Where is the Hyundai Rena 1 4 knock sensor

Detect engine knocking to suppress the occurrence of knocking phenomena. When the engineer adjusts the knock sensor, the vibration pattern of the knock is written into the electronic control unit. If the knock sensor detects a vibration pattern, the ECU determines the engine knock and then delays the ignition advance angle.

Currently, advanced knock sensors can even tell which cylinder is knocking and delay the ignition advance angle of that cylinder separately. 

The knock sensor is mounted in the middle of the engine block. For example, a four-cylinder engine is installed between cylinders 2 and 3, or one between cylinders 1 and 2 and one between cylinders 3 and 4. It is used to measure engine shake and adjust the ignition advance angle in case of engine knocking.

Usually piezoelectric ceramics. When the engine vibrates, the ceramic inside is squeezed to produce an electrical signal. Because this electrical signal is very weak, the connecting wires of ordinary knock sensors are wrapped with shielded wires.

Knock sensors are AC signal generators, but they are very different from most other AC signal generators in cars. In addition to detecting the speed and position of rotating shafts like magnetoelectric crankshaft and camshaft position sensors, they also detect vibration or mechanical pressure. Unlike stators and magnetoresistors, they are typically piezoelectric devices.

They are made of special materials that can sense mechanical pressure or vibration (for example, when the engine starts knocking, it can generate alternating voltage).

Engine damage can occur due to premature ignition, poor exhaust gas recirculation, and engine knocking caused by low-quality fuel. The knock sensor provides a knock signal to the computer, prompting the computer to readjust the ignition timing to prevent further knocking. They actually act as "oxygen sensors" in the ignition timing feedback control loop.

The working principle of the knock sensor: when the engine vibrates or knocks the cylinder, the piezoelectric ceramic produces a voltage peak, and the greater the knock or vibration, the greater the peak. The engine control unit (ECU) processes the signals received by the detonation sensor, and if a detonation is determined, the ignition is postponed and the detonation continues.

When the engine control unit ECU does not receive the signal from the knock sensor, the ignition time is advanced to ensure the optimal output of the engine. Therefore, the purpose of using a knock sensor is to improve the dynamic performance of the engine without knocking.

Underneath that row of air intakes.

The position of the Hyundai Rena sensor is as follows: 1. Oxygen sensor: The oxygen sensor is installed on the exhaust pipe, which is used to monitor the combustion gas to judge whether the combustion of the engine is sufficient, and whether the mixing degree is too thin or too concentrated;

2. Wheel speed sensor: the wheel speed sensor is like a hand in the front wheel brake disc, it is mainly to collect the speed of the car to judge whether the car has signs of skidding, so there is a special sensor to collect the wheel speed of the car to complete this work, generally installed on the hub of each wheel, and once the sensor is damaged, ABS will fail;

3. Water temperature sensor: the water temperature sensor is installed next to the thermostat, converts the cooling water temperature into an electrical signal, increases the amount of fuel injection or increases the ignition advance angle when the temperature is low, and prevents deflagration at high temperature, and delays the ignition advance angle;

4. Intake fiber pressure sensor: generally installed on the side of the throttle, the intake pressure sensor, as the name suggests, is to induce a series of resistance and pressure changes with the different speed loads of the engine, and convert them into voltage signals for ECU to correct the amount of fuel injection and the ignition timing angle. If it fails, it will cause problems such as ignition difficulties, unstable idling, and weak acceleration.

Millions of car purchase subsidies.

The reason for the knocking is because the engine with a high compression ratio doesn't have the amount of fuel that it needs to octane, which is a problem that inevitably occurs.

Some car owners use the national standard 2 for a long time in order to save money The fuel of the national standard 2 is a few cents cheaper than the national standard 3

Or in some areas, shoddy ** low is also the owner of the picture cheap is also one of the reasons for the detonation.

If the engine is fueled according to the required minimum standards, there will be absolutely no knocking.

The compression ratio of Rena is:1 If conventional standards must be used with 95 and higher fuel grades.

Due to the need to adjust the domestic oil quality of the joint venture vehicle, reduce the fuel injection concentration, and reduce it to the minimum standard, which is No. 93 national standard 3 fuel.

Upgrading the ECU can only further reduce the concentration of fuel injection and reduce the probability of knocking, but if you continue to use low-grade fuel for a long time, knocking will still occur, and only improving oil quality is the most direct and effective way.

