Analysis of technical highlights of Dongfeng Honda Siborui

Dongfeng Honda’s Spurui sedan was launched in China in September 2009 and is positioned as a high-end sports B-class sedan. It uses the same platform as the Acura TSX, but it does not use the 2.4 L 148 kW engine of its prototype Acura TSX. Instead, it is equipped with a 2.4 L i-VTEC (intelligent variable valve timing) that is closer to the GAC Honda Accord sedan. and valve lift system) engine. The distinguishing feature of the configuration of Sibo Rui is the use of a dynamic adaptive EPS system that coordinates the control of the electronic power steering EPS and the anti-skid device VSA. In addition, some models are also equipped with a hard drive HDD navigation system and a Honda smart key system. Comfort is further improved. In terms of braking, the car uses a ventilated disc brake system at the front and a solid disc at the rear. In order to make it easier for readers to understand the car, this article will introduce some of the main technical highlights of Sibo Rui.

1. Engine figure 1

The 2.4L engine equipped with Sibo Rui adopts i-VTEC technology, with a maximum output power of 133 kW and a maximum output torque of 225 N?m (Figure 1). Moreover, the intake manifold of this engine is made of resin material, which is beneficial to reducing the vehicle’s curb weight.

1. Working principle of i-VTEC

The following introduces the working principle of i-VTEC of the 2.4L engine.

When the engine is under low load and low speed, the two intake valves work under the cam drive with a small valve lifting stroke. When the engine is under high load and high speed, the hydraulic VTEC actuates the piston and connects the three rocker arms on the intake side, and the two intake valves are driven by a cam with a large valve lifting stroke.

figure 2

The intake side rocker arm of the Sibo Rui 2.4L engine is made of high-strength aluminum, which helps reduce the weight of the engine. It should be noted that when maintenance personnel maintain the rocker arms, they must add gaskets between the rocker arms (Figure 2), otherwise the aluminum products will rub against each other and cause damage. Additionally, the bushing is press-fitted and cannot be replaced or re-pressed.

2. Crankshaft position sensor (CKP) image 3

In order to improve the detection accuracy of the crankshaft position, the CKP pulse plate and CKP sensor of the SPIRI 2.4L engine are set on the transmission side, which can reduce the influence of the crankshaft torsional vibration on the crankshaft positioning pulse plate. The detection interval of crankshaft pulses is 6° (Fig. 3), which enables more precise detection and improves the accuracy of misfire detection.

3.MAF sensor (air flow meter)

Sibo Rui’s engine uses a MAF sensor, which measures the amount of directly inhaled air to achieve high-precision fuel injection, thereby improving the control accuracy of the air-fuel ratio. In addition, the IAT (intake air temperature) sensor and MAF sensor are integrated.

4. Fuel injector Figure 4

The SPIRI 2.4L engine uses a 12-hole fuel injector (Figure 4), which can improve the atomization of the injected fuel, effectively improve the engine’s power output, and reduce emissions.

5. Exhaust system Figure 5

The Sibo Rui 2.4L engine adopts a dual-stage three-way catalytic converter design with a rapid warm-up three-way catalytic converter and a three-way catalytic converter under the car body (Figure 5). The metal content of the catalyst is reduced and the heat resistance of the catalyst is improved, so the engine can heat up faster after starting and reduce emissions faster. In addition, the engine adopts a cylinder head with a built-in exhaust manifold, which achieves low vehicle emissions through lightweight compactness and the rapid onset of action of the three-way catalytic converter after the engine is started.

2. Automatic transmission

The Sibo Rui 2.4L engine is equipped with a 5-speed automatic transmission. The following is a brief introduction to the technical characteristics of the transmission.

1. Lock-up clutch Figure 6

The lock-up clutch uses a diaphragm spring to reduce the ineffective stroke and make the engagement faster. This realizes the high-speed response performance of the lock-up clutch and helps reduce the fuel consumption of the vehicle; it adopts FAS [FCC Advanced Segment (FCC Advanced Platform)] system French clutch plate (Figure 6), this kind of clutch plate is not easy to fluff, so it effectively reduces wear.

2. Paddle shifters

The five models released by Sibo Rui are all equipped with paddle shifters, which fully reflect the characteristics of a sports car. By turning the paddle shifters, the vehicle can be upshifted or downshifted.

