Crosstalk modeling for automotive harnesses

Automotive wiring harnesses are used to transmit a wide variety of signals which range from low level control signals to high current signals for DC motors. Crosstalk on the cable harnesses is a potential problem for these typically tightly-packed cable bundles. Accurate computer modeling of the crosstalk allows for identification of potential crosstalk problems early in the design process. Decreased harness design time can be achieved by reducing the number of prototype harnesses constructed and the corresponding empirical testing. This translates into a direct cost savings for a given harness design. In this study, crosstalk modeling for an automotive wiring harness is evaluated. In general, harness data exist within a CAE/CAD vehicle layout tool. Information is usually not available, however, for the distribution of wires within a cross section of the harness. Assumptions then have to be made concerning the distribution of wires within a harness cross section. The assumptions made during this study are outlined and their impact on the predictions is evaluated. Computed results are presented and are compared to experimental data from prototype harnesses