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SINOTRUCK HOWO TRUCK SPARE PARTS WIECHAI WP12 WP13 Engine In-Cylinder Brake Solenoid Valve 612630190017
FUNCTION
1. Enables Engine Auxiliary Braking (Compression-Release Braking): When the vehicle is descending a long slope, requires rapid deceleration, or necessitates emergency braking, the system utilizes controlled oil pressure to actuate in-cylinder brake valves. This briefly opens the exhaust valves, allowing compressed air to be released at the end of the piston's compression stroke, thereby generating substantial braking torque.
2. Reduces Load on the Primary Braking System: Effectively minimizes wear on brake pads and drums, extends the service life of the braking system, and enhances overall driving safety.
3. Enhances Downhill Safety: Particularly beneficial for heavy-duty trucks and vehicles navigating mountainous terrain, this system helps maintain a stable vehicle speed and prevents brake fade caused by frequent application of the service brakes.
Operating Principle
1. ECU Signal Control: Based on driver inputs (such as brake switch activation, gear selection, vehicle speed, etc.), the vehicle's ECU transmits a 24V electrical signal to the solenoid valve.
2. Solenoid Actuation: Upon receiving power, the solenoid valve's coil generates a magnetic force that opens the internal spool, allowing high-pressure engine oil to flow into the brake piston chamber of the exhaust rocker arm.
3. Braking Execution: The high-pressure oil drives the brake plunger, which in turn forces open the exhaust valve; this releases the compressed air within the cylinder, thereby generating a retarding braking force.
4. Power-off Reset: When the signal is interrupted, the solenoid valve closes the oil passage, braking ceases, and the engine resumes its normal operating mode.
Advantages
| No. | Performance Advantage | Detailed Description |
|---|---|---|
| 1 | Fast Response & Precise Control | Response time < 25 milliseconds. ECU precisely controls and flexibly adjusts braking intensity according to vehicle speed, gear, and brake signals. |
| 2 | Powerful Braking Performance | Adopts Jacobs compression release braking principle, delivers high braking torque, effectively assists main brakes and significantly reduces brake fade risk. |
| 3 | High Durability & Reliability | Aluminum alloy housing + waterproof connector, resistant to high temperature, high-pressure oil, and vibration. Service life can reach hundreds of thousands of kilometers. |
| 4 | Energy Saving & Wear Reduction | Reduces wear on main brake pads/drums by more than 30%, extends brake system life, lowers maintenance costs and fuel consumption. |
Installation Location:
Rear right side of the engine cylinder head (viewed from the cab-typically the rear section of the engine, near the flywheel end), situated close to the camshaft housing / rocker arm chamber area.
DETAILS
| DESCRIPTION | In-Cylinder Brake Solenoid Valve | PART NUMBER | 612630190017 |
| WEIGHT |
0.8KG |
VOLUME |
9cm × 5cm × 7.5cm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
Daily Maintenance Suggestions
It is recommended to perform an inspection every 5,000–10,000 kilometers or during every Level 2 maintenance service.
Key Maintenance Procedures:
Visually inspect the solenoid valve and wiring harness for any oil contamination, damage, looseness, or corrosion.
Verify that the electrical connectors are securely seated and that the waterproof seals are intact.
Ensure that all associated oil lines are free of leaks, and confirm that the engine oil level and quality are within normal limits (use Weichai-specified engine oil).
Preventive Measures: Keep the engine compartment clean to prevent the solenoid valve from being exposed to prolonged immersion in water or oil; regularly replace the engine oil filter to prevent impurities from entering the high-pressure oil circuit and causing the valve spool to jam.
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