Sibo Rui can shift gears in both D and S gears by operating the shift paddles. When the vehicle is in D gear, turn the shift paddle, and the instrument will display the number of gears. When the shift paddle is not operated to maintain cruising, etc., it will automatically return to the automatic transmission mode; when the vehicle is in S gear, turn the shift paddle. When you press the shift paddles, the instrument will display the gear number and “M”. At this time, the shift paddles can only realize manual shifting. If the gear selector does not return to the D position, the vehicle will not return to the automatic shifting mode.

Figure 7

When using the shift paddles in D gear, the principle of the vehicle automatically returning from manual transmission mode to automatic transmission mode is as shown in (Figure 7). The PCM determines the driving state (cruising state, parking state, and acceleration state) based on the changes in vehicle speed and throttle opening, and returns to the automatic transmission mode when the predetermined conditions are met.

3. Shift Hold Control (Shift Hold Control)

The so-called shift hold control means that when the vehicle is driving in D gear, the PCM determines that the vehicle has entered a turning section based on signals such as the steering wheel angle, throttle opening, and vehicle speed, and uses shift hold control to prevent unnecessary upshifts and downshifts during the turn. , improve the driving stability of the vehicle when turning. In addition, through the newly added turning G shift control, the speed difference between the two rear wheels of the vehicle can be detected, further improving the accuracy of turning judgment.

3. Steering system
4. Electronic power steering system (EPS)

Compared with the hydraulic power steering system, the electronic power steering system EPS achieves briskness at low speeds and stability at high speeds through electronic control, and has less power loss, which is beneficial to reducing fuel consumption.

(1) Inclination and telescopicity

Figure 8

The steering column of the electronic power steering system can adjust the tilt and telescopic degree (Figure 8). The locking lever for adjusting the tilt and telescopic degree is a press-in locking type. This is to prevent the locking lever from causing damage to the driver in the event of a vehicle collision. harm.

(2) Three-phase brushless AC motor

Figure 9

The structure of the EPS motor is a three-phase brushless AC type, which is coaxial with the steering gear (Figure 9). The three-phase brushless AC EPS motor consists of an armature coil wound with copper wire, a rotor with permanent magnets, and a resolver (angle sensor) that detects the position of the rotor. The resolver detects the three-phase (U-V-W) energization pattern of the armature coil and controls the EPS motor. What maintenance personnel need to note here is that the power plug of the EPS is independent on the outside, so be careful not to damage it when disassembling and assembling it.

2. Dynamic adaptive EPS

Sibo Rui adopts a dynamic adaptive EPS system. The so-called dynamic adaptive EPS refers to a system that integrates and coordinates the control of VSA (anti-skid device) and EPS (electronic power steering). This system can correct and supplement the steering assist torque to help the driver stabilize the steering when the vehicle is prone to losing control when turning on slippery roads.

This control is achieved by coordinating the VSA system composed of yaw rate (lateral acceleration) sensor, steering angle sensor, wheel speed sensor and PCM, and the EPS system composed of torque sensor and PCM. In addition, in terms of assist torque control, smooth and coordinated steering assistance is achieved by directly using the signal from the yaw rate sensor.

The working principle of dynamic adaptive EPS is as follows.

When a steering loss occurs (such as when turning on a slippery road), the average driver will increase the steering wheel angle in an attempt to return to the desired route. However, excessive steering wheel rotation angle will aggravate the directional loss of control. When oversteer is detected, the dynamic adaptive EPS system will increase the steering torque required by the steering wheel when the driver attempts to increase the angle of the steering wheel, thus indicating that the driver is about to lose steering control and hinder driving. or over-rotating the steering wheel. At this time, when the driver turns the steering wheel in the opposite direction, that is, in the opposite direction to oversteer, the system will “lighten” the steering wheel to assist the driver to complete the operation smoothly. In addition, VSA will control the engine’s output torque and braking system in a timely manner to stabilize the vehicle.

When driving in cold areas, sometimes one tire will come into contact with the icy road. When braking in this case, because the tire adhesion on the side in contact with the icy road is smaller, the vehicle will deflect toward the dry road and lose control. At this time, the VSA system will activate the ABS system to prevent the wheels from locking. At the same time, the dynamic adaptive EPS will “lighten” the steering wheel operation that is beneficial to maintaining the straight direction, assist the driver in correcting the steering operation, and cooperate with the VSA system to stabilize the vehicle. .

