in advanced vehicle modifications, understanding the intricacies of car electrical systems and potentially utilizing interfaces like the OBD2 port for diagnostics or control is crucial. Always prioritize safety and consult with experienced professionals when undertaking such projects.
