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The suspension system is the system most closely related to the platform product derivation strategy among the four chassis systems. The following will take the suspension system solution selection and derivation strategy as an example in detail.

The suspension system is divided into front suspension system and rear suspension system according to the location. The front suspension system mainly has McPherson and double wishbone structures; the rear suspension system has semi-independent and independent structures, and each of the same system structures has different structural forms. The platform suspension system selection is to determine the system architecture and structural form according to the platform attribute requirements.

First, use the market benchmarking big data method to determine the choice of platform suspension system architecture. Classify and analyze the suspension system architecture of the mainstream models in the market corresponding to the platform planning models. At present, the mainstream structural form of the front suspension system of a transverse front-wheel drive passenger car is mainly MacPherson, and the mainstream structural form of the rear suspension system includes two types: torsion beam and multi-link.

The structures that make up the same system architecture come in a variety of forms. How to choose different structural forms for the same system architecture? Taking the selection of the multi-link independent rear suspension structure as an example, the multi-link rear suspension system can be divided into a well-shaped frame and an I-shaped frame according to the structural form of the sub-frame, as shown in Figure 2-12. The well-shaped frame has the characteristics of high rigidity and is compatible with four-wheel drive layout, while the I-shaped frame has the advantages of compact layout, light weight and low cost. Therefore, the selection of the structural scheme of the platform rear suspension system needs to balance the dimensions of cost, performance, weight, scalability, and four-wheel drive versatility, so as to achieve the target of platform product attributes, and determine the structural form and strategy as a whole, as shown in Figure 2-12c.

Figure 2-12 Schematic diagram of chassis rear suspension system option selection

2.3.2.2 Derivative strategy of chassis system

Taking the suspension system as an example, the suspension system derivation strategy is developed around the platform attribute target, and the focus is on the derivation of the grid size of the model that needs to match the platform planning. By solidifying the interface and adjusting some parts, it can meet the requirements of the whole vehicle product for the size change of length, width and height.

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