Valve Body Qualification

在撰写本文时，两党正在讨论财政悬崖。派对一点提出留下政治僵局，只是等待，看看我们走过边缘后会发生什么。这种观点与重新绘制了一座生锈的桥梁（图1）。

图1： 桥梁崩溃

第二方声称，有僵局的替代方案，可以避免悬崖。他们的观点是停止流量（即程序和权利），直到桥梁可以重新定义，这样他们就可以决定它是否应该被修复或更换。然后问了一个问题：我们是如何达到这一点的？

这种情况将我击中了与阀体服务的完美平行。抛开政治，让我们审查阀门身体测试的演变和当前资格实践的状态。虽然传统的视觉指示器如蠕动，偏转，手电筒和视觉钻孔磨损检查仍然有用，但我们将使用压力和真空进行此评论，并在使用阀体测试台上完成。

There are currently two procedures for air pressure testing: the unregulated air gun and a calibrated air test plate. The air gun test originated as a clutch air pressure test in传播手册在适用于阀体测试之前。具有空气测试的视觉泄漏是由过量的阀到孔或末端插头间隙引起的。在空中测试后，问题变为：泄漏正常或过度泄漏？通过/失败决策需要经验妥善制作，这类空中测试的损失。变量包括空气供应，空气尖端，推出商店的流体和噪音水平的时间长度。

Moving along the valve body testing timeline to another decade, we added fixtures to the air test to isolate circuits. Examples include modified EPC solenoids for the 4L60/80-E,5R55E那5R55Wor F5A, etc. Now a solenoid was modified and air directed to the EPC signal circuit while the unit was assembled. These were cost-effective methods and provided a visual indication of bore wear (图2Aand图2B.）。

图2A: 5R55E	图2B.: 5R55W Modified Solenoids

排列铸造的下一种细化是使用真空测试，一种从气缸盖中使用的阀门导向器/座椅测试中使用的技术。当该测试施加到阀到孔隙间隙时，会发生最小的真空下降。真空显然与压力测试相反。如果气压将流体和污染物推出孔，真空泵将把它拉入仪表和孔口。这意味着 - 为了获得真空测试时的最佳效果 - 大致重要的是，组装清洁干燥。进行常规校准以减少污染，并且还允许泵容量方差。与空中测试不同，铰链对Rebuilders的个人经验，真空测试仪表产生特定数据，以便更容易诊断学习曲线。

执行A.vacuum test，Rebuilder密封有板或焊盘的电路，在电路之间移动以测试各个区域。一旦清洁，可以检查整个铸件，以便阀门孔耐受性。其他优点包括从孔中拆下阀门，检查升压套筒磨损和电磁座椅等的条件（图3.）。

图3.: 真空测试组件	图4.: 空气测试板

A valve body air test plate also uses air pressure, but pressure and volume are precisely regulated. In this test an assembled valve body is bolted to a plate that has multiple feed ports to each bore. An air flow meter and a gauge (analog for visual or digital tied to a computer) record a psi drop and flow increase. Generally a new or acceptable assembly is tested and used as the baseline. The greater the variance from a known good measurement, the more clearance there is between the valve and bore. The instrumentation and regulators are used for all applications, but each type of valve body requires its own test plate (图4.）。There are a few big advantages to this type of testing. Pre-cleaning and the labor involved in fastening and recording gauge equipment is eliminated. The cost to repair also can be estimated and service noted before opening it.

图5： VBT图形

Next we come to the arrival of modern hydraulic valve body test stands or VBT’s. Hardware and software advancement has been rapid to duplicate clutch-to-clutch and skip shifting. The key to testing a 6-8 speed valve body or mechatronic unit is to command and record as if the Transmission Control Module (TCM) were running it. This requires extensive solenoid manipulation and data acquisition (图5.), specifically the transition or X pattern of multiple solenoids from exhaust to fill. In the vintage VBT and on/off valve bodies, only end-of–the-line clutch pressure was monitored. The operator could control throttle pressure via cable and monitor minimum and maximum pressure, using feel as time. The newer TCM’s, however, focus on time and flow rather than pressure (图6.）。今天的VBT可以在2分钟内测试螺线管输出并在2分钟内运行六速换档周期，没有操作员参与。

图6.	图7.

阀体测试台需要加入特定板，就像空中测试一样，但具有包括控制程序，线束和橱柜的益处。该设备的回报以体积和质量保证实现。RemanufactuRer理解VBT可降低Dyno或车辆的R-R和返工。

This brings us to the current state of transmissions, in which linear solenoids (图7.)现在的框架clutch-to-clutch转变s. They receive a TCM output and convert it to a variable pressure. Due to heat, wear and contamination, the coil reaction and pressure degrade, forcing the TCM to adjust or adapt. Unlike a Federal budget, though, TCM adaptation is not unlimited – it will set a code to stop things from going over the proverbial cliff – but because these solenoids are no longer on/off, they cannot be qualified with old diagnostic methods like air or fixed oil pressure. Similar to the valve body or mechatronic unit, they require testing in a severe environment that includes heat, pressure and cycle time.

Bob Warnke是一个Sonnax V.P.技术发展与成员TascForce®.（技术汽车专业委员会），一批认可的行业技术专家，传输Rebuilders和Sonnax Industries，Inc。，技术人员。