If you add No. 97 fuel, because of the high octane number, of course there will be no knocking problem, but your wallet will shrink.

1) Check whether the engine is obviously overheating, and if so, find out the cause first. (There are many related causes of engine overheating, pay attention to analysis).

2) Check if the engine knocks due to the failure of the ignition system.

If the ignition advance angle is too large, the mixture will burn too fast, resulting in engine knock combustion. The reasons for the ignition advance angle are as follows: the crankshaft position sensor is installed in the wrong position (or loose), the timing belt is installed in the wrong tooth, the operation program of the power control module is faulty, the air intake detected by the flow sensor in the air is too small, and the detonation sensor is slow to respond.

3) Check if the pressure in the fuel system is too low.

If the pressure of the fuel system is too low, causing the mixture to be too thin, the combustion rate of the mixture will decrease, and the heat transferred through the cylinder wall to the coolant after the mixture is burned will increase, resulting in a high engine temperature. The engine temperature is too high, which is prone to detonation and combustion.

4) Check if the fuel is contaminated.

The lower the designation (i.e., octane number) of gasoline, the less resistant the gasoline is to knock off, and the more susceptible the engine is to detonation combustion when using this gasoline as fuel. In addition, if impurities are added to the gasoline with a relatively high grade, it will also cause the anti-knock ability of the gasoline to decrease.

5) Check whether the engine knocks due to the failure of the engine cooling system.

The actual working temperature of the engine is determined by the heat generated by the combustion of the mixture per unit time and the heat emitted by the heat dissipation system, if the cooling system is faulty, the former will be greater than the latter, the temperature of the engine will be higher and higher, and the tendency to detonation and combustion will be greater and greater.

6) Check if the pressure of the cylinder is too much.

If the pressure of the cylinder is too high, the combustion rate of the mixture increases, and the likelihood of detonation combustion in the engine increases. The reason for the excessive pressure of the cylinder is that the cylinder head, piston or cylinder gasket model is not the same as the working volume of the cylinder and the cylinder pressure.

7) Check whether there is too much carbon deposits in the combustion chamber of the engine.

If a large amount of carbon deposits are accumulated in the cylinder, the hot spots formed by the carbon deposits may ignite the mixture in advance during the cylinder compression process, resulting in a sudden increase in the pressure in the cylinder during further compression, and detonation and combustion will occur. The causes of carbon deposition are as follows: the mixture is too concentrated, the ignition energy is relatively poor, the quality of gasoline is relatively poor, and the engine burns oil for some reason, etc., which can be checked separately.

8) Check if the EGR system is working properly.

If the exhaust gas recirculation system works within the working range, the system fails and cannot make the exhaust gas enter the cylinder to participate in the combustion, which will inevitably cause the combustion temperature of the mixture to rise, so that the engine will overheat and be prone to detonation combustion.

9) Check if the application and calorific value range of the spark plug are correct.

Detonation = high compression ratio + low grade fuel.

It's a bad thing to blame.

Causes of detonation.

It is because of the high compression ratio of the engine.

Failed to add the required octane fuel.

A problem that inevitably arises.

Some car owners want to save money.

The fuel of the GB 2 is a few cents cheaper than the GB 3.

Long-term use of national standard 2

or certain regions.

Shoddy. **Low.

It is also the owner of the car figure cheaper.

It is also one of the causes of the detonation.

If the engine is in accordance with the required minimum standards.

Use fuel. There will be absolutely no knocking.

The compression ratio of the Rena is:1

If by traditional standards.

Fuel grades 95 and higher must be used.

Due to the joint venture vehicle, the domestic oil quality needs to be adjusted in a targeted manner.

Reduced fuel injection concentration.

The minimum standard is No. 93 national standard 3 fuel.

Upgrading the ECU can only further reduce the concentration of fuel injection.

Reduces the chance of detonation.

However, if you continue to use low-grade fuel for a long time.

Knocking will also happen.

Only to improve the quality of the oil.

is the most direct and effective way.

If you add No. 97 fuel.

Because of the high octane number.

Of course, there will be no detonation problems.

But your wallet will shrink.

Oh, I remember that there were such posts two years ago, saying that the 2010 Rena detonation, the 2014 model of the car will not be detonation, and the ECU program will not be detonation after being re-modified, but today I saw your post, I was thinking about whether the 2014 Rena car friends were deceived by Beixian and made a joke, don't take it seriously... Then again, even if there is a detonation,