"Oil oil increase" is actually a "hundred-year-old disease": In the SAE (note: "SAE International Society of International Automatic Machine Engineers", originally translated as: American Society of Automotive Engineers) technology library, you can search for the discussion papers first appeared in the Almost 100 years ago! And it still plagues consumers and engine manufacturers today.

The oil problem plaguing the entire new generation of CR-V owners also deepened with the investigation. Dongfeng Honda invested a lot of time and resources and repeatedly verified the feasibility of the recall plan. Eventually Dongfeng Honda Automobile Co., Ltd. decided to initiate a recall. From May 22, 2018, some 2018 CR-Vs equipped with 1.5T engines, which were produced from February 14, 2017 to February 27, 2018, were recalled for a total of 130,455 vehicles.

For some vehicles in this recall range, due to design reasons, when the vehicle is continuously traveling at a short distance in a low-temperature environment, the ECU program will perform a greater amount of fuel injection by default to make the engine enter the optimal operating state as soon as possible, making more unburned. The fuel enters the crankcase. This is also the main reason for the increase in engine oil of the Dongfeng Honda CR-V 1.5T model.

When the oil level rises to a certain level, the engine failure indicator will light up. If the vehicle is continuously operated under this condition, the engine may be damaged and there is a safety hazard. Dongfeng Honda finally decided to replace the air-conditioning control unit and upgrade the FI-ECU software for free by recalling the vehicle. At the same time, the model of the CVT gearbox was replaced with the radiator water pipe assembly and the TCU software was upgraded to effectively suppress the increase of the oil level. To eliminate security risks.

solution

1, replace the air conditioning control unit and radiator water pipe assembly

The technical solution provided by Dongfeng Honda is clearer and clearer for the phenomenon of increased oil level in CR-V 1.5T models. The first is to replace the air-conditioning control unit and the radiator water pipe assembly for the recall of vehicles for free.

As the temperature of the oil heats up and the warming up of the air conditioning system in the car, a heat source is shared - the heat released by the combustion of the fuel mixture. Air-conditioning heating systems share more heat, and the temperature inside the car rises faster in the winter, and the corresponding engine's share of heat is less, and the oil and water temperatures reach normal temperatures. The replacement of the air conditioning control unit is also intended to allow the oil and water temperature to reach normal temperatures.

The replacement of the radiator water pipe assembly is mainly to change the internal logic of the thermostat or the control logic of the valve body, which is more conducive to the CR-V locking the heat in the winter cold state, allowing the engine to warm up faster.

2. Upgrade FI-ECU

Upgrade the FI-ECU software to upgrade the fuel injection strategy to achieve higher fuel injection pressure at low temperatures, optimize the timing of injection and ignition, promote full combustion of the mixture, and reduce the occurrence of fuel wetwall conditions. In simple terms, a higher fuel injection pressure can promote more complete combustion of the mixture and reduce the “intake” of fuel oil in the engine oil. As a means to solve the increase in oil level at the source.

The CR-V uses a side-mounted injection method, so it is important to modify the fuel injection timing. It determines whether the fuel is sprayed on the cylinder wall or on the top of the piston. Fuel is sprayed on the cylinder wall, and it is easier to get through the piston ring and into the crankcase. Fuel oil is fused into the oil, which leads to an increase in oil.

The upgrade of FI-ECU can also be achieved by changing the engine's start-up speed in winter. For example, the higher the engine speed, the more heat is released from the fuel mixture in the cylinder. The warm-up speed is up, and the gasoline is mixed in the oil. Water vapor can evaporate as soon as possible and enter the combustion chamber again, thus alleviating the increase in oil.

In addition, Dongfeng Honda will also upgrade the TCU on the CVT gearbox version of the CR-V. By changing the shift logic of the transmission, the engine is kept at a relatively high speed in the cold state, so as to speed up the warm-up and improve the increase of oil. This is also a reliable solution.

In general, there are not many parts to be replaced, and the main thing is to adjust and upgrade the ECU and TCU software. The purpose is to make the engine warm up quickly in cold winter, so that the oil can reach the normal working temperature.

after-sale warranty:

1. Providing life-long repair service for the main engine parts

In addition, Dongfeng Honda will provide life-long repair services for the main components of the vehicle engine within the scope of the recall in order to allow the owners of friends to use their car with ease. The main components include crankshafts, main bearings, connecting rods, connecting rod bearings, pistons, piston rings, piston pins, cylinder heads, camshafts, valves, and cylinder blocks. In the implementation of the recall, Dongfeng Honda will entrust Dongfeng Honda Automobile's special sales service shop with the owner to sign the “Dongfeng Honda Automobile Engine Extension Repair Service Certificate”.

2. As a result of damage to the engine, Dongfeng Honda will replace the engine assembly for the owner vehicle for free.

During the vehicle owner's car use, if the engine oil level increases to a certain extent, the engine fault indicator will light up and cause the engine to appear crankshaft damage, oil pump damage, piston cylinder liner wear, camshaft damage and other faults, Dongfeng Honda will be free for the owner vehicle Replace the engine assembly.

Always adhere to the user first

Looking back at the overall picture of the incident, after receiving complaints from the owner, Dongfeng Honda immediately established an investigation team and immediately held a media communication meeting to make an official response to the oil problem. At the same time, experts were dispatched to the Northeast for investigation. It can be seen that Dongfeng Honda has always put the "customer first" service concept into practice.

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Dongfeng Honda's timely investigation and active communication with users and the media also reflected the responsibility and responsibility of a company. Now no matter whether it is manufacturers or consumers, it is unnecessary to talk about the recall. The manufacturer's announcement of the recall is a responsible performance. This is fortunate for CR-V owners. I believe that through this recall, Dongfeng Honda can properly solve this problem of increased oil level, giving consumers a satisfactory answer.