It should be noted that dynamic adaptive EPS does not work when the VSA switch is turned off or the VSA system fails.

4. Braking system

The front wheel brake of Sibo Rui uses a 16-inch radiator brake disc, and the rear wheel brake uses a 15-inch solid brake disc.

1. Brake booster

Figure 10

The brake booster uses through-type bolts (Figure 10), which can suppress deformation during forced braking and improve the braking feel.

2.Rear brake caliper

The rear brake caliper and parking brake system of Sibo Rui have been redesigned. Through the rotation of the shaft connected to the brake lever, the two cam discs (balls are sandwiched between the two cam discs) are driven to rotate. Through the shaft extrusion Press the piston to produce braking force. Repairers should note here that because it is a new design, the warranty parts that can replace the rear brake caliper have also changed.

3. Parking brake lever

The parking brake lever adopts a connected pull rod, with a cable at the middle connection part of the pull rod. In this way, the parking brake lever becomes smaller and the space in the central storage box becomes larger.

5. Navigation system
6. Navigation self-diagnosis

The navigation system has a self-diagnosis function. The specific operations are as follows.

Press and hold the three buttons “current location”, “destination” and “return” at the same time, and the comprehensive information display will display the self-diagnosis menu screen. Select “Diagnosis Menu” on the self-diagnosis menu screen, enter the diagnostic menu and then select “System Connection Diagnosis”. The system connection confirmation result will be displayed. In addition, the system can also perform operations such as sensor information confirmation, complete clearing of NAVI information, guided mode driving settings, SC recording blocking settings, and rear camera guidance adjustment.

By selecting “Unit Diagnosis” on the diagnostic menu screen, you can confirm the detailed diagnosis results of the navigation control unit, monitor, rear camera, hands-free (HFT), navigation button and audio button.

2. Parking sensor

There are 4 parking sensors installed on the front and rear bumpers of the vehicle. As soon as the vehicle approaches an obstacle, the buzzer will alarm and the perceived position will be displayed on the comprehensive information display. Depending on the perceived distance, the buzzer will The chirping speed (frequency) will have 3 different changes.

The working conditions of the parking sensor are as follows.

①Turn on the parking sensor switch.

② It starts working when the vehicle speed is below 8 km/h and stops working when the vehicle speed is above 15 km/h.

③When moving forward, only obstacles in front will be sensed.

④When moving backward, only the rear sensor and the front corner sensor sense.

Maintenance personnel should pay attention during maintenance. When the parking sensor fails, the words “Check System” and the fault location will be displayed on the comprehensive information display screen, and the location of the failed sensor will continue to light up. Except for the faulty sensor, all other sensors will work normally. If a certain part of the sensor is contaminated by ice, snow, mud, etc., a temporary fault message will appear. As long as the dirt is removed, the fault display will disappear.

6. Intelligent key system

Some models of SPIRIUS adopt the Honda smart key system, which allows the driver to lock/unlock the doors, unlock the luggage compartment, and start/stop the engine by simply carrying the Honda smart key without inserting or operating the key. .

1.Smart key structure

Figure 11

The Honda smart key is divided into two parts: the Honda smart key body and the anti-theft key (Figure 11). When the Honda smart key system is not working, the engine can also be started using the anti-theft key. Remove the ignition switch knob and cap, insert the anti-theft key into the ignition lock cylinder, and turn the key to start the engine.

2. Scope of action

The scope of the Honda smart key system is that the door handles on the driver’s side, front passenger’s side and the luggage compartment lid outer handle extend to an area surrounded by about 80 cm. Even within range, sometimes the Honda Smart Key won’t work if it’s too close to the ground or too high.

When the Honda smart key system electronically compares the vehicle and the key, there will be weak radio waves and it is susceptible to interference. Therefore, when performing fault diagnosis on the smart key system, maintenance personnel should consider the following situations that may cause the system to work abnormally or become unstable.

① When there is a strong radio wave transmitting device nearby.

② When mobile phones, walkie-talkies and other communication devices, laptop computers and other items are placed together with the Honda smart key.

③When the Honda smart key comes into contact with metal objects.

④ Even if the Honda smart key is placed outside the car, if it is placed very close to the window or body, the engine can still be started; even if the smart key is inside the car, if it is placed in the glove box or door pocket , the engine may not start.